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• Audacity vocal removal failed when ffmpeg-conversion was involved

  10 mars 2018, par fyang

  I downloaded some songs coded with FLAC, and Audacity could remove the vocals quite well.

  When I downloaded songs coded with ALAC, I must use ffmpeg to convert them to some other forms because Audacity didn’t recognise .m4a files.

  I used the command ffmpeg -i "song 01.m4a" -f flac "song 01.flac". Now Audacity could load the song, but its vocal removal failed to remove the vocals.

  I tried again with this command in order to be precise, ffmpeg -i "song 01.m4a" -af "pan=stereo|c0=c0|c1=c1" -f flac "song 01.flac", and vocal removal did not work either.

  I tried to do it manually by splitting, inverting and changing both channels to mono, but the vocals were still there.

  I think the problem lies with the ffmpeg conversion step. Is there any fix ? Thanks !

  Below is the result of the conversion :

  ffmpeg -i "song 01.m4a" -af "pan=stereo|c0=c0|c1=c1" -f flac "song 01.flac"
  
  ffmpeg version N-90143-gb6652f5100 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-amf --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
  
    libavutil      56.  7.101 / 56.  7.101
  
    libavcodec     58. 12.102 / 58. 12.102
  
    libavformat    58.  9.100 / 58.  9.100
  
    libavdevice    58.  2.100 / 58.  2.100
  
    libavfilter     7. 12.100 /  7. 12.100
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0000019f2b258000] stream 0, timescale not set
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'song 01.m4a':
  
    Metadata:
  
      major_brand     : M4A
  
      minor_version   : 0
  
      compatible_brands: M4A mp42isom
  
      creation_time   : 2009-12-27T00:15:23.000000Z
  
      track           : 1/10
  
      genre           : 
  
      album           : 
  
      artist          : 
  
      comment         : ExactAudioCopy v0.95b4
  
      DISCID          : 
  
      iTunNORM        :  00000F32 00000E1D 0000547D 00005B93 0006C3CA 0006C43E 00007FF8 00007FFF 00058227 0003593B
  
      title           : song 01
  
      encoder         : iTunes 9.0.2.25
  
      date            : 2005
  
      album_artist    : 
  
      lyrics          : 
  
    Duration: 00:08:10.84, start: 0.000000, bitrate: 921 kb/s
  
      Stream #0:0(und): Audio: alac (alac / 0x63616C61), 44100 Hz, stereo, s16p, 920 kb/s (default)
  
      Metadata:
  
        creation_time   : 2009-12-27T00:15:23.000000Z
  
      Stream #0:1: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 300x300 [SAR 100:100 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (alac (native) -> flac (native))
  
  Press [q] to stop, [?] for help
  
  [Parsed_pan_0 @ 0000019f2b2a6fc0] Pure channel mapping detected: 0 1
  
  Output #0, flac, to 'song 01.flac':
  
    Metadata:
  
      major_brand     : M4A
  
      minor_version   : 0
  
      compatible_brands: M4A mp42isom
  
      lyrics          : 
  
      TRACKNUMBER     : 1/10
  
      genre           : 
  
      album           : 
  
      artist          : 
  
      DESCRIPTION     : ExactAudioCopy v0.95b4
  
      DISCID          : 
  
      iTunNORM        :  00000F32 00000E1D 0000547D 00005B93 0006C3CA 0006C43E 00007FF8 00007FFF 00058227 0003593B
  
      title           : song 01
  
      ALBUMARTIST     : 
  
      date            : 2005
  
      encoder         : Lavf58.9.100
  
      Stream #0:0(und): Audio: flac, 44100 Hz, stereo, s16, 128 kb/s (default)
  
      Metadata:
  
        creation_time   : 2009-12-27T00:15:23.000000Z
  
        encoder         : Lavc58.12.102 flac
  
  size=   54518kB time=00:08:10.84 bitrate= 909.9kbits/s speed=  35x
  
  video:0kB audio:54508kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.018294%

• FFMPEG Concat protocol Error : Found duplicated MOOV Atom. Skipped it

  11 septembre 2020, par user3541092

  I'm concatenating mp3 files into a single m4a.

  



  To save time, I'm doing the mp3 to m4a conversion first (multi-threaded) and then concatenating the output files (m4a) into a single m4a file.

  



  The concat works when I do the conversion (mp3 -> m4a) and cancat in one swoop. But it takes forever to run.

  



  Example :

  



  ffmpeg -i "concat:001.mp3|002.mp3|003.mp3" -codec:a aac -c copy output.m4a


  



  
If I take those same mp3 files and convert them to m4a in parallel and then concat, I can save myself a significant amount time.

  



  The problem is if I run the concat command on the converted m4a files

  



  Example cmd :

  



  ffmpeg -i "concat:001.m4a|002.m4a|003.m4a" -c copy output.m4a


  



  I getting the following error :

  



  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000052f680] Found duplicated MOOV
 Atom. Skipped it

  


  



  
UPDATE : Ouput when concatenating m4a files (two track example) :

  



  C:\_ffmpeg>ffmpeg -i "concat:001.m4a|002.m4a" -c copy output.m4a
ffmpeg version N-79630-g9ac154d Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (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-libmfx --enable-libmp3lame --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enabl
e-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable
-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --ena
ble-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx
264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable
-lzma --enable-decklink --enable-zlib
  libavutil      55. 22.101 / 55. 22.101
  libavcodec     57. 38.100 / 57. 38.100
  libavformat    57. 34.103 / 57. 34.103
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 44.100 /  6. 44.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000048a9a0] Found duplicated MOOV Atom. Skipped
 it
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'concat:001.m4a|002.m4a':
  Metadata:
    track           : 1
    major_brand     : M4A
    minor_version   : 512
    title           : 001 Moon Over Soho
    artist          : Ben Aaronovitch
    album_artist    : Narrated by Kobna Holdbrook-Smith
    composer        : Narrated by Kobna Holdbrook-Smith
    album           : Moon Over Soho
    date            : 2012
    encoder         : Lavf57.34.103
    genre           : Speech
    copyright       : Tantor Audio
    compatible_brands: isomiso2
  Duration: 00:44:03.83, start: 0.000000, bitrate: 251 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, flt
p, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[ipod @ 000000000048bb20] Using AVStream.codec to pass codec parameters to muxer
s is deprecated, use AVStream.codecpar instead.
Output #0, ipod, to 'output.m4a':
  Metadata:
    track           : 1
    major_brand     : M4A
    minor_version   : 512
    title           : 001 Moon Over Soho
    artist          : Ben Aaronovitch
    album_artist    : Narrated by Kobna Holdbrook-Smith
    composer        : Narrated by Kobna Holdbrook-Smith
    album           : Moon Over Soho
    date            : 2012
    compatible_brands: isomiso2
    genre           : Speech
    copyright       : Tantor Audio
    encoder         : Lavf57.34.103
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, 128
 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=   41892kB time=00:44:03.80 bitrate= 129.8kbits/s speed=2.21e+003x
video:0kB audio:41445kB subtitle:0kB other streams:0kB global headers:0kB muxing
 overhead: 1.077122%

C:\_ffmpeg>pause
Press any key to continue . . .


  


• FFMPEG to fluent ffmpeg [on hold]

  16 janvier 2018, par Minh

  I use ffmpeg command on VPS but I want cover to github . Help me
  This is code

  ffmpeg - re - i http: //storage.livefb.com.vn/assets/video/video_307_1516075122469280.mp4 -i assets/bg/13.png -i assets/logo.png -filter_complex "[0:v][1:v] overlay=x=4:y=H-h:enable='between(t,0,t)' [tmp]; [tmp][2:v] overlay=x=14:y=H-h-10:enable='between(t,0,t)',drawtext=fontfile=assets/thanh.ttf:y=h-60:x=158:text='TDL AUTOFB INBOXFB LIVEFB
  
    0965367062 MINH THU ':fontcolor=white:fontsize=36,drawbox=enable='
  
  between(t, 2, 10)
  
  ':y=ih-ih/2:color=black@0.8:width=iw:height=50:t=max,drawtext=enable='
  
  between(t, 2, 10)
  
  ':fontfile=assets/thanh.ttf:y=h-h/2+10:x=(w-text_w)/2:text='
  
  được phát bởi livefb liên hệ minh thư để được hỗ trợ ':fontcolor=white:fontsize=30" -vcodec libx264 -pix_fmt yuv420p -r 30 -g 60 -b:v 1400k -profile:v main -level 3.1 -acodec libmp3lame -b:a 128k -ar 44100 -metadata title="" -metadata artist="" -metadata album_artist="" -metadata album="" -metadata date="" -metadata track="" -metadata genre="" -metadata publisher="" -metadata encoded_by="" -metadata copyright="" -metadata composer="" -metadata performer="" -metadata TIT1="" -metadata TIT3="" -metadata disc="" -metadata TKEY="" -metadata TBPM="" -metadata language="eng" -metadata encoder="" -threads 0 -preset superfast -f flv "rtmp://live-api.facebook.com:80/rtmp/187884241800146?ds=1&a=ATgAYCPa1TJeWa2t"