How to split flv file by size using FFmpeg or menc

问题:

I need to split an flv file into chunks of the known size on linux server. For example my original file is 9Mb and the chunk size is 4Mb. So I should get 3 parts - 4Mb, 4Mb and 1 Mb.

Seems that FFmpeg can split only by time.

Mencoder can start by time (-ss TIME) and finish by size ( -endpos SIZE MB). But if start second of the first chunk is obviously 0, then how can I get start second for next chunks?

Do you have any suggestions?

Thanks in advance.

回答1:

calculate ~time (sec) of every block & use -ss X -t X+avg_block_time for split video

回答2:

There is a commandline utility which does just that: http://mpgtx.sourceforge.net/

mpgtx -3 movie.mpg -b mysplit

will split the movie into 3 chunks with the names mysplit-1.mpg, mysplit-2.mpg, mysplit-3.mpg

That said, I seem to have trouble with the audio when I use this - but I don't know if you'd have that problem too.