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• Extract PRORES Video with 5.1 audio from file with Mono and downmix

  29 mars 2021, par user2920456

  I am trying to extract a prores video with just 5.1 audio from a Prores with the below audio track layout. How can I do that using the FFmpeg library ?

  


  I could not figure out which command to use from the below ffmpeg library spec
https://trac.ffmpeg.org/wiki/AudioChannelManipulation#a2monostereo

  


  Desired Output PRORES to contain below track layout

  


  

  • track 0 - video (src Stream #0:0)

  


  • track 1 - FL (src Stream #0:1)

  


  • track 2 - FR (src Stream #0:2)

  


  • track 3 - FC (src Stream #0:3)

  


  • track 4 - LFE (src Stream #0:4)

  


  • track 5 - BL (src Stream #0:5)

  


  • track 6 - BR (src Stream #0:6)

  


  • track 7 - tmcd (src Stream #0:8)

  


  


  Below is the source video/audio Track Layout

  


  Stream #0:0(eng): Video: prores (HQ) (apch / 0x68637061), yuv422p10le(tv, bt709, progressive), 1920x1080, 171944 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 23976 tbn, 23976 tbc (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Video Media Handler
      encoder         : Apple ProRes 422 HQ
    Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (FL), s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:2(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (FR), s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:3(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:4(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (LFE), s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:5(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (BL), s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:6(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (BR), s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:7(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, downmix, s32 (24 bit), 2304 kb/s (default)
    Metadata:
      creation_time   : 2019-05-21T01:26:51.000000Z
      handler_name    : Apple Sound Media Handler
    Stream #0:8(eng): Data: none (tmcd / 0x64636D74) (default)
    Metadata:
      creation_time   : 2020-03-17T19:58:52.000000Z
      handler_name    : Time Code Media Handler
      reel_name       :
      timecode        : 00:00:00:00


  


• Adding an audio track to a video using it's own audio as a source ?

  29 novembre 2016, par user41997

  I have a video file with the following layout :

  • Video
  • DTS audio

  What I would like to do is :

  • Video
  • AAC audio (converted from the DTS source)
  • DTS audio

  I can’t wrap my head around the FFMPEG command I would need to do this, though, since I would need to convert the DTS audio to AAC and then place it ahead of the DTS track. The reason for this is the PS4 media player currently doesn’t let you select audio tracks and it only plays the first one it sees. It doesn’t support DTS audio but I’d like to keep it around.

• mlp_parser : Drop in-parser downmix functionality

  26 avril 2017, par Vittorio Giovara

  mlp_parser : Drop in-parser downmix functionality
  request_channel_layout is a decoder option and it makes no sense
  
  to have it in a parser.
  This feature was needed in the past when the decoder was allowed
  
  to reuse the avctx from the demuxer. Nowadays the decoder receives
  
  only the parameters from it, already containing the real channel
  
  layout (and the correct request_channel_layout option).
  After initialization the decoder overwrites the channel layout
  
  with the downmixed one that is actually output, so there is no need
  
  to preserve this functionality in the parser.
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DBH] libavcodec/mlp_parser.c
  • [DBH] libavcodec/mlp_parser.h
  • [DBH] libavcodec/mlpdec.c