Ah, found this wiki entry
http://avisynth.org/mediawiki/FAQ_lo...to_AviSynth.3F which says
Quote:
If your media file contains MPEG-4 ASP video, then there are two possibilities of opening them in AviSynth ...
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and
Quote:
If your media file contains MPEG-4 AVC video, then there are two possibilities of opening them in AviSynth:
1) Using the plugin FFmpegSource. See above for its usage. At the moment, the supported containers are: AVI, MKV and MP4.
2) Get DGAVCDec. At the moment you need to extract the raw stream (*.264) from the container first (using MKVExtract, MPlayer, TSRemux or whatever program can extract those streams). Open the raw stream file in DGAVCIndex to create an index file (say track1.dga). Open the index file in AviSynth
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As I'm not sure in the general case how to tell what the .mp4 contains (ASP or AVC), DGAVCDec with [which demuxer?] would do the trick ?