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I am trying to convert a mp4 file into flv with 2 audio channels & sample rate of 44.1 Khz (because .flv does not allow higher than that). Here is the pastebin for the error. As seen from the console output, I am using the latst build of ffmpeg.

Chantz
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3 Answers3

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The problem is you are resampling. Ffmpeg doesn't support resampling for 5+1 input channels, only for mono and stereo. Try converting it without specifying a sample rate and it might work. So try omitting the sample rate, that way the audio won't be resampled. Alternatively you might try just copying the audio stream (use -vcodec copy). Again the audio won't be resampled. You might also try first converting it to 2 channels intermediate file, and then resampling, but I'm not sure if this will work.

sashoalm
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  • Ok. I think the problem if I dont mention any sample rate is that flv supports only 3 audio sample rates, 44.1 Khx being the highest. If I dont mention it might cause an error on unsupported sampling rate. – Chantz Feb 09 '11 at 15:46
  • Actually I just checked it out and gave the error when I did not specify any sampling rate. Here is the error > http://pastebin.com/8n2Eavt7 – Chantz Feb 09 '11 at 15:48
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    See this link: http://muzso.hu/2009/02/25/downsampling-multichannel-audio-5.1-into-stereo-2-channels-with-ffmpeg. I haven't tried it so I don't know if it really works, but it might help you. – sashoalm Feb 09 '11 at 17:25
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You need a newer version of FFMPEG. I got mine by downloading WinFF from Video Help over at http://www.videohelp.com/software/WinFF then I proceeded to use the ffmpeg.exe that the front end came with.

Axonn
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I had the same issue when I've installed ffmpeg from RPM, but then I took the lates version from here and it worked like a charm!

One note though, some flags have been changed, for example -sameq should be -qscale 0 when using the new version, so keep in mind that it needs to be tested well before using it on production environments.

Kuf
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