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VirtualDubMod (simple?) question about speeding up a portion of a video

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I have a high speed video camera (Edgertronic).I produced a nice video clip: http://www.youtube.com/watch?v=OL8xwX0QUCA
Now I want to speed up part of the video, and keep the rest at the current speed.
So I've installed VirtualDubMod and separated the two pieces...


a=avisource("untitled.avi").trim(1,124)# comment
#assumefps(100)
b=avisource("untitled.avi").trim(125,1196)# comment
video=a+b
video


The above works fine, but of course it doesn't DO anything, other than separate the two pieces and then play them back as one..
What code would I have to add (keep it simple, please) to speed up the first part.
Say, by a factor of 6.
I know there is assumefps, changefps, but I can't seem to get the syntax right.
I am not fussy about getting this perfect the first time.
I could select every 6th frame, or blend frames, whatever.


Would appreciate it if someone could suggest exact changes to the above, so I have a starting point for experimentation.


Thanks a lot.


Alan Wolf

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