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Using VirtualDub and AviSynth to make a split/PiP movie

The last few days I've been trying to find a good freeware software that will let me compress and combine 3 video clips produced by FRAPS into one by dividing the screen into 3 parts.

I did find one freeware video editing software called VSDC Free Video Editor but I didn't manage to get a descent output quality using it and I also had problem arranging the clips the way I wanted them. Using VirtualDub on the other hand and a video codec called x264vfw - H.264/MPEG-4 AVC codec produced very good quality but then I have the problem how to combine the 3 movie clips into one.

After some searching on Internet I found out that you can use VirtualDub together with AviSynth scripts to produce this kind of effect, (Split screen/PiP).

Next step will be trying to learn a little bit more about this but since I'm all new to this I though I should ask you pros in here for any tips on how to accomplish this.

In short my situation is as follows:

I have 3 movie clips made by FRAPS. What I would like to do is to compress them using VirtualDub with the codec mentioned above and to have the 3 movie clips combined into the same screen so the output will show all 3 movie clips playing simultaneously - one at the upper half of the screen from side to side and the other two side-by-side at the bottom half of the screen. Also I would like the clips to be automatically re-scaled to fit and last I only want the output to include the audio from one of the clips at the lower half of the screen.

I made a very simple drawing trying to illustrate this

Attachment 18436

Thanks in advance for any tips on how to accomplish this using VirtualDub together with AviSynth scrips.
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