schema_version: 0.3
type: consumer
identifier: avformat
title: FFmpeg Output
version: 3
copyright: Copyright (C) 2003-2019 Meltytech, LLC
license: LGPL
language: en
url: http://www.ffmpeg.org/
creator: Charles Yates
contributor:
  - Dan Dennedy
tags:
  - Audio
  - Video
description: Write or stream audio and/or video using FFmpeg.
notes: >
  The avformat consumer uses the FFmpeg libraries to encode to a file or
  network stream. You can get a lot of information about how to encode with
  FFmpeg all over the web including FFmpeg's web site. With melt, you
  simply need to add "-consumer avformat:output.file" to the command line
  followed by the encoding parameters by translating ffmpeg's '-option value'
  syntax to melt's 'option=value' syntax.

  Not all ffmpeg options are supported. Some are very specific to
  avconv/ffmpeg, the command line utility, and not an "AVOption" used in the
  libraries. In some cases, there are ffmpeg options that are not AVOptions but
  which closely resemble an existing MLT property. In that case, MLT supports
  the ffmpeg option name. For example, ffmpeg's "-ac" is equivalent to the MLT
  "channels" property. Therefore, the avformat consumer also supports the "ac"
  property. Complete details are below.

  Please note that the exact options depend on the version of libavformat and
  libavcodec on your system. The following is based on FFmpeg v4.0.

parameters:
  - identifier: target
    argument: yes
    title: File/URL
    type: string
    description: >
      This is not the same thing as the ffmpeg -target option! If this is not
      supplied then it will output to stdout.
    widget: filesave

  - identifier: mlt_profile
    title: MLT Profile
    type: string
    description: >
      Choose a MLT basic video settings preset.
      This overrides a profile that may have been set elsewhere.

  - identifier: redirect
    title: Redirect I/O
    description: >
      This option allows other services to encapsulate the avformat consumer and
      do something different (not already available in a protocol) with its
      output by listening to the avformat-write event.
    type: integer
    minimum: 0
    maximum: 1
    default: 0
    widget: checkbox

# These override the MLT profile
  - identifier: width
    title: Width
    type: integer
    minimum: 0
    unit: pixels

  - identifier: height
    title: Height
    type: integer
    minimum: 0
    unit: pixels


  - identifier: display_aspect_num
    title: Display aspect ratio numerator
    type: integer
    minimum: 0

  - identifier: display_aspect_den
    title: Display aspect ratio denominator
    type: integer
    minimum: 0

  - identifier: display_ratio
    title: Display aspect ratio
    readonly: yes

  - identifier: sample_aspect_num
    title: Sample aspect ratio numerator
    type: integer
    minimum: 0

  - identifier: sample_aspect_den
    title: Sample aspect ratio denominator
    type: integer
    minimum: 1

  - identifier: progressive
    title: Progressive
    type: integer
    minimum: 0
    maximum: 1
    widget: checkbox

  - identifier: colorspace
    title: Colorspace
    type: integer
    description: Set the video colorspace (Y'CbCr only).
    values:
      - 240 # SMPTE 240M
      - 601 # ITU-R BT.601
      - 709 # ITU-R BT.709

  - identifier: frame_rate_num
    title: Frame rate numerator
    type: integer
    minimum: 0
    unit: frames/second

  - identifier: frame_rate_den
    title: Frame rate denominator
    type: integer
    minimum: 1
    unit: frames/second

  - identifier: fps
    title: Frame rate
    readonly: yes
    unit: frames/second

# These are common to all consumers.
  - identifier: deinterlacer
    title: Deinterlacer
    type: string
    default: yadif
    values:
      - greedy
      - linearblend
      - onefield
      - yadif
      - yadif-nospatial

  - identifier: rescale
    title: Image scaler
    type: string
    description: Set the pixel interpolation mode.
    values:
      - nearest
      - bilinear
      - bicubic
      - bicublin
      - gauss
      - sinc
      - lanczos
      - spline

  - identifier: frequency
    title: Audio sample rate
    type: integer
    minimum: 0
    maximum: 256000
    default: 48000
    unit: Hz

  - identifier: channels
    title: Audio channels
    type: integer
    minimum: 1
    maximum: 16
    default: 2

  - identifier: channels.0
    title: Channels on track 1
    type: integer
    description: Used to map a bundle of channels to multi-track audio.
    minimum: 0
    maximum: 16
    default: 0

  - identifier: channels.1
    title: Channels on track 2
    type: integer
    description: Used to map a bundle of channels to multi-track audio.
    minimum: 0
    maximum: 16
    default: 0

  - identifier: channels.2
    title: Channels on track 3
    type: integer
    description: Used to map a bundle of channels to multi-track audio.
    minimum: 0
    maximum: 16
    default: 0

  - identifier: channels.3
    title: Channels on track 4
    type: integer
    description: Used to map a bundle of channels to multi-track audio.
    minimum: 0
    maximum: 16
    default: 0

  - identifier: channels.4
    title: Channels on track 5
    type: integer
    description: Used to map a bundle of channels to multi-track audio.
    minimum: 0
    maximum: 16
    default: 0

  - identifier: channels.5
    title: Channels on track 6
    type: integer
    description: Used to map a bundle of channels to multi-track audio.
    minimum: 0
    maximum: 16
    default: 0

  - identifier: channels.6
    title: Channels on track 7
    type: integer
    description: Used to map a bundle of channels to multi-track audio.
    minimum: 0
    maximum: 16
    default: 0

  - identifier: channels.7
    title: Channels on track 8
    type: integer
    description: Used to map a bundle of channels to multi-track audio.
    minimum: 0
    maximum: 16
    default: 0

# These are common to all consumers and affect runtime behavior
  - identifier: terminate_on_pause
    title: File output
    type: integer
    description: Disable this for streaming.
    minimum: 0
    maximum: 1
    default: 1
    widget: checkbox

  - identifier: real_time
    title: Drop frames
    type: integer
    description: >
      Set the number of processing threads and enable frame-dropping (positive)
      or disable frame-dropping (negative).
    default: -1
    widget: spinner
    unit: threads

  - identifier: prefill
    title: Pre-roll
    type: integer
    description: Set the number of frames to buffer before starting actual output.
    minimum: 1
    default: 1
    unit: frames

  - identifier: buffer
    title: Buffer
    type: integer
    description: >
      Set the maximum number of frames to buffer - process ahead of the output
      position.
    minimum: 1
    default: 25
    unit: frames

# These are ffmpeg-compatible aliases to MLT properties
  - identifier: s
    title: Size
    type: string
    description: >
      This is a ffmpeg-compatible equivalent to the MLT profile and width and height parameters.
    format: WxH
    unit: pixels

  - identifier: aspect
    title: Aspect ratio
    type: string
    description: >
      This is a ffmpeg-compatible equivalent to the MLT profile and other aspect ratio parameters.
    format: numerator:denominator

  - identifier: deinterlace
    title: Deinterlace
    type: integer
    description: >
      This is a ffmpeg-compatible equivalent to the MLT profile and progressive parameter.
    minimum: 0
    maximum: 1

  - identifier: r
    title: Frame rate
    type: float
    description: >
      This is a ffmpeg-compatible equivalent to the MLT profile and frame rate parameters.
    minimum: 5.0

  - identifier: ac
    title: Audio channels
    type: integer
    description: >
      This is a ffmpeg-compatible equivalent to the channels parameter.
    minimum: 1
    maximum: 16
    default: 2

  - identifier: ar
    title: Audio sample rate
    type: integer
    description: >
      This is a ffmpeg-compatible equivalent to the frequency parameter.
    minimum: 0
    maximum: 256000
    default: 48000
    unit: Hz

# These are other non-AVOption parameters specific to FFmpeg.
  - identifier: threads
    title: Encoding threads
    type: integer
    minimum: 0
    maximum: 16
    default: 1
    widget: spinner
    unit: threads

  - identifier: aq
    title: Audio quality
    type: integer
    description: The meaning depends upon the codec.

  - identifier: dc
    title: Intra DC precision
    type: integer
    default: 8

  - identifier: muxdelay
    title: Muxer delay
    type: float
    description: Set the maximum demux-decode delay.
    default: 0.7
    unit: seconds

  - identifier: muxpreload
    title: Muxer preload
    type: float
    description: Set the initial demux-decode delay.
    default: 0.5
    unit: seconds

  - identifier: f
    title: Format
    type: string
    description: Use "list" to see the list of formats.
    default: mpeg

  - identifier: acodec
    title: Audio codec
    description: Use "list" to see the list of audio codecs.
    default: mp2

  - identifier: vcodec
    title: Video codec
    description: Use "list" to see the list of video codecs.
    default: mpeg2video

  - identifier: atag
    title: Audio FourCC
    type: string

  - identifier: apre
    title: Audio codec preset
    type: string

  - identifier: vpre
    title: Video codec preset
    type: string

  - identifier: fpre
    title: Format preset
    type: string

  - identifier: alang
    title: Audio language
    type: string
    description: Set the 3-character ISO 639 language code of the current audio stream.

  - identifier: pix_fmt
    title: Pixel format
    type: string
    description: >
      See 'ffmpeg -pix_fmts' to see a list of values.
      Normally, this is not required, but some codecs support multiple pixel
      formats, especially chroma bit-depth.

  - identifier: sample_fmt
    title: Audio sample format
    type: string
    description: >
      See 'ffmpeg -sample_fmts' to see a list of values.
      Normally, this is not required, but some codecs support multiple sample
      formats, especially bit-depth and planar vs. interleaved.
      This is evaluated at a lower priority than mlt_audio_format.

  - identifier: qscale
    title: Video quantizer
    type: float
    description: Set a fixed video quantizer scale for constant quality VBR output.

  - identifier: vtag
    title: Video FourCC
    type: string

  - identifier: rc_override
    title: Rate control
    type: string
    format: start_frame,end_frame,qscale/...
    description: This is an override for specific intervals.

  - identifier: pass
    title: Pass
    type: integer
    description: Select the pass number for two-pass encoding.
    minimum: 1
    maximum: 2

  - identifier: passlogfile
    title: Two-pass log file
    type: string

  - identifier: vb
    title: Video bitrate
    type: string
    unit: bits/second
    description: >
      Normally this is an integer, but you can append a K suffix for convenience.
    minimum: 0

  - identifier: ab
    title: Audio bitrate
    type: string
    unit: bits/second
    description: >
      Normally this is an integer, but you can append a K suffix for convenience.

  - identifier: an
    title: Disable audio
    type: integer
    minimum: 0
    maximum: 1
    widget: checkbox

  - identifier: vn
    title: Disable video
    type: integer
    minimum: 0
    maximum: 1
    widget: checkbox
