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• MOOV atom not found - is there a way how to extract the audio from corrupted mp4 ?

  25 janvier 2021, par JZK

  I'm trying to recover mp4 video file. Having a video would be nice, having an audio is crucial.
I've recorded the fottage with LG v30 which has some kind of HQ audio, therefore normal recovery software is unable to recover it (video was recovered with ease).

  


  That's why I want to try different approach - separate audio from video already from an corrupted file.

  


  but, I'm hitting the "MOOV atom not found" problem, using FFmpeg command

  


  ffmpeg -i sample.avi -q:a 0 -map a sample.mp3


  


  Please help me. Thank you

  


• avformat/mov_chan : never override number of channels based on chan atom

  29 janvier 2024, par Marton Balint

  avformat/mov_chan : never override number of channels based on chan atom
  The channel designation metadata should not override the number of channels.
  
  Let's warn the user if it is inconsistent, and keep the channel layout
  
  unspecified.
  Before the conversion to the channel layout API the code only set the mask, but
  
  never overridden the channel count, so this restores the old behaviour.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/mov_chan.c

• How can select only two audio streams in a video and feed it to the ebur128 filter wiithin ffmpeg ?

  18 avril 2017, par Edwin

  I want to use FFmpeg to analyze the loudness of an MXF video file.
  I have an MXF file with 8 mono audio streams. I only want to feed the first two streams through the ebur128 filter. But I can’t find a way to do that. The FFmpeg documentation is not clear to me, as I am fairly new to FFmpeg.

  I tried several things :

  ffmpeg -i source.mxf -nostats -filter_complex ebur128=dualmono=true:panlaw=-3.01dB -f null -

  I am sure it’s just that I don’t have the filtering syntax right. But hey... I’m a newbie...

  ---

  ffmpeg -i myVideo.mxf -nostats -filter_complex [0:a:0][0:a:1]amerge; ebur128=dualmono=true:panlaw=-3.01 -f null -

  And this is the resulting console output :

  ffmpeg version 2.8.6 Copyright (c) 2000-2016 the FFmpeg developers
  
  built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  
  configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-        pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
  
  libavutil      54. 31.100 / 54. 31.100
  
  libavcodec     56. 60.100 / 56. 60.100
  
  libavformat    56. 40.101 / 56. 40.101
  
  libavdevice    56.  4.100 / 56.  4.100
  
  libavfilter     5. 40.101 /  5. 40.101
  
  libswscale      3.  1.101 /  3.  1.101
  
  libswresample   1.  2.101 /  1.  2.101
  
  libpostproc    53.  3.100 / 53.  3.100
  
  
  
  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Guessed Channel Layout for  Input Stream #0.2 : mono
  
  Guessed Channel Layout for  Input Stream #0.3 : mono
  
  Guessed Channel Layout for  Input Stream #0.4 : mono
  
  Guessed Channel Layout for  Input Stream #0.5 : mono
  
  Guessed Channel Layout for  Input Stream #0.6 : mono
  
  Guessed Channel Layout for  Input Stream #0.7 : mono
  
  Guessed Channel Layout for  Input Stream #0.8 : mono
  
  Input #0, mxf, from 'myVideo.mxf':
  
  Metadata:
  
  uid             : a727a381-1f5a-11e7-bdc8-18af61b92a5a
  
  generation_uid  : a727a382-1f5a-11e7-9a04-18af61b92a5a
  
  company_name    : Adobe Systems Incorporated
  
  product_name    : Adobe Media Encoder
  
  product_version : 11.0.2
  
  application_platform: Mac OS X
  
  product_uid     : 0c3919fe-46e8-11e5-a151-feff819cdc9f
  
  modification_date: 2017-04-12 08:33:07
  
  material_package_umid: 0x060A2B340101010501010D1113000000A0C9D501557805A5DF7018AF61B92A5A
  
  timecode        : 00:00:00:00
  
  Duration: 00:05:24.08, start: 0.000000, bitrate: 59986 kb/s
  
  Stream #0:0: Video: mpeg2video (4:2:2), yuv422p(tv, unknown/bt709/bt709), 1920x1080 [SAR 1:1 DAR 16:9], 50000 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:1: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:2: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:3: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:4: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:5: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:6: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:7: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Stream #0:8: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  Metadata:
  
    file_package_umid: 0x060A2B340101010501010D12133A5D15A0C9D501557805A5B09318AF61B92A5A
  
    file_package_name: Source Package
  
  Filter amerge has a unconnected output
  
  
  
  bash: -f: command not found

  I changed the name of the video to myVideo.mxf.