Utility or method for joining MP4 files

Question

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.

Answer 1

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

./MP4Box -add file1.mp4 -cat file2.mp4 -cat file3.mp4 output.mp4

Answer 2

I was encountering audio sync issues when trying to do this with Avidemux, but I came upon a two-step process that keeps the audio in sync:

1. Concatenate files using MKVToolNix (I used version 7.4.0 for Mac). This results in a Matroska video (.mkv) file.
2. Remux the .mkv file to MP4 format using Avidemux (I used verison 2.6 for Mac). I chose the MP4v2muxer option in the Output Format section. This results in an MP4 file with audio and video in sync.

Answer 3

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.

Answer 4

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.

Answer 5

i think MPEG Streamclip can do this. It's free on mac and pc.