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I used this below mentioned cmd to compress an avi file(using ubuntu) 

ffmpeg -i input.avi -vcodec msmpeg4v2 output.avi

but I am getting these errors

Incompatible sample format 's16' for codec 'ac3', auto-selecting format 'flt'
[ac3 @ 0x9cd1fa0] invalid bit rate

Error while opening encoder for output stream #0.1 - maybe incorrect      
parameters such as bit_rate, rate, width or height

What's wrong?

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BTW: If you just in general want to compress a video file, msmpeg4v2 is a pretty bad choice. ffmpeg -c:v libx264 -c:a copy -crf 23 -preset slower is much better (change -crf 23 to change the quality; lower = better quality. 18 is often considered visually lossless; you can go much higher). This encode will take a long time, even on fast hardware. Pick a different preset if its too slow. Also, if possible, use mkv or mp4 for the output format. – derobert Apr 8 at 16:21

1 Answer

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Try the following:

ffmpeg -i input.avi -vcodec msmpeg4v2 -acodec copy output.avi
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