On Sat, 2008-04-26 at 19:56 +0100, Mick wrote: > On Saturday 26 April 2008, Hal Martin wrote: > > I assume you want each piece of this file to be play-able? If you don't > > care about that, just use split to chop them up into your desired size > > and then use cat to reassemble them at the destination. > > > > *$ split –bytes=1m /path/to/large/file /path/to/output/file/prefix* > > > > 'man split' will also contain this information. > > Thanks! I didn't know about split. > > I am afraid that the split files have to be playable. I intend to upload > them > on a server for a MSWindows user to download and play. It has to be point & > click skill level at the receiving end.
Hmm, theoretically it should be possible without re-encoding because video files contain I-frames which are encoded without reference to previous frames every x frames. With a media player you can only seek through a video from I-frame to I-frame (I think ...). If that assumption is right, it should be a relatively easy task. Something like this might work: mencoder -vf harddup -ovc copy -oac copy -of lavf -lavfopts format=mov -ss 1:30 -endpos 3:00 -o output.mov input.mov explanation: -vf harddup -> don't skip duplicate frames -ovc copy; -oac copy -> don't re-encode audio and video -of lavf -> use lavf for muxing -lavfopts format=mov -> mux into mov-format -ss 1:30 -> skip the first 1 min + 30 sec -endpos 3:00 -> end input at position 3:00 min of the original film -o output.mov -> write to output.mov This command should result in a file containing a total of 3:00-1:30=1:30 min of film, however, seeking might be inaccurate (searches next or previous I-frame) so both videos might overlap for maybe a second or two or you could loose that amount time therefor tweaking might be necessary. Unfortunately, I couldn't test this because I have no suitable video file at hand. If it works, tell me please, if not, post your results, maybe I can look further into it.
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