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• Why does FFMPEG reports the wrong duration ?

  20 octobre 2011, par Adrian Lynch

  I have an oldish build of FFMPEG that I can't easily change.

  We use FFMPEG to find the duration of video and sound files. So far it has been working wonderfully.

  Recently on an uploaded file, FFMPEG has reported a 30 second file as being 5 minutes 30 seconds in length.

  Could it be something wrong with the file rather than FFMPEG ?

  If I use FFMPEG to convert to another file, the duration is restored.

  In case it matters, ffmpeg -i 'path to the file' produces :

      FFmpeg version Sherpya-r15618, Copyright (c) 2000-2008 Fabrice Bellard, et al.
        libavutil     49.11. 0 / 49.11. 0
        libavcodec    52. 0. 0 / 52. 0. 0
        libavformat   52.22. 1 / 52.22. 1
        libavdevice   52. 1. 0 / 52. 1. 0
        libswscale     0. 6. 1 /  0. 6. 1
        libpostproc   51. 2. 0 / 51. 2. 0
        built on Oct 14 2008 23:43:47, gcc : 4.2.5 20080919 (prerelease) [Sherpya]
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'H :\path\to\file.mov' :
        Duration : 00:05:35.00, start : 0.000000, bitrate : 1223 kb/s
          Stream #0.0(eng) : Audio : aac, 44100 Hz, stereo, s16
          Stream #0.1(eng) : Video : h264, yuv420p, 720x576, 25.00 tb(r)
      Must supply at least one output file
  

  It's that very command I use to then extract the duration with RegEx.

  Does anyone have a nice application that can do what I'm trying above but get it right 100% of the time ?

• What codec do I need to convert .wav to .mp3 with ffmpeg ?

  19 septembre 2011, par LedZeppelin

  I am able to convert from .mp3 files to .wav files.

  me@me-desktop:~$ ffmpeg -i Desktop/input.mp3 Desktop/output.wav
  
  FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1.1, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --extra-version=4:0.5.1-1ubuntu1.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
  
    libavutil     49.15. 0 / 49.15. 0
  
    libavcodec    52.20. 1 / 52.20. 1
  
    libavformat   52.31. 0 / 52.31. 0
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Mar 31 2011 18:53:20, gcc: 4.4.3
  
  [mp3 @ 0x9449510]mdb:511, lastbuf:0 skipping granule 0
  
      Last message repeated 1 times
  
  [mp3 @ 0x9449510]mdb:511, lastbuf:0 skipping granule 1
  
      Last message repeated 1 times
  
  Input #0, mp3, from 'Desktop/input.mp3':
  
    Duration: 00:04:45.31, start: 0.000000, bitrate: 256 kb/s
  
      Stream #0.0: Audio: mp3, 48000 Hz, stereo, s16, 256 kb/s
  
  Output #0, wav, to 'Desktop/output.wav':
  
      Stream #0.0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press [q] to stop encoding
  
  [mp3 @ 0x9449510]mdb:511, lastbuf:0 skipping granule 0
  
      Last message repeated 1 times
  
  [mp3 @ 0x9449510]mdb:511, lastbuf:0 skipping granule 1
  
  size=   42944kB time=229.03 bitrate=1536.0kbits/s    
  
  video:0kB audio:42944kB global headers:0kB muxing overhead 0.000100%

  However when I try to convert the same .wav file back to an .mp3 I get the following error : Unsupported codec for output stream #0.0

  me@me-desktop:~$ ffmpeg -i Desktop/output.wav Desktop/output2.mp3
  
  FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1.1, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --extra-version=4:0.5.1-1ubuntu1.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
  
    libavutil     49.15. 0 / 49.15. 0
  
    libavcodec    52.20. 1 / 52.20. 1
  
    libavformat   52.31. 0 / 52.31. 0
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Mar 31 2011 18:53:20, gcc: 4.4.3
  
  Input #0, wav, from 'Desktop/output.wav':
  
    Duration: 00:03:49.03, bitrate: 1536 kb/s
  
      Stream #0.0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
  
  Output #0, mp3, to 'Desktop/output2.mp3':
  
      Stream #0.0: Audio: 0x0000, 48000 Hz, stereo, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Unsupported codec for output stream #0.0

  I've already tried installing unstripped-51 per a suggestion from a previous question but I am still unable to convert from .wav to .mp3

• Revision 4664b219a2 : vp9_ratectrl : change ARF overlays rate correction factor ARF overlays now use t

  6 avril 2014, par Guillaume Martres

  Changed Paths :
   Modify /vp9/encoder/vp9_ratectrl.c

  
  
  vp9_ratectrl : change ARF overlays rate correction factor

  ARF overlays now use the same rate correction factor as regular inter
  frames, further testing would be needed to see if it makes sense to use
  a completely separate rate correction factor for ARF overlays.

  $ vpxenc —cpu-used=5 —fps=50/1 —target-bitrate=2000
  parkjoy.y4m -o out.webm
  => Before : 3356 kb/s
  => After : 2271 kb/s

  Change-Id : I73e4defa615ba7a8a2bdb845864f4b1721cbbffe