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I have a divx video of 10 mins. I want to copy two parts from it , minutes 2 to 6 and 8 to 10 and create another video by merging the two. how can I do it using lightweight command line tools. Either on Windows or Linux?

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2 Answers 2

up vote 3 down vote accepted

Perhaps ffmpeg/mencoder (available on either platform).

To split:

ffmpeg -ss [start_seconds] -i [input_file] -t [duration_seconds] [outputfile]

For example:

ffmpeg -ss 2 -i input.avi -c copy -t 4 video1.avi
ffmpeg -ss 8 -i input.avi -c copy -t 2 video2.avi

To merge:

mencoder -ovc copy -oac copy video1.avi video2.avi -o output.avi

If your video/audio is out of synchronization, you might need to re-encode them, e.g. with XviD for an AVI container, and MP3 audio:

ffmpeg -ss 2 -i input.avi -c:v libxvid -qscale:v 3 -c:a libmp3lame -q:a 3 -t 2 output.avi

Change the qscale parameter to a lower value for higher quality, and the same for q:a for the audio parts.

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does it work on divx encoded videos? let me check.. –  iceman Nov 26 '09 at 20:20
    
small corrections ; -t duration' : Restrict the transcoded/captured video sequence to the duration specified in seconds. hh:mm:ss[.xxx] syntax is also supported. -ss position' : Seek to given time position in seconds. hh:mm:ss[.xxx] syntax is also supported. Itried this and it worked but the video and the audio are time shifted and also there's a big difference in the original and output quality.The output's very degraded. DivX is a variant of MPEG4 hence we can ffmpeg as it can produce MPEG4 on its own –  iceman Nov 26 '09 at 21:03
    
I left out the hh:mm:ss given the context of your answer. I admit, I tried this in a ssh connection to home. Didn't verify the quality. Perhaps try doing it all w/ mencoder? –  basszero Nov 28 '09 at 14:35
    
the video and the audio are time shifted –  iceman Dec 27 '09 at 9:01
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To split the video there's a hand command line tool called jumptheshark.

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