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Libav has the tool avconv, which allows you to do that with the video filter setpts=PTS-STARTPTS. I haven't tried this, but the following should do the trick for you: avconv -i in.vob -vf 'setpts=PTS-STARTPTS' -c:a copy -c:v copy out.vob For more information you can check out http://manpages.ubuntu.com/manpages/precise/man1/avconv.1.html


I know this is a very old Q, but it should be pointed out that a 'negative timecode' makes no sense. The SMPTE frame before 00:00:00:00 is 23:59:59:29. The namespace for drop frame (and non-drop) codes is already well-defined -- no need to postulate negative values. If there are systems or programs that use this notation, they should be rethought.

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