VirtualDub MP3 Freeze direct stream copy of audio broken?

[nbi]

I followed the VideoHelp guide for cutting avis using VirtualDub MP3 Freeze, but the procedure produced an avi with truncated audio. To confirm this problem I just loaded and saved an avi and sure enough the audio is truncated. I had to use MP3 Freeze because of the VBR issue. Is there a version of MP3 Freeze that has this bug fixed or is there another workaround? Thanks in advance.

[Baldrick]

try virtualdubmod instead. just select no if it wants to rewrite the header.

[nbi]

try virtualdubmod instead. just select no if it wants to rewrite the header.

It is broken too. I have an avi of 14248 frames. I want to trim only the first 8. This does not work. Any attempt to perform a range operation (delete, save to file, etc.) when the start marker is less than 64 but not at the beginning fails. So trying to save frames 9-14247 results in a copy of the original (the start marker is ignored). The lowest frame number for which the biggest possible save works is 64, i.e. saving frames 64-14247 works. Of course this doesn't help in any way since the overlap I'm trying to correct is less than 64 frames. I did find out the significance of frame 64, this is the first keyframe. As I'm not a video guru knowing this doesn't help me. Not sure if it would help anyone solve this problem.

I'm almost out of ideas. None of the cutting/trimming suggestions work. If there is a way to play an avi in reverse I might be able to use the mplayer/mencoder -frames option to trim the beginning.
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I found the Nicky's appendix on keyframes which explains the subject nicely. That is indeed the problem I'm running into. VirtualDub & VirtualDubMod won't allow a cut that's not at a keyframe. So I need to find a way to insert a keyframe where I want to cut.
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Success! The trick is to reencode the frame range covering the cut point using mencoder with "-lavcopts keyint=0". This forces every frame to be a keyframe (Iframe). When every frame is a keyframe a cut can be made at any frame with VirtualDubMod.