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AVISource relies on the VfW interface to do its parsing (and does so by using VirtualDub's parser, IIRC). If you can open it in VDub but not AviSynth+, then it's an AVISource issue that would need to be resolved by updating AVISource. While FFmpeg might have that limit, it would likely depend on the parser. The DirectShow AVI parser obviously wouldn't have a limit like that if DirectShowSource works. If VDub doesn't like it either, it's probably in VfW and there's little that can be done about it short of finding a third party AVI demuxer for VfW (but honestly, that's probably more trouble than it's worth).
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