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• 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

• Asking ffmpeg to extract frames at the original frame rate

  28 septembre 2011, par intrpc

  On the ffmpeg documentation (here, and here) I read that, by default, ffmpegchoses to extract frames at 25 frames per second (otherwise you can specify a framerate with the -r option)

  My problem is that I have a folder with dozens of videos, each of them recorded at different frame rates, so my question is :

  Is there a way to ask ffmpeg to extract frames from a video at the "native" frame rate (i.e. the original frame rate at which the video was recorded) ?

  In case it matters, I am working with MP4 files

• Is -vfilter not available on Debian 5 ?

  3 octobre 2011, par Kor

  I'm getting problems trying to make my website (done in PHP) work online.
  At a specific time, I need to upload a video and convert it, also scaling its dimensions. I use a call like this one :

  ffmpeg -y -i '/path/to/video.mp4' -f flv -ab 56 -ar 22050 -r 20 -vfilter "scale=704:-1" '/path/to/new/video.flv'

  It works offline on my computer (Ubuntu 10.10), but it doesn't do the same online (Debian Lenny 5.0). The response I get from the server is :

  [Mon Oct 03 15:48:56 2011] [error] [client 81.184.6.124] /servers/path/to/ffmpeg: unrecognized option '-vfilter'

  I have also tried with '-vf', but it just doesn't work at all. So my question is, am I doing it wrong, or is it that Debian unables video filters for some reason ?

  I give you some info about this server :

  Debian 5.0
  
  PHP: 5.2.6
  
  FFmpeg r11872+debian_0.svn20080206-18+lenny1
  
  libavutil   3212800
  
  libavcodec  3355136
  
  libavformat 3409664
  
  libavdevice 3407872

  EDIT : Oh my, I just saw it. No libavfilter installed. I'll tell you what their support tells me in a couple hours.