Is there a (at best free) solution to merge AVI-Files in Mac OS X Lion without the need to recode them? (Until Snow Leopard I used D-Vision 3, which won't run on Lion because it's PPC.)

  • By "merge", do you mean combine in sequence? Aug 3, 2011 at 20:19
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    Also, we need to know the video format (motion JPEG? H.264?) to know whether this is possible. Aug 3, 2011 at 20:19
  • @Mechanical: Yes, by merge I mean join them seamlessly in sequence. We can take as granted, that all files share the same framerate, codec and resolution. Used codec is mainly following the MPEG-4 standard such as Xvid. In fact it is possible as it was before Lion as well as it is with Windows. I'm looking for a tool that also runs on Lion.
    – Chris
    Aug 3, 2011 at 22:43
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    In general, ffmpeg the tool for this. Aug 3, 2011 at 22:49
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    I started the bounty only because @w00t's answer is godsend — it probably saved me few $/€'s worth of actual money; and it would had saved a lot of time & effort if I just had stumbled on it earlier… Aug 31, 2011 at 12:45

7 Answers 7


To make your copy of avidemux2.app work, simply open the application bundle (show package contents in finder) and remove the files libxml.2.dylib and libiconv.2.dylib from the Contents/Resources/lib folder.

This will make avidemux2 use the versions that ship with Lion and which seem to work just fine.

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    Thanks, good information. Did not know I could delete them instead of replacing them.
    – Chris
    Aug 13, 2011 at 22:49

This works for me:

cat part1.avi part2.avi part3.avi > tmp.avi && mencoder -forceidx -oac copy -ovc copy tmp.avi -o output.avi && rm -f tmp.avi

Then output.avi should not only have the whole content but also have the indexes recalculated so the whole movie plays.

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    Genius. And worked for me as well.
    – peelman
    Dec 6, 2012 at 3:51
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    NB: The command line is quite long so be careful when copying it. Mar 9, 2013 at 10:59
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    Worked like a charm! Excellent answer. Mar 9, 2013 at 11:15
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    -bash: mencoder: command not found. Download ffmpegXbinaries20060307.zip unzip and then copy mencoder to /usr/local/bin and then above works wonderful. THANKS! Jun 29, 2013 at 17:03
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    @westondeboer If you've got macports installed, sudo port install mplayer Sep 5, 2013 at 1:29

Avidemux is an open source tool for editing/combining videos, and there is a Mac port:


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    Thanks. Avidemux does not support Lion at the moment. Avidemux uses a lion-incompatible version of the library libiconv.2.dylib. I got it working by replacing the library with a patched version from GnuCash: bugzilla.gnome.org/attachment.cgi?id=192432
    – Chris
    Aug 5, 2011 at 10:44

Try this Lion-compatible Version of D-Vision 3: D-Vision 3 (Intel)

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    Where did you get this version from? I'm not that comfortable with downloading programs from unknown sources.
    – Chris
    Aug 12, 2011 at 17:49
  • Actually the author's site has a universal binary: objectifmac.com/dvision.php
    – w00t
    Aug 13, 2011 at 15:01
  • @w00t: You're right. In fact the D-Vision main app works on Lion, while joining AVIs with D-Vision does not. You can start it, select the tool to join AVIs, select your AVI-files and start the task. I checked "delete source files when task is finished" (as always) and then I got the Rosetta-error and also lost my source-files.
    – Chris
    Aug 13, 2011 at 22:48
  • @Chris: actually I just copied the universal-binary-files from the newest D-Vision 4 beta into the old D-Vision 3 App-Bundle.
    – fheusel
    Aug 18, 2011 at 7:31

D-Vision will work with OS X Lion. Just use mencoder and not the default avimerge.

  1. Download newest version of ffmpegX.
  2. Right click “Show Package Contents”
  3. Copy avimerge located in Contents > Resources > avimerge.
  4. Paste the avimerge file in the same location within D-Vision.app file. To do this, right click “Show Package Contents” at the "D-vision.app" icon and paste it in "Contents > Resources".

D-Vision will then work a treat in Lion OS X.


Here is a way that requires absolutely no additional software. If you have OS X, you can do this. Open Terminal and do this:

cat /path/to/part1.avi /path/to/part2.avi > /path/to/where/you/want/whole.avi
  • Unfortunately, it doesn't work for me.
    – rich
    Dec 2, 2012 at 14:19
  • What do you mean by "it doesn't work"? You'll have to be more specific if you want some help.
    – bernk
    Dec 4, 2012 at 9:36
  • This is great accept it doesn't work for me either.... I end up with only the first video in the output file (Mountain Lion) Feb 1, 2013 at 21:14
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    This would probably only work for files that don't require any kind of header. To my knowledge, .avi files have a header so basically, this would only append the 2nd .avi file to the end of the first but the header information won't be there for it to be played. Mar 9, 2013 at 10:16
  • The output file has the size of the combined input files, but only the first video file plays. The avi player ignores the rest of the data.
    – SMBiggs
    Jan 26, 2022 at 6:55

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