What is the best software to split and join avi files without losing quality (lossless) in Windows?


10 Answers 10


On Windows, VirtualDub should be able to do this. Check out this guide for in-depth guide on how to split videos.

The creatively named Easy Video Splitter can apparently do the job easier, but I have never used it so i would not know first hand.


On Windows, you can use VirtualDub. On Linux, there is a very similar program called AviDemux2

  • 1
    And VirtualDub is an opensource product as well. Commented Jul 20, 2009 at 9:23
  • appears that AviDemux works on Windows, as well...
    – rogerdpack
    Commented Nov 30, 2010 at 1:56

Without a doubt, VirtualDub is the way to go.

  • Open the first AVi in VirtualDub
  • Select "Direct Stream Copy" for both video and audio
  • In the file menu, choose Append AVI Segment (or similarly named)
  • File -> Save As and give your avi a new name

Bingo! I have done this many times. The only gotcha is to be aware that the dimensions, codecs, bitrates, etc. all need to be the same or your new video file will behave, lets say, strangely. Or not at all.


What OS?

On linux, you can use mencoder:

mencoder -oac copy -ovc copy -o output.avi input1.avi input2.avi
  • I'm using Windows Vista.
    – software
    Commented Nov 5, 2009 at 15:15
  • Then I would use VLC - videolan.org/vlc Commented Nov 5, 2009 at 15:17
  • I've been searching this command for ages!
    – cweiske
    Commented Jun 28, 2011 at 17:39
  • mplayer/mencoder runs on windows from a long time :)
    – Remus Rigo
    Commented Jan 26, 2013 at 11:17

For Windows: Virtualdub. No contest.


Can do lossless splitting and joining to, which is very fast, by doing no re-enconding (but it can then only split on key-frames, obviously, and both parts joined must use the same encoding).

  • can it do re-encoding for splitting?
    – rogerdpack
    Commented Nov 30, 2010 at 4:36
  • yes, obviously. Commented Dec 11, 2010 at 4:17

Quality after split is problem, because you must reencoded new file. But it depends on what coded used in AVI file.


  • windows only
  • 3
    That is no problem if you use VirtualDub with "Direct stream copy" instead of "Full processing mode" Commented Jul 20, 2009 at 8:41
  • for me, direct stream copy still gives me between i-frames, but "smart rendering" (if another video codec is selected) gives the right sequence.
    – rogerdpack
    Commented Nov 30, 2010 at 4:43

You can easily achieve this with the Quicktime player (you might need pro), but a lot of people don't like simply because the UI looks out of place on windows.




Avidemux is a very powerful and handy video editing software. It supports all common file types locally. Is's most powerful ability is cutting/joining videos without re-encoding.


If you can pay. then "AVS Video Remake" is best choice for Novice Users. This software is awesome if you are concerned about the Output Quality. I have tried many, but I found AVS Video Remake is the Best One.

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