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I have two MP4 files that I generated with Camtasia Studio. I need to join them together post rendering with Camtasia (it can't be done during the Camtasia rendering process). Looking for a utility or technique that will work to join these, preferably that doesn't require re-rendering all the video again.

Update: Either Windows (preferred) or Mac. Doesn't need a GUI if it is a good command-line app.

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It would help to know what platform/OS you are using. –  filzilla Apr 2 '12 at 23:21
    
@filzilla: Either Windows (preferred) or Mac. –  Jim McKeeth Apr 3 '12 at 17:44
    
See superuser.com/q/51047/31983 –  200_success Apr 12 '12 at 10:50
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3 Answers

I think the simplest way to this is to use MP4Box.

./MP4Box -add file1.mp4 -cat file2.mp4 -cat file3.mp4 output.mp4
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Avidemux should do the work.

  1. Load File
  2. Go to File -> Append and select File
  3. To the left of the video window,
    • set video mode to Copy;
    • same for audio mode;
    • set format to MP4.
  4. Go to File -> Save -> Video.
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This does what I am looking for, but it is causing the audio to go out of sync at the join point. I am going to try and join and mix the audio from a separate channel. –  Jim McKeeth Apr 3 '12 at 17:43
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I would suggest using ffmpeg, and the -vcopy switch. Usually this will work, but it depends on codec support.

Various builds of it have various codecs. If one version of it doesn't work, try downloading a copy from a different site.

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