# `FFix.Muxer`
[🔗](https://github.com/akash-akya/ffix/blob/v0.2.0/lib/ffix/muxer.ex#L1)

Package output streams into a file or streaming format.

A muxer writes the container. Choose encoding separately with `FFix.Encoder`,
or keep the existing encoded streams with `FFix.stream_copy/1`.

## MP4 for download and playback

    alias FFix.{Encoder, Muxer}
    source = FFix.input("interview.mov")

    output =
      Muxer.mp4(
        [Encoder.libx264(FFix.video(source, 0)), Encoder.aac(FFix.audio(source, 0))],
        "interview.mp4",
        movflags: [:faststart],
        output_options: [t: 30]
      )

    FFix.command(output)

`movflags` configures the MP4 muxer. `output_options: [t: 30]` limits the output
to 30 seconds. Keeping those option lists separate makes their scope clear.
See `FFix.Command` for general FFmpeg option syntax.

A named helper selects its format regardless of the filename. Use
`FFix.output/3` when FFmpeg should choose the format from the target instead.
`new/2` provides a standalone muxer configuration and `mux/4` accepts other
FFmpeg format names.

## Segments and playlists

One output declaration can write a set of files. This creates an HLS playlist
and its media segments:

    source = FFix.input("interview.mp4")
    video = FFix.Encoder.libx264(FFix.video(source, 0), b: "2M")
    audio = FFix.Encoder.aac(FFix.audio(source, 0), b: "128k")

    output = FFix.Muxer.hls([video, audio], "hls/index.m3u8", hls_time: 4)
    FFix.command(output)

Create the `hls` directory before running the command. HLS segments normally
start at keyframes, so `hls_time` is a target duration. For multiple renditions
sharing audio, see the named-mapping example in `FFix.Command.Output`.

Helpers document options from the recorded FFmpeg reference. Use `raw:` for
newer option names, as described in `FFix.Encoder`. Available formats and codec
compatibility depend on the FFmpeg build and destination container.

See the [FFmpeg format reference](https://ffmpeg.org/ffmpeg-formats.html) for
muxer options and format-specific requirements.

# `hls_option`

```elixir
@type hls_option() ::
  {:avioflags,
   integer()
   | String.t()
   | [String.t() | :direct]
   | :direct
   | FFix.Command.option_callback()}
  | {:avoid_negative_ts,
     integer()
     | String.t()
     | :auto
     | :disabled
     | :make_non_negative
     | :make_zero
     | FFix.Command.option_callback()}
  | {:cc_stream_map, String.t() | atom() | FFix.Command.option_callback()}
  | {:fflags,
     integer()
     | String.t()
     | [
         String.t()
         | :flush_packets
         | :ignidx
         | :genpts
         | :nofillin
         | :noparse
         | :igndts
         | :discardcorrupt
         | :sortdts
         | :fastseek
         | :nobuffer
         | :bitexact
         | :shortest
         | :autobsf
       ]
     | :flush_packets
     | :ignidx
     | :genpts
     | :nofillin
     | :noparse
     | :igndts
     | :discardcorrupt
     | :sortdts
     | :fastseek
     | :nobuffer
     | :bitexact
     | :shortest
     | :autobsf
     | FFix.Command.option_callback()}
  | {:flush_packets, integer() | String.t() | FFix.Command.option_callback()}
  | {:headers, String.t() | atom() | FFix.Command.option_callback()}
  | {:hls_allow_cache, integer() | String.t() | FFix.Command.option_callback()}
  | {:hls_base_url, String.t() | atom() | FFix.Command.option_callback()}
  | {:hls_delete_threshold,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:hls_enc, boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:hls_enc_iv, String.t() | atom() | FFix.Command.option_callback()}
  | {:hls_enc_key, String.t() | atom() | FFix.Command.option_callback()}
  | {:hls_enc_key_url, String.t() | atom() | FFix.Command.option_callback()}
  | {:hls_flags,
     integer()
     | String.t()
     | [
         String.t()
         | :single_file
         | :temp_file
         | :delete_segments
         | :round_durations
         | :discont_start
         | :omit_endlist
         | :split_by_time
         | :append_list
         | :program_date_time
         | :second_level_segment_index
         | :second_level_segment_duration
         | :second_level_segment_size
         | :periodic_rekey
         | :independent_segments
         | :iframes_only
       ]
     | :single_file
     | :temp_file
     | :delete_segments
     | :round_durations
     | :discont_start
     | :omit_endlist
     | :split_by_time
     | :append_list
     | :program_date_time
     | :second_level_segment_index
     | :second_level_segment_duration
     | :second_level_segment_size
     | :periodic_rekey
     | :independent_segments
     | :iframes_only
     | FFix.Command.option_callback()}
  | {:hls_fmp4_init_filename,
     String.t() | atom() | FFix.Command.option_callback()}
  | {:hls_fmp4_init_resend,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:hls_init_time, number() | String.t() | FFix.Command.option_callback()}
  | {:hls_key_info_file, String.t() | atom() | FFix.Command.option_callback()}
  | {:hls_list_size, integer() | String.t() | FFix.Command.option_callback()}
  | {:hls_playlist_type,
     integer() | String.t() | :event | :vod | FFix.Command.option_callback()}
  | {:hls_segment_filename,
     String.t() | atom() | FFix.Command.option_callback()}
  | {:hls_segment_options, String.t() | atom() | FFix.Command.option_callback()}
  | {:hls_segment_size, integer() | String.t() | FFix.Command.option_callback()}
  | {:hls_segment_type,
     integer() | String.t() | :mpegts | :fmp4 | FFix.Command.option_callback()}
  | {:hls_start_number_source,
     integer()
     | String.t()
     | :generic
     | :epoch
     | :epoch_us
     | :datetime
     | FFix.Command.option_callback()}
  | {:hls_subtitle_path, String.t() | atom() | FFix.Command.option_callback()}
  | {:hls_time, number() | String.t() | FFix.Command.option_callback()}
  | {:hls_vtt_options, String.t() | atom() | FFix.Command.option_callback()}
  | {:http_persistent,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:http_user_agent, String.t() | atom() | FFix.Command.option_callback()}
  | {:ignore_io_errors,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:master_pl_name, String.t() | atom() | FFix.Command.option_callback()}
  | {:master_pl_publish_rate,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:max_delay, integer() | String.t() | FFix.Command.option_callback()}
  | {:method, String.t() | atom() | FFix.Command.option_callback()}
  | {:start_number, integer() | String.t() | FFix.Command.option_callback()}
  | {:strftime, boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:strftime_mkdir,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:timeout, number() | String.t() | FFix.Command.option_callback()}
  | {:var_stream_map, String.t() | atom() | FFix.Command.option_callback()}
  | {:raw, [FFix.Command.output_av_option()]}
  | {:output_options, [FFix.Command.option()]}
```

# `image2_option`

```elixir
@type image2_option() ::
  {:atomic_writing,
   boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:avioflags,
     integer()
     | String.t()
     | [String.t() | :direct]
     | :direct
     | FFix.Command.option_callback()}
  | {:avoid_negative_ts,
     integer()
     | String.t()
     | :auto
     | :disabled
     | :make_non_negative
     | :make_zero
     | FFix.Command.option_callback()}
  | {:fflags,
     integer()
     | String.t()
     | [
         String.t()
         | :flush_packets
         | :ignidx
         | :genpts
         | :nofillin
         | :noparse
         | :igndts
         | :discardcorrupt
         | :sortdts
         | :fastseek
         | :nobuffer
         | :bitexact
         | :shortest
         | :autobsf
       ]
     | :flush_packets
     | :ignidx
     | :genpts
     | :nofillin
     | :noparse
     | :igndts
     | :discardcorrupt
     | :sortdts
     | :fastseek
     | :nobuffer
     | :bitexact
     | :shortest
     | :autobsf
     | FFix.Command.option_callback()}
  | {:flush_packets, integer() | String.t() | FFix.Command.option_callback()}
  | {:frame_pts,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:max_delay, integer() | String.t() | FFix.Command.option_callback()}
  | {:protocol_opts, String.t() | atom() | FFix.Command.option_callback()}
  | {:start_number, integer() | String.t() | FFix.Command.option_callback()}
  | {:strftime, boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:update, boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:raw, [FFix.Command.output_av_option()]}
  | {:output_options, [FFix.Command.option()]}
```

# `matroska_option`

```elixir
@type matroska_option() ::
  {:allow_raw_vfw,
   boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:avioflags,
     integer()
     | String.t()
     | [String.t() | :direct]
     | :direct
     | FFix.Command.option_callback()}
  | {:avoid_negative_ts,
     integer()
     | String.t()
     | :auto
     | :disabled
     | :make_non_negative
     | :make_zero
     | FFix.Command.option_callback()}
  | {:cluster_size_limit,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:cluster_time_limit,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:cues_to_front,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:dash, boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:dash_track_number,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:default_mode,
     integer()
     | String.t()
     | :infer
     | :infer_no_subs
     | :passthrough
     | FFix.Command.option_callback()}
  | {:fflags,
     integer()
     | String.t()
     | [
         String.t()
         | :flush_packets
         | :ignidx
         | :genpts
         | :nofillin
         | :noparse
         | :igndts
         | :discardcorrupt
         | :sortdts
         | :fastseek
         | :nobuffer
         | :bitexact
         | :shortest
         | :autobsf
       ]
     | :flush_packets
     | :ignidx
     | :genpts
     | :nofillin
     | :noparse
     | :igndts
     | :discardcorrupt
     | :sortdts
     | :fastseek
     | :nobuffer
     | :bitexact
     | :shortest
     | :autobsf
     | FFix.Command.option_callback()}
  | {:flipped_raw_rgb,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:flush_packets, integer() | String.t() | FFix.Command.option_callback()}
  | {:live, boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:max_delay, integer() | String.t() | FFix.Command.option_callback()}
  | {:reserve_index_space,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:write_crc32,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:raw, [FFix.Command.output_av_option()]}
  | {:output_options, [FFix.Command.option()]}
```

# `mov_option`

```elixir
@type mov_option() ::
  {:avioflags,
   integer()
   | String.t()
   | [String.t() | :direct]
   | :direct
   | FFix.Command.option_callback()}
  | {:avoid_negative_ts,
     integer()
     | String.t()
     | :auto
     | :disabled
     | :make_non_negative
     | :make_zero
     | FFix.Command.option_callback()}
  | {:brand, String.t() | atom() | FFix.Command.option_callback()}
  | {:empty_hdlr_name,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:encryption_key, String.t() | atom() | FFix.Command.option_callback()}
  | {:encryption_kid, String.t() | atom() | FFix.Command.option_callback()}
  | {:encryption_scheme, String.t() | atom() | FFix.Command.option_callback()}
  | {:fflags,
     integer()
     | String.t()
     | [
         String.t()
         | :flush_packets
         | :ignidx
         | :genpts
         | :nofillin
         | :noparse
         | :igndts
         | :discardcorrupt
         | :sortdts
         | :fastseek
         | :nobuffer
         | :bitexact
         | :shortest
         | :autobsf
       ]
     | :flush_packets
     | :ignidx
     | :genpts
     | :nofillin
     | :noparse
     | :igndts
     | :discardcorrupt
     | :sortdts
     | :fastseek
     | :nobuffer
     | :bitexact
     | :shortest
     | :autobsf
     | FFix.Command.option_callback()}
  | {:flush_packets, integer() | String.t() | FFix.Command.option_callback()}
  | {:frag_duration, integer() | String.t() | FFix.Command.option_callback()}
  | {:frag_interleave, integer() | String.t() | FFix.Command.option_callback()}
  | {:frag_size, integer() | String.t() | FFix.Command.option_callback()}
  | {:fragment_index, integer() | String.t() | FFix.Command.option_callback()}
  | {:iods_audio_profile,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:iods_video_profile,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:ism_lookahead, integer() | String.t() | FFix.Command.option_callback()}
  | {:max_delay, integer() | String.t() | FFix.Command.option_callback()}
  | {:min_frag_duration,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:moov_size, integer() | String.t() | FFix.Command.option_callback()}
  | {:mov_gamma, number() | String.t() | FFix.Command.option_callback()}
  | {:movflags,
     integer()
     | String.t()
     | [
         String.t()
         | :cmaf
         | :dash
         | :default_base_moof
         | :delay_moov
         | :disable_chpl
         | :empty_moov
         | :faststart
         | :frag_custom
         | :frag_discont
         | :frag_every_frame
         | :frag_keyframe
         | :global_sidx
         | :isml
         | :negative_cts_offsets
         | :omit_tfhd_offset
         | :prefer_icc
         | :rtphint
         | :separate_moof
         | :skip_sidx
         | :skip_trailer
         | :use_metadata_tags
         | :write_colr
         | :write_gama
         | :hybrid_fragmented
       ]
     | :cmaf
     | :dash
     | :default_base_moof
     | :delay_moov
     | :disable_chpl
     | :empty_moov
     | :faststart
     | :frag_custom
     | :frag_discont
     | :frag_every_frame
     | :frag_keyframe
     | :global_sidx
     | :isml
     | :negative_cts_offsets
     | :omit_tfhd_offset
     | :prefer_icc
     | :rtphint
     | :separate_moof
     | :skip_sidx
     | :skip_trailer
     | :use_metadata_tags
     | :write_colr
     | :write_gama
     | :hybrid_fragmented
     | FFix.Command.option_callback()}
  | {:movie_timescale, integer() | String.t() | FFix.Command.option_callback()}
  | {:rtpflags,
     integer()
     | String.t()
     | [String.t() | :latm | :rfc2190 | :skip_rtcp | :h264_mode0 | :send_bye]
     | :latm
     | :rfc2190
     | :skip_rtcp
     | :h264_mode0
     | :send_bye
     | FFix.Command.option_callback()}
  | {:skip_iods,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:use_editlist,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:use_stream_ids_as_track_ids,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:video_track_timescale,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:write_btrt,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:write_prft,
     integer() | String.t() | :pts | :wallclock | FFix.Command.option_callback()}
  | {:write_tmcd,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:raw, [FFix.Command.output_av_option()]}
  | {:output_options, [FFix.Command.option()]}
```

# `mp4_option`

```elixir
@type mp4_option() ::
  {:avioflags,
   integer()
   | String.t()
   | [String.t() | :direct]
   | :direct
   | FFix.Command.option_callback()}
  | {:avoid_negative_ts,
     integer()
     | String.t()
     | :auto
     | :disabled
     | :make_non_negative
     | :make_zero
     | FFix.Command.option_callback()}
  | {:brand, String.t() | atom() | FFix.Command.option_callback()}
  | {:empty_hdlr_name,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:encryption_key, String.t() | atom() | FFix.Command.option_callback()}
  | {:encryption_kid, String.t() | atom() | FFix.Command.option_callback()}
  | {:encryption_scheme, String.t() | atom() | FFix.Command.option_callback()}
  | {:fflags,
     integer()
     | String.t()
     | [
         String.t()
         | :flush_packets
         | :ignidx
         | :genpts
         | :nofillin
         | :noparse
         | :igndts
         | :discardcorrupt
         | :sortdts
         | :fastseek
         | :nobuffer
         | :bitexact
         | :shortest
         | :autobsf
       ]
     | :flush_packets
     | :ignidx
     | :genpts
     | :nofillin
     | :noparse
     | :igndts
     | :discardcorrupt
     | :sortdts
     | :fastseek
     | :nobuffer
     | :bitexact
     | :shortest
     | :autobsf
     | FFix.Command.option_callback()}
  | {:flush_packets, integer() | String.t() | FFix.Command.option_callback()}
  | {:frag_duration, integer() | String.t() | FFix.Command.option_callback()}
  | {:frag_interleave, integer() | String.t() | FFix.Command.option_callback()}
  | {:frag_size, integer() | String.t() | FFix.Command.option_callback()}
  | {:fragment_index, integer() | String.t() | FFix.Command.option_callback()}
  | {:iods_audio_profile,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:iods_video_profile,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:ism_lookahead, integer() | String.t() | FFix.Command.option_callback()}
  | {:max_delay, integer() | String.t() | FFix.Command.option_callback()}
  | {:min_frag_duration,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:moov_size, integer() | String.t() | FFix.Command.option_callback()}
  | {:mov_gamma, number() | String.t() | FFix.Command.option_callback()}
  | {:movflags,
     integer()
     | String.t()
     | [
         String.t()
         | :cmaf
         | :dash
         | :default_base_moof
         | :delay_moov
         | :disable_chpl
         | :empty_moov
         | :faststart
         | :frag_custom
         | :frag_discont
         | :frag_every_frame
         | :frag_keyframe
         | :global_sidx
         | :isml
         | :negative_cts_offsets
         | :omit_tfhd_offset
         | :prefer_icc
         | :rtphint
         | :separate_moof
         | :skip_sidx
         | :skip_trailer
         | :use_metadata_tags
         | :write_colr
         | :write_gama
         | :hybrid_fragmented
       ]
     | :cmaf
     | :dash
     | :default_base_moof
     | :delay_moov
     | :disable_chpl
     | :empty_moov
     | :faststart
     | :frag_custom
     | :frag_discont
     | :frag_every_frame
     | :frag_keyframe
     | :global_sidx
     | :isml
     | :negative_cts_offsets
     | :omit_tfhd_offset
     | :prefer_icc
     | :rtphint
     | :separate_moof
     | :skip_sidx
     | :skip_trailer
     | :use_metadata_tags
     | :write_colr
     | :write_gama
     | :hybrid_fragmented
     | FFix.Command.option_callback()}
  | {:movie_timescale, integer() | String.t() | FFix.Command.option_callback()}
  | {:rtpflags,
     integer()
     | String.t()
     | [String.t() | :latm | :rfc2190 | :skip_rtcp | :h264_mode0 | :send_bye]
     | :latm
     | :rfc2190
     | :skip_rtcp
     | :h264_mode0
     | :send_bye
     | FFix.Command.option_callback()}
  | {:skip_iods,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:use_editlist,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:use_stream_ids_as_track_ids,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:video_track_timescale,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:write_btrt,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:write_prft,
     integer() | String.t() | :pts | :wallclock | FFix.Command.option_callback()}
  | {:write_tmcd,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:raw, [FFix.Command.output_av_option()]}
  | {:output_options, [FFix.Command.option()]}
```

# `mpegts_option`

```elixir
@type mpegts_option() ::
  {:avioflags,
   integer()
   | String.t()
   | [String.t() | :direct]
   | :direct
   | FFix.Command.option_callback()}
  | {:avoid_negative_ts,
     integer()
     | String.t()
     | :auto
     | :disabled
     | :make_non_negative
     | :make_zero
     | FFix.Command.option_callback()}
  | {:fflags,
     integer()
     | String.t()
     | [
         String.t()
         | :flush_packets
         | :ignidx
         | :genpts
         | :nofillin
         | :noparse
         | :igndts
         | :discardcorrupt
         | :sortdts
         | :fastseek
         | :nobuffer
         | :bitexact
         | :shortest
         | :autobsf
       ]
     | :flush_packets
     | :ignidx
     | :genpts
     | :nofillin
     | :noparse
     | :igndts
     | :discardcorrupt
     | :sortdts
     | :fastseek
     | :nobuffer
     | :bitexact
     | :shortest
     | :autobsf
     | FFix.Command.option_callback()}
  | {:flush_packets, integer() | String.t() | FFix.Command.option_callback()}
  | {:max_delay, integer() | String.t() | FFix.Command.option_callback()}
  | {:mpegts_copyts,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:mpegts_flags,
     integer()
     | String.t()
     | [
         String.t()
         | :resend_headers
         | :latm
         | :pat_pmt_at_frames
         | :system_b
         | :initial_discontinuity
         | :nit
         | :omit_rai
       ]
     | :resend_headers
     | :latm
     | :pat_pmt_at_frames
     | :system_b
     | :initial_discontinuity
     | :nit
     | :omit_rai
     | FFix.Command.option_callback()}
  | {:mpegts_m2ts_mode,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:mpegts_original_network_id,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:mpegts_pmt_start_pid,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:mpegts_service_id,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:mpegts_service_type,
     integer()
     | String.t()
     | :digital_tv
     | :digital_radio
     | :teletext
     | :advanced_codec_digital_radio
     | :mpeg2_digital_hdtv
     | :advanced_codec_digital_sdtv
     | :advanced_codec_digital_hdtv
     | :hevc_digital_hdtv
     | FFix.Command.option_callback()}
  | {:mpegts_start_pid, integer() | String.t() | FFix.Command.option_callback()}
  | {:mpegts_transport_stream_id,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:muxrate, integer() | String.t() | FFix.Command.option_callback()}
  | {:nit_period, number() | String.t() | FFix.Command.option_callback()}
  | {:omit_video_pes_length,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:pat_period, number() | String.t() | FFix.Command.option_callback()}
  | {:pcr_period, integer() | String.t() | FFix.Command.option_callback()}
  | {:pes_payload_size, integer() | String.t() | FFix.Command.option_callback()}
  | {:sdt_period, number() | String.t() | FFix.Command.option_callback()}
  | {:tables_version, integer() | String.t() | FFix.Command.option_callback()}
  | {:raw, [FFix.Command.output_av_option()]}
  | {:output_options, [FFix.Command.option()]}
```

# `null_option`

```elixir
@type null_option() ::
  {:avioflags,
   integer()
   | String.t()
   | [String.t() | :direct]
   | :direct
   | FFix.Command.option_callback()}
  | {:avoid_negative_ts,
     integer()
     | String.t()
     | :auto
     | :disabled
     | :make_non_negative
     | :make_zero
     | FFix.Command.option_callback()}
  | {:fflags,
     integer()
     | String.t()
     | [
         String.t()
         | :flush_packets
         | :ignidx
         | :genpts
         | :nofillin
         | :noparse
         | :igndts
         | :discardcorrupt
         | :sortdts
         | :fastseek
         | :nobuffer
         | :bitexact
         | :shortest
         | :autobsf
       ]
     | :flush_packets
     | :ignidx
     | :genpts
     | :nofillin
     | :noparse
     | :igndts
     | :discardcorrupt
     | :sortdts
     | :fastseek
     | :nobuffer
     | :bitexact
     | :shortest
     | :autobsf
     | FFix.Command.option_callback()}
  | {:flush_packets, integer() | String.t() | FFix.Command.option_callback()}
  | {:max_delay, integer() | String.t() | FFix.Command.option_callback()}
  | {:raw, [FFix.Command.output_av_option()]}
  | {:output_options, [FFix.Command.option()]}
```

# `segment_option`

```elixir
@type segment_option() ::
  {:avioflags,
   integer()
   | String.t()
   | [String.t() | :direct]
   | :direct
   | FFix.Command.option_callback()}
  | {:avoid_negative_ts,
     integer()
     | String.t()
     | :auto
     | :disabled
     | :make_non_negative
     | :make_zero
     | FFix.Command.option_callback()}
  | {:break_non_keyframes,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:fflags,
     integer()
     | String.t()
     | [
         String.t()
         | :flush_packets
         | :ignidx
         | :genpts
         | :nofillin
         | :noparse
         | :igndts
         | :discardcorrupt
         | :sortdts
         | :fastseek
         | :nobuffer
         | :bitexact
         | :shortest
         | :autobsf
       ]
     | :flush_packets
     | :ignidx
     | :genpts
     | :nofillin
     | :noparse
     | :igndts
     | :discardcorrupt
     | :sortdts
     | :fastseek
     | :nobuffer
     | :bitexact
     | :shortest
     | :autobsf
     | FFix.Command.option_callback()}
  | {:flush_packets, integer() | String.t() | FFix.Command.option_callback()}
  | {:increment_tc,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:individual_header_trailer,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:initial_offset, number() | String.t() | FFix.Command.option_callback()}
  | {:max_delay, integer() | String.t() | FFix.Command.option_callback()}
  | {:min_seg_duration, number() | String.t() | FFix.Command.option_callback()}
  | {:reference_stream, String.t() | atom() | FFix.Command.option_callback()}
  | {:reset_timestamps,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:segment_atclocktime,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:segment_clocktime_offset,
     number() | String.t() | FFix.Command.option_callback()}
  | {:segment_clocktime_wrap_duration,
     number() | String.t() | FFix.Command.option_callback()}
  | {:segment_format, String.t() | atom() | FFix.Command.option_callback()}
  | {:segment_format_options,
     String.t() | atom() | FFix.Command.option_callback()}
  | {:segment_frames, String.t() | atom() | FFix.Command.option_callback()}
  | {:segment_header_filename,
     String.t() | atom() | FFix.Command.option_callback()}
  | {:segment_list, String.t() | atom() | FFix.Command.option_callback()}
  | {:segment_list_entry_prefix,
     String.t() | atom() | FFix.Command.option_callback()}
  | {:segment_list_flags,
     integer()
     | String.t()
     | [String.t() | :cache | :live]
     | :cache
     | :live
     | FFix.Command.option_callback()}
  | {:segment_list_size,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:segment_list_type,
     integer()
     | String.t()
     | :flat
     | :csv
     | :ext
     | :ffconcat
     | :m3u8
     | :hls
     | FFix.Command.option_callback()}
  | {:segment_start_number,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:segment_time, number() | String.t() | FFix.Command.option_callback()}
  | {:segment_time_delta,
     number() | String.t() | FFix.Command.option_callback()}
  | {:segment_times, String.t() | atom() | FFix.Command.option_callback()}
  | {:segment_wrap, integer() | String.t() | FFix.Command.option_callback()}
  | {:segment_wrap_number,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:strftime, boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:write_empty_segments,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:write_header_trailer,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:raw, [FFix.Command.output_av_option()]}
  | {:output_options, [FFix.Command.option()]}
```

# `t`

```elixir
@type t() :: %FFix.Muxer{
  name: String.t() | nil,
  options: [FFix.Command.output_av_option()]
}
```

# `tee_option`

```elixir
@type tee_option() ::
  {:avioflags,
   integer()
   | String.t()
   | [String.t() | :direct]
   | :direct
   | FFix.Command.option_callback()}
  | {:avoid_negative_ts,
     integer()
     | String.t()
     | :auto
     | :disabled
     | :make_non_negative
     | :make_zero
     | FFix.Command.option_callback()}
  | {:fflags,
     integer()
     | String.t()
     | [
         String.t()
         | :flush_packets
         | :ignidx
         | :genpts
         | :nofillin
         | :noparse
         | :igndts
         | :discardcorrupt
         | :sortdts
         | :fastseek
         | :nobuffer
         | :bitexact
         | :shortest
         | :autobsf
       ]
     | :flush_packets
     | :ignidx
     | :genpts
     | :nofillin
     | :noparse
     | :igndts
     | :discardcorrupt
     | :sortdts
     | :fastseek
     | :nobuffer
     | :bitexact
     | :shortest
     | :autobsf
     | FFix.Command.option_callback()}
  | {:fifo_options, String.t() | atom() | FFix.Command.option_callback()}
  | {:flush_packets, integer() | String.t() | FFix.Command.option_callback()}
  | {:max_delay, integer() | String.t() | FFix.Command.option_callback()}
  | {:use_fifo, boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:raw, [FFix.Command.output_av_option()]}
  | {:output_options, [FFix.Command.option()]}
```

# `webm_option`

```elixir
@type webm_option() ::
  {:allow_raw_vfw,
   boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:avioflags,
     integer()
     | String.t()
     | [String.t() | :direct]
     | :direct
     | FFix.Command.option_callback()}
  | {:avoid_negative_ts,
     integer()
     | String.t()
     | :auto
     | :disabled
     | :make_non_negative
     | :make_zero
     | FFix.Command.option_callback()}
  | {:cluster_size_limit,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:cluster_time_limit,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:cues_to_front,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:dash, boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:dash_track_number,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:default_mode,
     integer()
     | String.t()
     | :infer
     | :infer_no_subs
     | :passthrough
     | FFix.Command.option_callback()}
  | {:fflags,
     integer()
     | String.t()
     | [
         String.t()
         | :flush_packets
         | :ignidx
         | :genpts
         | :nofillin
         | :noparse
         | :igndts
         | :discardcorrupt
         | :sortdts
         | :fastseek
         | :nobuffer
         | :bitexact
         | :shortest
         | :autobsf
       ]
     | :flush_packets
     | :ignidx
     | :genpts
     | :nofillin
     | :noparse
     | :igndts
     | :discardcorrupt
     | :sortdts
     | :fastseek
     | :nobuffer
     | :bitexact
     | :shortest
     | :autobsf
     | FFix.Command.option_callback()}
  | {:flipped_raw_rgb,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:flush_packets, integer() | String.t() | FFix.Command.option_callback()}
  | {:live, boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:max_delay, integer() | String.t() | FFix.Command.option_callback()}
  | {:reserve_index_space,
     integer() | String.t() | FFix.Command.option_callback()}
  | {:write_crc32,
     boolean() | :auto | String.t() | FFix.Command.option_callback()}
  | {:raw, [FFix.Command.output_av_option()]}
  | {:output_options, [FFix.Command.option()]}
```

# `hls`

```elixir
@spec hls(
  FFix.Command.binding() | [FFix.Command.binding()],
  FFix.Command.Output.target(),
  [
    hls_option()
  ]
) :: FFix.Command.Output.t()
```

Apple HTTP Live Streaming

Declares an output in hls format. See `FFix.Muxer` for usage and option conventions.

## Example

    FFix.Muxer.hls(sources, "hls/index.m3u8", hls_time: 4)

## Options

- `start_number` (int64): set first number in the sequence (from 0 to I64_MAX) (default 0)
- `hls_time` (duration): set segment length (default 2)
- `hls_init_time` (duration): set segment length at init list (default 0)
- `hls_list_size` (int): set maximum number of playlist entries (from 0 to INT_MAX) (default 5)
- `hls_delete_threshold` (int): set number of unreferenced segments to keep before deleting (from 1 to INT_MAX) (default 1)
- `hls_vtt_options` (string): set hls vtt list of options for the container format used for hls
- `hls_allow_cache` (int): explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments (from INT_MIN to INT_MAX) (default -1)
- `hls_base_url` (string): url to prepend to each playlist entry
- `hls_segment_filename` (string): filename template for segment files
- `hls_segment_options` (dictionary): set segments files format options of hls
- `hls_segment_size` (int): maximum size per segment file, (in bytes) (from 0 to INT_MAX) (default 0)
- `hls_key_info_file` (string): file with key URI and key file path
- `hls_enc` (boolean): enable AES128 encryption support (default false)
- `hls_enc_key` (string): hex-coded 16 byte key to encrypt the segments
- `hls_enc_key_url` (string): url to access the key to decrypt the segments
- `hls_enc_iv` (string): hex-coded 16 byte initialization vector
- `hls_subtitle_path` (string): set path of hls subtitles
- `hls_segment_type` (int): set hls segment files type (from 0 to 1) (default mpegts) Values: `mpegts`, `fmp4`.
- `hls_fmp4_init_filename` (string): set fragment mp4 file init filename (default "init.mp4")
- `hls_fmp4_init_resend` (boolean): resend fragment mp4 init file after refresh m3u8 every time (default false)
- `hls_flags` (flags): set flags affecting HLS playlist and media file generation (default 0) Values: `single_file`, `temp_file`, `delete_segments`, `round_durations`, `discont_start`, `omit_endlist`, `split_by_time`, `append_list`, `program_date_time`, `second_level_segment_index`, `second_level_segment_duration`, `second_level_segment_size`, `periodic_rekey`, `independent_segments`, `iframes_only`.
- `strftime` (boolean): set filename expansion with strftime at segment creation (default false)
- `strftime_mkdir` (boolean): create last directory component in strftime-generated filename (default false)
- `hls_playlist_type` (int): set the HLS playlist type (from 0 to 2) (default 0) Values: `event`, `vod`.
- `method` (string): set the HTTP method(default: PUT)
- `hls_start_number_source` (int): set source of first number in sequence (from 0 to 3) (default generic) Values: `generic`, `epoch`, `epoch_us`, `datetime`.
- `http_user_agent` (string): override User-Agent field in HTTP header
- `var_stream_map` (string): Variant stream map string
- `cc_stream_map` (string): Closed captions stream map string
- `master_pl_name` (string): Create HLS master playlist with this name
- `master_pl_publish_rate` (int): Publish master play list every after this many segment intervals (from 0 to UINT32_MAX) (default 0)
- `http_persistent` (boolean): Use persistent HTTP connections (default false)
- `timeout` (duration): set timeout for socket I/O operations (default -0.000001)
- `ignore_io_errors` (boolean): Ignore IO errors for stable long-duration runs with network output (default false)
- `headers` (string): set custom HTTP headers, can override built in default headers
- `avioflags` (flags): (default 0) Values: `direct`.
- `fflags` (flags): (default autobsf) Values: `flush_packets`, `ignidx`, `genpts`, `nofillin`, `noparse`, `igndts`, `discardcorrupt`, `sortdts`, `fastseek`, `nobuffer`, `bitexact`, `shortest`, `autobsf`.
- `max_delay` (int): maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
- `flush_packets` (int): enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
- `avoid_negative_ts` (int): shift timestamps so they start at 0 (from -1 to 2) (default auto) Values: `auto`, `disabled`, `make_non_negative`, `make_zero`.

## Format and codec details

- Common extensions: m3u8.
- Default video codec: h264.
- Default audio codec: aac.
- Default subtitle codec: webvtt.

# `image2`

```elixir
@spec image2(
  FFix.Command.binding() | [FFix.Command.binding()],
  FFix.Command.Output.target(),
  [
    image2_option()
  ]
) :: FFix.Command.Output.t()
```

image2 sequence

Declares an output in image2 format. See `FFix.Muxer` for usage and option conventions.

## Options

- `update` (boolean): continuously overwrite one file (default false)
- `start_number` (int): set first number in the sequence (from 0 to INT_MAX) (default 1)
- `strftime` (boolean): use strftime for filename (default false)
- `frame_pts` (boolean): use current frame pts for filename (default false)
- `atomic_writing` (boolean): write files atomically (using temporary files and renames) (default false)
- `protocol_opts` (dictionary): specify protocol options for the opened files
- `avioflags` (flags): (default 0) Values: `direct`.
- `fflags` (flags): (default autobsf) Values: `flush_packets`, `ignidx`, `genpts`, `nofillin`, `noparse`, `igndts`, `discardcorrupt`, `sortdts`, `fastseek`, `nobuffer`, `bitexact`, `shortest`, `autobsf`.
- `max_delay` (int): maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
- `flush_packets` (int): enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
- `avoid_negative_ts` (int): shift timestamps so they start at 0 (from -1 to 2) (default auto) Values: `auto`, `disabled`, `make_non_negative`, `make_zero`.

## Format and codec details

- Common extensions: bmp,dpx,exr,jls,jpeg,jpg,jxl,ljpg,pam,pbm,pcx,pfm,pgm,pgmyuv,phm,png,ppm,sgi,tga,tif,tiff,jp2,j2c,j2k,xwd,sun,ras,rs,im1,im8,im24,sunras,vbn,xbm,xface,pix,y,avif,qoi,hdr,wbmp.
- Default video codec: mjpeg.

# `matroska`

```elixir
@spec matroska(
  FFix.Command.binding() | [FFix.Command.binding()],
  FFix.Command.Output.target(),
  [
    matroska_option()
  ]
) :: FFix.Command.Output.t()
```

Matroska

Declares an output in matroska format. See `FFix.Muxer` for usage and option conventions.

## Example

    FFix.Muxer.matroska(sources, "archive.mkv")

## Options

- `reserve_index_space` (int): reserve a given amount of space (in bytes) at the beginning of the file for the index (cues) (from 0 to INT_MAX) (default 0)
- `cues_to_front` (boolean): move Cues (the index) to the front by shifting data if necessary (default false)
- `cluster_size_limit` (int): store at most the provided amount of bytes in a cluster (from -1 to INT_MAX) (default -1)
- `cluster_time_limit` (int64): store at most the provided number of milliseconds in a cluster (from -1 to I64_MAX) (default -1)
- `dash` (boolean): create a WebM file conforming to WebM DASH specification (default false)
- `dash_track_number` (int): track number for the DASH stream (from 1 to INT_MAX) (default 1)
- `live` (boolean): write files assuming it is a live stream (default false)
- `allow_raw_vfw` (boolean): allow raw VFW mode (default false)
- `flipped_raw_rgb` (boolean): store raw RGB bitmaps in VFW mode in bottom-up mode (default false)
- `write_crc32` (boolean): write a CRC32 element inside every Level 1 element (default true)
- `default_mode` (int): control how a track's FlagDefault is inferred (from 0 to 2) (default passthrough) Values: `infer`, `infer_no_subs`, `passthrough`.
- `avioflags` (flags): (default 0) Values: `direct`.
- `fflags` (flags): (default autobsf) Values: `flush_packets`, `ignidx`, `genpts`, `nofillin`, `noparse`, `igndts`, `discardcorrupt`, `sortdts`, `fastseek`, `nobuffer`, `bitexact`, `shortest`, `autobsf`.
- `max_delay` (int): maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
- `flush_packets` (int): enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
- `avoid_negative_ts` (int): shift timestamps so they start at 0 (from -1 to 2) (default auto) Values: `auto`, `disabled`, `make_non_negative`, `make_zero`.

## Format and codec details

- Common extensions: mkv.
- Mime type: video/x-matroska.
- Default video codec: h264.
- Default audio codec: vorbis.
- Default subtitle codec: ass.

# `mov`

```elixir
@spec mov(
  FFix.Command.binding() | [FFix.Command.binding()],
  FFix.Command.Output.target(),
  [
    mov_option()
  ]
) :: FFix.Command.Output.t()
```

QuickTime / MOV

Declares an output in mov format. See `FFix.Muxer` for usage and option conventions.

## Options

- `brand` (string): Override major brand
- `empty_hdlr_name` (boolean): write zero-length name string in hdlr atoms within mdia and minf atoms (default false)
- `encryption_key` (binary): The media encryption key (hex)
- `encryption_kid` (binary): The media encryption key identifier (hex)
- `encryption_scheme` (string): Configures the encryption scheme, allowed values are none, cenc-aes-ctr
- `frag_duration` (int): Maximum fragment duration (from 0 to INT_MAX) (default 0)
- `frag_interleave` (int): Interleave samples within fragments (max number of consecutive samples, lower is tighter interleaving, but with more overhead) (from 0 to INT_MAX) (default 0)
- `frag_size` (int): Maximum fragment size (from 0 to INT_MAX) (default 0)
- `fragment_index` (int): Fragment number of the next fragment (from 1 to INT_MAX) (default 1)
- `iods_audio_profile` (int): iods audio profile atom. (from -1 to 255) (default -1)
- `iods_video_profile` (int): iods video profile atom. (from -1 to 255) (default -1)
- `ism_lookahead` (int): Number of lookahead entries for ISM files (from 0 to 255) (default 0)
- `movflags` (flags): MOV muxer flags (default 0) Values: `cmaf`, `dash`, `default_base_moof`, `delay_moov`, `disable_chpl`, `empty_moov`, `faststart`, `frag_custom`, `frag_discont`, `frag_every_frame`, `frag_keyframe`, `global_sidx`, `isml`, `negative_cts_offsets`, `omit_tfhd_offset`, `prefer_icc`, `rtphint`, `separate_moof`, `skip_sidx`, `skip_trailer`, `use_metadata_tags`, `write_colr`, `write_gama`, `hybrid_fragmented`.
- `moov_size` (int): maximum moov size so it can be placed at the begin (from 0 to INT_MAX) (default 0)
- `min_frag_duration` (int): Minimum fragment duration (from 0 to INT_MAX) (default 0)
- `mov_gamma` (float): gamma value for gama atom (from 0 to 10) (default 0)
- `movie_timescale` (int): set movie timescale (from 1 to INT_MAX) (default 1000)
- `rtpflags` (flags): RTP muxer flags (default 0) Values: `latm`, `rfc2190`, `skip_rtcp`, `h264_mode0`, `send_bye`.
- `skip_iods` (boolean): Skip writing iods atom. (default true)
- `use_editlist` (boolean): use edit list (default auto)
- `use_stream_ids_as_track_ids` (boolean): use stream ids as track ids (default false)
- `video_track_timescale` (int): set timescale of all video tracks (from 0 to INT_MAX) (default 0)
- `write_btrt` (boolean): force or disable writing btrt (default auto)
- `write_prft` (int): Write producer reference time box with specified time source (from 0 to 2) (default 0) Values: `pts`, `wallclock`.
- `write_tmcd` (boolean): force or disable writing tmcd (default auto)
- `avioflags` (flags): (default 0) Values: `direct`.
- `fflags` (flags): (default autobsf) Values: `flush_packets`, `ignidx`, `genpts`, `nofillin`, `noparse`, `igndts`, `discardcorrupt`, `sortdts`, `fastseek`, `nobuffer`, `bitexact`, `shortest`, `autobsf`.
- `max_delay` (int): maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
- `flush_packets` (int): enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
- `avoid_negative_ts` (int): shift timestamps so they start at 0 (from -1 to 2) (default auto) Values: `auto`, `disabled`, `make_non_negative`, `make_zero`.

## Format and codec details

- Common extensions: mov.
- Default video codec: h264.
- Default audio codec: aac.

# `mp4`

```elixir
@spec mp4(
  FFix.Command.binding() | [FFix.Command.binding()],
  FFix.Command.Output.target(),
  [
    mp4_option()
  ]
) :: FFix.Command.Output.t()
```

MP4 (MPEG-4 Part 14)

Declares an output in mp4 format. See `FFix.Muxer` for usage and option conventions.

## Example

    FFix.Muxer.mp4(sources, "interview.mp4", movflags: [:faststart])

## Options

- `brand` (string): Override major brand
- `empty_hdlr_name` (boolean): write zero-length name string in hdlr atoms within mdia and minf atoms (default false)
- `encryption_key` (binary): The media encryption key (hex)
- `encryption_kid` (binary): The media encryption key identifier (hex)
- `encryption_scheme` (string): Configures the encryption scheme, allowed values are none, cenc-aes-ctr
- `frag_duration` (int): Maximum fragment duration (from 0 to INT_MAX) (default 0)
- `frag_interleave` (int): Interleave samples within fragments (max number of consecutive samples, lower is tighter interleaving, but with more overhead) (from 0 to INT_MAX) (default 0)
- `frag_size` (int): Maximum fragment size (from 0 to INT_MAX) (default 0)
- `fragment_index` (int): Fragment number of the next fragment (from 1 to INT_MAX) (default 1)
- `iods_audio_profile` (int): iods audio profile atom. (from -1 to 255) (default -1)
- `iods_video_profile` (int): iods video profile atom. (from -1 to 255) (default -1)
- `ism_lookahead` (int): Number of lookahead entries for ISM files (from 0 to 255) (default 0)
- `movflags` (flags): MOV muxer flags (default 0) Values: `cmaf`, `dash`, `default_base_moof`, `delay_moov`, `disable_chpl`, `empty_moov`, `faststart`, `frag_custom`, `frag_discont`, `frag_every_frame`, `frag_keyframe`, `global_sidx`, `isml`, `negative_cts_offsets`, `omit_tfhd_offset`, `prefer_icc`, `rtphint`, `separate_moof`, `skip_sidx`, `skip_trailer`, `use_metadata_tags`, `write_colr`, `write_gama`, `hybrid_fragmented`.
- `moov_size` (int): maximum moov size so it can be placed at the begin (from 0 to INT_MAX) (default 0)
- `min_frag_duration` (int): Minimum fragment duration (from 0 to INT_MAX) (default 0)
- `mov_gamma` (float): gamma value for gama atom (from 0 to 10) (default 0)
- `movie_timescale` (int): set movie timescale (from 1 to INT_MAX) (default 1000)
- `rtpflags` (flags): RTP muxer flags (default 0) Values: `latm`, `rfc2190`, `skip_rtcp`, `h264_mode0`, `send_bye`.
- `skip_iods` (boolean): Skip writing iods atom. (default true)
- `use_editlist` (boolean): use edit list (default auto)
- `use_stream_ids_as_track_ids` (boolean): use stream ids as track ids (default false)
- `video_track_timescale` (int): set timescale of all video tracks (from 0 to INT_MAX) (default 0)
- `write_btrt` (boolean): force or disable writing btrt (default auto)
- `write_prft` (int): Write producer reference time box with specified time source (from 0 to 2) (default 0) Values: `pts`, `wallclock`.
- `write_tmcd` (boolean): force or disable writing tmcd (default auto)
- `avioflags` (flags): (default 0) Values: `direct`.
- `fflags` (flags): (default autobsf) Values: `flush_packets`, `ignidx`, `genpts`, `nofillin`, `noparse`, `igndts`, `discardcorrupt`, `sortdts`, `fastseek`, `nobuffer`, `bitexact`, `shortest`, `autobsf`.
- `max_delay` (int): maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
- `flush_packets` (int): enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
- `avoid_negative_ts` (int): shift timestamps so they start at 0 (from -1 to 2) (default auto) Values: `auto`, `disabled`, `make_non_negative`, `make_zero`.

## Format and codec details

- Common extensions: mp4.
- Mime type: video/mp4.
- Default video codec: h264.
- Default audio codec: aac.

# `mpegts`

```elixir
@spec mpegts(
  FFix.Command.binding() | [FFix.Command.binding()],
  FFix.Command.Output.target(),
  [
    mpegts_option()
  ]
) :: FFix.Command.Output.t()
```

MPEG-TS (MPEG-2 Transport Stream)

Declares an output in mpegts format. See `FFix.Muxer` for usage and option conventions.

## Options

- `mpegts_transport_stream_id` (int): Set transport_stream_id field. (from 1 to 65535) (default 1)
- `mpegts_original_network_id` (int): Set original_network_id field. (from 1 to 65535) (default 65281)
- `mpegts_service_id` (int): Set service_id field. (from 1 to 65535) (default 1)
- `mpegts_service_type` (int): Set service_type field. (from 1 to 255) (default digital_tv) Values: `digital_tv`, `digital_radio`, `teletext`, `advanced_codec_digital_radio`, `mpeg2_digital_hdtv`, `advanced_codec_digital_sdtv`, `advanced_codec_digital_hdtv`, `hevc_digital_hdtv`.
- `mpegts_pmt_start_pid` (int): Set the first pid of the PMT. (from 32 to 8186) (default 4096)
- `mpegts_start_pid` (int): Set the first pid. (from 32 to 8186) (default 256)
- `mpegts_m2ts_mode` (boolean): Enable m2ts mode. (default auto)
- `muxrate` (int): (from 0 to INT_MAX) (default 1)
- `pes_payload_size` (int): Minimum PES packet payload in bytes (from 0 to INT_MAX) (default 2930)
- `mpegts_flags` (flags): MPEG-TS muxing flags (default 0) Values: `resend_headers`, `latm`, `pat_pmt_at_frames`, `system_b`, `initial_discontinuity`, `nit`, `omit_rai`.
- `mpegts_copyts` (boolean): don't offset dts/pts (default auto)
- `tables_version` (int): set PAT, PMT, SDT and NIT version (from 0 to 31) (default 0)
- `omit_video_pes_length` (boolean): Omit the PES packet length for video packets (default true)
- `pcr_period` (int): PCR retransmission time in milliseconds (from -1 to INT_MAX) (default -1)
- `pat_period` (duration): PAT/PMT retransmission time limit in seconds (default 0.1)
- `sdt_period` (duration): SDT retransmission time limit in seconds (default 0.5)
- `nit_period` (duration): NIT retransmission time limit in seconds (default 0.5)
- `avioflags` (flags): (default 0) Values: `direct`.
- `fflags` (flags): (default autobsf) Values: `flush_packets`, `ignidx`, `genpts`, `nofillin`, `noparse`, `igndts`, `discardcorrupt`, `sortdts`, `fastseek`, `nobuffer`, `bitexact`, `shortest`, `autobsf`.
- `max_delay` (int): maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
- `flush_packets` (int): enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
- `avoid_negative_ts` (int): shift timestamps so they start at 0 (from -1 to 2) (default auto) Values: `auto`, `disabled`, `make_non_negative`, `make_zero`.

## Format and codec details

- Common extensions: ts,m2t,m2ts,mts.
- Mime type: video/MP2T.
- Default video codec: mpeg2video.
- Default audio codec: mp2.

# `mux`

```elixir
@spec mux(
  FFix.Command.binding() | [FFix.Command.binding()],
  String.t(),
  FFix.Command.Output.target(),
  list()
) :: FFix.Command.Output.t()
```

Declares an output using an FFmpeg format name and its options.

    FFix.Muxer.mux(audio, "flac", "recording.flac")

Format names and options are passed to FFmpeg. Place general output controls,
such as a duration limit, in `output_options:`.

# `new`

```elixir
@spec new(String.t() | nil, [FFix.Command.output_av_option()]) :: t()
```

Builds a muxer configuration for the `muxer:` option of `FFix.output/3`.

    muxer = FFix.Muxer.new("mp4", movflags: "faststart")
    FFix.output(video, "video.mp4", muxer: muxer)

Use a `nil` name to let FFmpeg select the format while applying the options.

# `null`

```elixir
@spec null(
  FFix.Command.binding() | [FFix.Command.binding()],
  FFix.Command.Output.target(),
  [
    null_option()
  ]
) :: FFix.Command.Output.t()
```

raw null video

Declares an output in null format. See `FFix.Muxer` for usage and option conventions.

## Example

    FFix.Muxer.null(sources, :stdout)

## Options

- `avioflags` (flags): (default 0) Values: `direct`.
- `fflags` (flags): (default autobsf) Values: `flush_packets`, `ignidx`, `genpts`, `nofillin`, `noparse`, `igndts`, `discardcorrupt`, `sortdts`, `fastseek`, `nobuffer`, `bitexact`, `shortest`, `autobsf`.
- `max_delay` (int): maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
- `flush_packets` (int): enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
- `avoid_negative_ts` (int): shift timestamps so they start at 0 (from -1 to 2) (default auto) Values: `auto`, `disabled`, `make_non_negative`, `make_zero`.

## Format and codec details

- Default video codec: wrapped_avframe.
- Default audio codec: pcm_s16le.

# `segment`

```elixir
@spec segment(
  FFix.Command.binding() | [FFix.Command.binding()],
  FFix.Command.Output.target(),
  [
    segment_option()
  ]
) :: FFix.Command.Output.t()
```

segment

Declares an output in segment format. See `FFix.Muxer` for usage and option conventions.

## Options

- `reference_stream` (string): set reference stream (default "auto")
- `segment_format` (string): set container format used for the segments
- `segment_format_options` (dictionary): set list of options for the container format used for the segments
- `segment_list` (string): set the segment list filename
- `segment_header_filename` (string): write a single file containing the header
- `segment_list_flags` (flags): set flags affecting segment list generation (default cache) Values: `cache`, `live`.
- `segment_list_size` (int): set the maximum number of playlist entries (from 0 to INT_MAX) (default 0)
- `segment_list_type` (int): set the segment list type (from -1 to 4) (default -1) Values: `flat`, `csv`, `ext`, `ffconcat`, `m3u8`, `hls`.
- `segment_atclocktime` (boolean): set segment to be cut at clocktime (default false)
- `segment_clocktime_offset` (duration): set segment clocktime offset (default 0)
- `segment_clocktime_wrap_duration` (duration): set segment clocktime wrapping duration (default INT64_MAX)
- `segment_time` (duration): set segment duration (default 2)
- `segment_time_delta` (duration): set approximation value used for the segment times (default 0)
- `min_seg_duration` (duration): set minimum segment duration (default 0)
- `segment_times` (string): set segment split time points
- `segment_frames` (string): set segment split frame numbers
- `segment_wrap` (int): set number after which the index wraps (from 0 to INT_MAX) (default 0)
- `segment_list_entry_prefix` (string): set base url prefix for segments
- `segment_start_number` (int): set the sequence number of the first segment (from 0 to INT_MAX) (default 0)
- `segment_wrap_number` (int): set the number of wrap before the first segment (from 0 to INT_MAX) (default 0)
- `strftime` (boolean): set filename expansion with strftime at segment creation (default false)
- `increment_tc` (boolean): increment timecode between each segment (default false)
- `break_non_keyframes` (boolean): allow breaking segments on non-keyframes (default false)
- `individual_header_trailer` (boolean): write header/trailer to each segment (default true)
- `write_header_trailer` (boolean): write a header to the first segment and a trailer to the last one (default true)
- `reset_timestamps` (boolean): reset timestamps at the beginning of each segment (default false)
- `initial_offset` (duration): set initial timestamp offset (default 0)
- `write_empty_segments` (boolean): allow writing empty 'filler' segments (default false)
- `avioflags` (flags): (default 0) Values: `direct`.
- `fflags` (flags): (default autobsf) Values: `flush_packets`, `ignidx`, `genpts`, `nofillin`, `noparse`, `igndts`, `discardcorrupt`, `sortdts`, `fastseek`, `nobuffer`, `bitexact`, `shortest`, `autobsf`.
- `max_delay` (int): maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
- `flush_packets` (int): enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
- `avoid_negative_ts` (int): shift timestamps so they start at 0 (from -1 to 2) (default auto) Values: `auto`, `disabled`, `make_non_negative`, `make_zero`.

# `tee`

```elixir
@spec tee(
  FFix.Command.binding() | [FFix.Command.binding()],
  FFix.Command.Output.target(),
  [
    tee_option()
  ]
) :: FFix.Command.Output.t()
```

Multiple muxer tee

Declares an output in tee format. See `FFix.Muxer` for usage and option conventions.

## Options

- `use_fifo` (boolean): Use fifo pseudo-muxer to separate actual muxers from encoder (default false)
- `fifo_options` (dictionary): fifo pseudo-muxer options
- `avioflags` (flags): (default 0) Values: `direct`.
- `fflags` (flags): (default autobsf) Values: `flush_packets`, `ignidx`, `genpts`, `nofillin`, `noparse`, `igndts`, `discardcorrupt`, `sortdts`, `fastseek`, `nobuffer`, `bitexact`, `shortest`, `autobsf`.
- `max_delay` (int): maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
- `flush_packets` (int): enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
- `avoid_negative_ts` (int): shift timestamps so they start at 0 (from -1 to 2) (default auto) Values: `auto`, `disabled`, `make_non_negative`, `make_zero`.

# `webm`

```elixir
@spec webm(
  FFix.Command.binding() | [FFix.Command.binding()],
  FFix.Command.Output.target(),
  [
    webm_option()
  ]
) :: FFix.Command.Output.t()
```

WebM

Declares an output in webm format. See `FFix.Muxer` for usage and option conventions.

## Options

- `reserve_index_space` (int): reserve a given amount of space (in bytes) at the beginning of the file for the index (cues) (from 0 to INT_MAX) (default 0)
- `cues_to_front` (boolean): move Cues (the index) to the front by shifting data if necessary (default false)
- `cluster_size_limit` (int): store at most the provided amount of bytes in a cluster (from -1 to INT_MAX) (default -1)
- `cluster_time_limit` (int64): store at most the provided number of milliseconds in a cluster (from -1 to I64_MAX) (default -1)
- `dash` (boolean): create a WebM file conforming to WebM DASH specification (default false)
- `dash_track_number` (int): track number for the DASH stream (from 1 to INT_MAX) (default 1)
- `live` (boolean): write files assuming it is a live stream (default false)
- `allow_raw_vfw` (boolean): allow raw VFW mode (default false)
- `flipped_raw_rgb` (boolean): store raw RGB bitmaps in VFW mode in bottom-up mode (default false)
- `write_crc32` (boolean): write a CRC32 element inside every Level 1 element (default true)
- `default_mode` (int): control how a track's FlagDefault is inferred (from 0 to 2) (default passthrough) Values: `infer`, `infer_no_subs`, `passthrough`.
- `avioflags` (flags): (default 0) Values: `direct`.
- `fflags` (flags): (default autobsf) Values: `flush_packets`, `ignidx`, `genpts`, `nofillin`, `noparse`, `igndts`, `discardcorrupt`, `sortdts`, `fastseek`, `nobuffer`, `bitexact`, `shortest`, `autobsf`.
- `max_delay` (int): maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
- `flush_packets` (int): enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
- `avoid_negative_ts` (int): shift timestamps so they start at 0 (from -1 to 2) (default auto) Values: `auto`, `disabled`, `make_non_negative`, `make_zero`.

## Format and codec details

- Common extensions: webm.
- Mime type: video/webm.
- Default video codec: vp9.
- Default audio codec: opus.
- Default subtitle codec: webvtt.

---

*Consult [api-reference.md](api-reference.md) for complete listing*