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Accepted
Jason Watkins
Asked: 2010-11-16 20:11:11 +0800 CST

Split ogg-theora video files without re-encoding?

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Good evening all,

I have decided to rip my entire DVD collection to Ogg-Theora video, specifically a few different TV series' that I have so I don't have to keep digging the discs out. To do this, I have been using dvd::rip to pull the individual vob files from the disc and then using ffmpeg2theora to encode. This process has been working great for me until I hit a slight snag. The dvd I just ripped does not have the individual episodes in vobs, but the entire disc of 7 episodes in one vob. I went ahead and ripped it and encoded the whole thing into Theora. Now, how do I split this file into the individual episodes?

I would prefer not to re-encode these, and obviously any prospective program would need a easy way for me to set the 'cut' points. I have used a few similar programs in Windows (for other formats), but I am unsure of what is out there for Ubuntu. Does anyone have any suggestions? Thanks!

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3 Answers

  1. Best Answer

    Thanks for the answers I have received so far! I think I have found a utility that works for my needs. After some research, it seems that Xiph.org (the makers of theora) have a utility that has a chop functionality that takes a time offset (much like the ffmpeg utility that aking1012 mentioned ) called oggz-tools

    sudo apt-get install oggz-tools

    It does a direct stream cut as well, meaning the quality stays the same and the process only takes a about 10-15 seconds. I have more playing around to do with it, but it seems like a winner after using it for a few videos.

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  2. You could try Avidemux available in the repositories, you can install it from the software center, mark the segment you want, select your container type and use the copy options to get the marked segment out without re-encoding, More information about Avidemux here: http://fixounet.free.fr/avidemux/

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  3. this can be easily accomplished with kdenlive if you like gui's or with ffmpeg using
    ffmpeg -vcodec copy -ss 00:01:00 -t 00:03:00 -i infile.ogv outfile.ogv
    if you want to time slice it...guaranteed no re-encoding of the video with the ffmpeg approach

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