I don't know if this is already possible using a third party plugin or if this is already built into the next version of AviSynth, but just in case, here is my feature request.
I request that SegmentedAviSource and SegmentedDirectShowSource give you a choice between AlignedSplice and UnalignedSplice. The AviSynth MediaWiki states that segmenting uses UnalignedSplice.
There is a very good reason for this feature request. Behold. When using Fraps to record my games, it will split the footage into 4+ GB chunks. Sometimes the audio and the video streams will have 2 different lengths and upon concatenation, this will cause the video to have noticeable desynchronization near the end.
Of course, I can manually and tediously combine these clips using AlignedSplice but that's a pain in the butt!
Thanks,
-Neil
P.S. Sorry, I have no idea which category this Feature Request belongs in.