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I have two high-quality mp4 files, which are of two parts of the same show.

I want to merge them together into 1 file, and I usually use VirtualDub to merge my files... But it doesn't seem to support mp4.

What alternatives are available (especially ones that don't require re-encoding)?

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Im having great trouble merging MP4 files without ending up with out of sync audio. – djangofan Nov 27 '09 at 23:44
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6 Answers

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I usually use VirtualDub to merge my files, but it doesn't seem to support mp4. So what alternatives are there?

Avidemux. It's just like VirtualDub, only with more formats supported and built-in codecs and filters. I always use it in preference; it joins AVC+AAC.MP4 files (without recoding) fine for me.

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yeah, it seems to do excellent with keeping audio in sync with video whereas the other persons answers to this question are questionable on that IMHO. – djangofan Nov 12 '10 at 23:39
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up vote 3 down vote

Try using the Makostra video container.

Firstly, you need mkvtoolnix. Download and install it, then you need to fire up mkvmerge GUI (unless you like command-line tools, which is fine by me - although you might want to look at the file linking section of the mkvmerge documentation).

Add your first file by clicking "add". Then, click on "append", and open your second file. Set the output file, hit "Start muxing" at the bottom, and away you go!

If the container is unsuitable for your needs, you can reencode it, or try to convert it to some other format... Although MKV is a very lovely container!

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it has to be muxed? i cant be joined without muxing? – djangofan Nov 27 '09 at 23:45
Well, if you're using an MKV container, technically you are remuxing it. Try it, there is no real time penalty... – Breakthrough Dec 7 '09 at 2:09
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up vote 3 down vote

YAMB along with MP4BOX is a good option.
Download both and unzip them (no installation needed and together they're about 5MB), in YAMB choose Settings and set the folder path of MP4box.
To join mp4 files choose Editing > Click to Join supported...

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Seems like the best solution, keeping the .mp4 container format which would seem the more attractive option to the author ^^ – Oskar Duveborn Sep 19 '09 at 13:44
After difficulty, I used this config: MP4Box_path=E:\Software\Video Editing\Yamb-2.1.0.0_beta2\MP4Box\MP4Box.exe in an attempt to merge 4 500MB MP4 files generated from AVIDemux . It didn't work. The program just sat there for 45 minutes doing nothing until I finally gave up. – djangofan Nov 27 '09 at 23:43
i had trouble using this method because of audio sync problems. it was a nightmare... not trying it again. – djangofan Nov 12 '10 at 23:37
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up vote 2 down vote

SUPER © (Simplified Universal Player Encoder & Renderer) provides the following additional Output Process:

Any supported input Multimedia file can be processed:

      o Join Format-Identical Files.
      o Mux Video & Audio Streams.
      o DeMux Extract Streams.

of course, MP4 is a supported format.

SUPER © is freeware.

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Its user interface is the most horrible I've seen in my life. I'm not kidding, it's just horrible. I emphasize it once more: I can't name a worse interface, I'm serious about it, I've never seen anything below the "SUPER threshold". – Camilo Martin Jan 12 at 14:48
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up vote 1 down vote

Another solution is Open Video Joiner. It also does transition effects.

enter image description here

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It's a shareware though. and for 30$ it's not cheap just to merge video files – Xenorose Sep 19 '09 at 12:10
It was said to be freeware. Sorry if I was misled. – harrymc Sep 19 '09 at 15:51
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up vote 0 down vote

If you can play them on your system / have a codec installed, Windows Movie Maker may the quickest (and free) way to join the two files. You can then use Virtualdub to convert to a different format.

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Audacity seems to be for audio files. This is a video file. – Paolo Bergantino Sep 18 '09 at 22:40
So sorry, I mis-read, just saw the MP part and my brain though audacity. – William Hilsum Sep 18 '09 at 23:01
Editing answer... – William Hilsum Sep 18 '09 at 23:02
AFAIK, Movie Maker doesn't support mp4 and converting to a different format means lose of quality which the question specifies as unwanted. – Xenorose Sep 18 '09 at 23:16
I tried MovieMaker on windows7 and the audio becomes out of sync when joining MP4 files into a WMV. This option wont work. – djangofan Nov 27 '09 at 23:10
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