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• FFMpeg How to extract individual audio channels from wav/.w64 and insert in .mxf with track tags

  11 septembre 2018, par Vince

  Hi my problem is I have 2 .w64 files (extended wav format) each file has 16 mono channels of audio. I want to be able to extract specific channels of audio from each of those .w64 files and insert those channels into an .mxf file as separate single channel mono audio streams and to be additionally able to set the Tag information on those audio streams. I have tried using -map and so on but it seems to take all the channels from the .w64 files and insert a single audio stream of 16 channels. I apologise in advance as I’m very new to ffmpeg and thanks in advance for any advice any of you can offer. This is all specific to command line usage on windows.
  All the best

  ffmpeg -i "D :\Media\AUDIO_0.W64" -i "D :\media\NO_AUDIO.mxf" -c copy -map 0:0:0 -map 0:0:1 -map 0:0:2 -acodec pcm_s24le -map 1:0 "D :\media\out.mxf"

  ffmpeg version N-67838-g4388e78 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Nov 19 2014 22:02:08 with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  
  enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-lib
  
  modplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
  
  b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
  
  r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --en
  
  able-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
  
   --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
  
  libx265 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      54. 14.100 / 54. 14.100
  
    libavcodec     56. 12.101 / 56. 12.101
  
    libavformat    56. 14.100 / 56. 14.100
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [w64 @ 0481c580] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, w64, from 'D:\Media\AUDIO_0.W64':
  
    Duration: 00:01:02.56, bitrate: 18432 kb/s
  
      Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 16 channels
  
  , s32 (24 bit), 18432 kb/s
  
  [mxf @ 048890e0] index entry 1564 + TemporalOffset 1 = 1565, which is out of bou
  
  nds
  
  Input #1, mxf, from 'D:\media\NO_AUDIO.mxf':
  
    Metadata:
  
      uid             : adab4424-2f25-4dc7-92ff-29bd000c0000
  
      generation_uid  : adab4424-2f25-4dc7-92ff-29bd000c0001
  
      company_name    : FFmpeg
  
      product_name    : OP1a Muxer
  
      product_version : 57.56.100
  
      product_uid     : adab4424-2f25-4dc7-92ff-29bd000c0002
  
      modification_date: 0000-01-01 00:00:00
  
      timecode        : 00:00:00:00
  
    Duration: 00:01:02.60, start: 0.000000, bitrate: 2404 kb/s
  
      Stream #1:0: Video: mpeg2video (4:2:2), yuv422p(tv), 1920x1080 [SAR 1:1 DAR16:9], max. 50000 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
  File 'D:\media\out.mxf' already exists. Overwrite ? [y/N] y
  
  
  
  [mxf @ 04891c60] there must be exactly one video stream and it must be the first
  
   one
  
  Output #0, mxf, to 'D:\media\out.mxf':
  
    Metadata:
  
      encoder         : Lavf56.14.100
  
      Stream #0:0: Audio: pcm_s24le, 48000 Hz, 16 channels, s32 (24 bit), 18432 kb/s
  
      Metadata:
  
        encoder         : Lavc56.12.101 pcm_s24le
  
      Stream #0:1: Audio: pcm_s24le, 48000 Hz, 16 channels, s32 (24 bit), 18432 kb/s
  
      Metadata:
  
        encoder         : Lavc56.12.101 pcm_s24le
  
      Stream #0:2: Audio: pcm_s24le, 48000 Hz, 16 channels, s32 (24 bit), 18432 kb/s
  
      Metadata:
  
        encoder         : Lavc56.12.101 pcm_s24le
  
      Stream #0:3: Video: mpeg2video, yuv422p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, max. 50000 kb/s, 25 fps, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s24le (native) -> pcm_s24le (native))
  
    Stream #0:0 -> #0:1 (pcm_s24le (native) -> pcm_s24le (native))
  
    Stream #0:0 -> #0:2 (pcm_s24le (native) -> pcm_s24le (native))
  
    Stream #1:0 -> #0:3 (copy)
  
  
  
  Could not write header for output file #0 (incorrect codec parameters ?): Error
  
  number -1 occurred

• Can ffmpeg log a output of histogram and wavetransform ?

  5 février 2018, par jay

  ffmpeg has an option of showing a color histogram and a wavetransform which is from sound data on a screen.

  I want to collect them as text form pushing into a log file and later can check with linux text parser tools.

  For example, Assuming some of videos has a period of black screen as it plays.
  Then it is easy to find out that ’when does video has a period of black ?’ or ’which video file has a period of black ?’ by YCbCr histogram log.

  is it possible ? I have looked ffmpeg document but couldn’t find it.

• ffmpeg Muxing Recovered Files - Audio dropping

  7 avril 2020, par Chris McL

  A few years ago, we accidentally deleted all our home movies. We recovered the files from the camera. They have lost their headers and are not playable. I have used a recovery program (recover_mp4) to get an h264 and aac file.

  



  When I try to mux these together, the audio drops off from the stream. It also crackles badly at times. If I play the AAC file by itself, it sounds fine. For some movies, the audio works for a while, on others it drops out quickly.

  



  One thing I noticed is that the resulting muxed mp4 file is often shorter than the audio.

  



  I've tried various ffmpeg commands that look generally like this :

  



  ffmpeg -r 30000/1001 -i recovered_video.h264 -i recovered_audio -bsf:a aac_adtstoasc -c:v copy -c:a copy output.mp4

  



  Any ideas on how to marry the two files together ?