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I`ve already asked how to do it with ffmpeg but nobody replied. Maybe anybody know how to convert from mjpeg format? Do not suggest to use virtual dub to convert to avi as all it does is putting mjpeg inside avi container and I need to convert from mjpeg to some other format like mpeg or flv.

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  • What is the second format? It's gotten garbled somehow
    – Dan Walker
    Commented Aug 27, 2009 at 3:58
  • ref to the other question: superuser.com/questions/29893/…
    – nik
    Commented Aug 27, 2009 at 4:10
  • yes, and theres no answer, thats why I reposted and without asking to convert with ffmpeg only.
    – Yaroslav Yakovlev
    Commented Aug 27, 2009 at 4:19
  • Can you please post a link to a sample file? Its hard to figure out ffmpeg options w/o a file to work with.
    – derobert
    Commented Aug 27, 2009 at 5:06
  • link to file : onlinedisk.ru/file/205435
    – Yaroslav Yakovlev
    Commented Aug 27, 2009 at 6:34

1 Answer 1

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Your problem with that file is actually the audio sampling rate, 11024 Hz isn't supported by MP3. Easy enough to fix:

ffmpeg -i MVI_2130.avi -ar 11025 test.flv

Of course, there are a lot of quality options you may want to set, such as the video (-vb) and audio (-ab) bitrates.

The ffmpeg output actually told you this:

FFmpeg version SVN-r19468, Copyright (c) 2000-2009 Fabrice Bellard, et al.
⋮
Output #0, flv, to 'test.flv':
    Stream #0.0: Video: flv, yuv420p, 320x240, q=2-31, 200 kb/s, 90k tbn, 15 tbc
    Stream #0.1: Audio: libmp3lame, 11024 Hz, 1 channels, s16, 64 kb/s
⋮
Error while opening encoder for output stream #0.1 - […]

Note how the error was with stream #0.1, which is the audio stream. It (unfortunately!) doesn't tell you that the sample rate is wrong; you just have to know what your output codec is capable of. And for mp3, that's 8000, 11025, 12000, 22050, 24000, 32000, 44100, and 48000 Hz according to Wikipedia.

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  • Thanks, it really does video conversion now. But sound conversion failed and the result file is silent. Can it be fixed in some way?
    – Yaroslav Yakovlev
    Commented Aug 27, 2009 at 7:24
  • Sound conversion worked just fine here... Did ffmpeg give any errors?
    – derobert
    Commented Aug 27, 2009 at 13:39
  • Just copied from stream mapping: Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 Press [q] to stop encoding Warning, using s16 intermediate sample format for resampling [libmp3lame @ 0x3df830]lame: output buffer too small (buffer index: 8359, free b ytes: 1433) Audio encoding failed
    – Yaroslav Yakovlev
    Commented Aug 30, 2009 at 12:03
  • Weird, what version of ffmpeg are you using?
    – derobert
    Commented Sep 1, 2009 at 5:29

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