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• How to swtich audio stream with ffmpeg ?

  6 octobre 2022, par Jason

  I have a file which has both english and japanese audio tracks. This is the meta data of the file (using command ffmpeg -i "my_vid.mp4" :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'my_vid.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.76.100
  Duration: 00:27:13.14, start: 0.000000, bitrate: 1699 kb/s
  Chapters:
    Chapter #0:0: start 0.000000, end 263.012000
      Metadata:
        title           : Chapter 01
    Chapter #0:1: start 263.012000, end 353.019000
      Metadata:
        title           : Chapter 02
    Chapter #0:2: start 353.019000, end 891.098000
      Metadata:
        title           : Chapter 03
    Chapter #0:3: start 891.098000, end 1535.075000
      Metadata:
        title           : Chapter 04
    Chapter #0:4: start 1535.075000, end 1624.080000
      Metadata:
        title           : Chapter 05
    Chapter #0:5: start 1624.080000, end 1633.140000
      Metadata:
        title           : Chapter 06
  Stream #0:0[0x1](und): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv), 1920x1080 [SAR 1:1 DAR 16:9], 1413 kb/s, 23.98 fps, 23.98 tbr, 16k tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 136 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](jpn): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 137 kb/s
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:3[0x4](eng): Data: bin_data (text / 0x74786574)
    Metadata:
      handler_name    : SubtitleHandler


  


  Per the ffmpeg documentation I'm trying to switch the video's audio output to japanese. However, the output video is still in english (which it was in before). This is my current ffmpeg cmd :

  


  ffmpeg -i "my_vid.mp4" -c copy -disposition:a:1 default "output.mp4"


  


  what am I doing wrong ? Still pretty new to ffmpeg

  


  Edit :

  


  With one of the suggestions I tried adding the -map 0 option to my command

  


  ffmpeg -i "my_vid.mp4" -map 0 -c copy -disposition:a:2 default "output.mp4"


  


  but still not change. The meta data for the output video is as follows :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf59.33.100
  Duration: 00:27:13.14, start: 0.000000, bitrate: 1699 kb/s
  Chapters:
    Chapter #0:0: start 0.000000, end 263.012000
      Metadata:
        title           : Chapter 01
    Chapter #0:1: start 263.012000, end 353.019000
      Metadata:
        title           : Chapter 02
    Chapter #0:2: start 353.019000, end 891.098000
      Metadata:
        title           : Chapter 03
    Chapter #0:3: start 891.098000, end 1535.075000
      Metadata:
        title           : Chapter 04
    Chapter #0:4: start 1535.075000, end 1624.080000
      Metadata:
        title           : Chapter 05
    Chapter #0:5: start 1624.080000, end 1633.140000
      Metadata:
        title           : Chapter 06
  Stream #0:0[0x1](und): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv), 1920x1080 [SAR 1:1 DAR 16:9], 1413 kb/s, 23.98 fps, 23.98 tbr, 16k tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 136 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](jpn): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 137 kb/s
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:3[0x4](eng): Data: bin_data (gpmd / 0x646D7067)
    Metadata:
      handler_name    : SubtitleHandler
  Stream #0:4[0x5](eng): Data: bin_data (text / 0x74786574)
    Metadata:
      handler_name    : SubtitleHandler


  


• fftools/ffmpeg : store forced keyframe pts in AV_TIME_BASE_Q

  17 novembre 2022, par Anton Khirnov

  fftools/ffmpeg : store forced keyframe pts in AV_TIME_BASE_Q
  Rather than the encoder timebase. Since the times are parsed as
  
  microseconds, this will not reduce precision, except possibly when
  
  chapter times are used and the chapter timebase happens to be better
  
  aligned with the encoder timebase, which is unlikely.
  This will allow parsing the keyframe times earlier (before encoder
  
  timebase is known) in future commits.
  

  • [DH] fftools/ffmpeg.c
  • [DH] fftools/ffmpeg.h

• doc/developer.texi : refine the "contributing code" section

  9 novembre 2022, par Anton Khirnov

  doc/developer.texi : refine the "contributing code" section
  Drop the reference to directly committing code, because
  
   it is highly discouraged and very rarely done these days
  
   there is no good reason NOT to submit patches for review
  Add a link to the development policy chapter.
  

  • [DH] doc/developer.texi