AVS 2.5 failed open mpeg4 avi file

[vishaw]

I have some video clips from my Casio-Z750 digital camera. It is mp4 avi, 29,97 fps. Windows Mp 10 plays it smoothly; VirtualDub/Mod and Premiere 6 can not open it.
I thought this would be a perfect case for Avisynth, but I simply could’t make it work. Installed AviSynth 2.5, AvsEdit 1.1.0, ffdshow mp4, ffvfw mp4 codec, checked the avi with Gspot v252, Gspot indicated:“FourCC: M4S2, fully Compliant MPEG-4 v2 simple profile codec; ffdshow.ax is used by windows as decoder. Mp4sdmod.dll is suggested as Gspot rendering but it did not work.
When served by AviSynth, it constantly complained:”could't locate a decompreessor for fourcc M4S2”. Tried AviSource, AviFileSource, DirectShowSource, all failed, with either WinMP10 or MP-classic 6.4.8.7
InterWinDVD creator 2 can open these mp4 avi files, but it is not as good as Premiere for editing. I can export another huge-sized DV-coded avi from this program, which Premiere can open, but this is just where AviSynth can do a good job.
What can I do if I really want enjoy this wonderful feature of AviSynth?:confused:

Any advice is highly appreciated.

[foxyshadis]

One way I usually get directshowsource to work is to open it in graphedit and save the graph, then open that graph in DSS. Avisource of course wouln't work, it's the same mechanism vdub uses and requires a vfw codec.

FFDshow appears to support M4S2, you could enable it in its VFW decoder config and be able to open it in vdub/avisynth that way.

[vishaw]

Thank you very much for your extreamly quick response and useful suggestion.
After I tweak some of ffdshow's vfw settings to allow it working for mp42 and mpg avi, which are disabled by default, I can open these clips in WinMP10, VdubMod, MP-classic through DirectShowSource, I am very happy now.
Thanks again for your help.:)