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. – Chathuranga Chandrasekara Jul 20 '09 at 9:23
  • appears that AviDemux works on Windows, as well... – rogerdpack Nov 30 '10 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 Nov 5 '09 at 15:15
  • Then I would use VLC - videolan.org/vlc – DaveParillo Nov 5 '09 at 15:17
  • I've been searching this command for ages! – cweiske Jun 28 '11 at 17:39
  • mplayer/mencoder runs on windows from a long time :) – Remus Rigo Jan 26 '13 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 Nov 30 '10 at 4:36
  • yes, obviously. – Lennart Regebro Dec 11 '10 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" – Daniel Rikowski Jul 20 '09 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 Nov 30 '10 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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