AVISynth Dropping Frames

[Lycaon]

CLIP: MacedoniaClipType2.avi (http://www.pocketmovie.org/Video/MacedoniaClipType2.avi)

I'm trying to frame serve this clip with AVISynth 2.55 and it drops the duplicate frames automatically and screws up the audio sync. Is this a bug or do I need to specify a setting? I tried 2.56 Beta2 with the updated dll and it does the same thing.

DirectShowSource("D:\MacedoniaClipType2.avi", 30)
The decoding is all through DirectShow. The VFW DSVD Codec is not installed. When I preview the AVI file in WMP or VirtualDub 1.6.4 it plays back all the frames.

UPDATE: I Saved the clip as Uncompressed RGB and AVISynth did Not drop any of the frames. So it seems to be a problem with the way AVISynth handles DV-Type2 through DirectShow. I'll try some other codecs and VFW.

Thanks.

[Lycaon]

After a few rounds of testing I've figured out that this is a bug between Windows DirectShow DV Decoder and AVISynth. Perhaps I should post this in the AVISynth Usage Forum.

All the other decoders, Mainconcept, VFW, FFDshow, and Canopus worked perfectly with the clip. BTW, MainConcepts new Pro Codec fixes the sharpening issue. It works beautifully. I'll try to post of a few comparisons shots.

[Velocity 7]

I'm also wondering about this sort of problem. If you check out my thread (http://forum.doom9.org/showthread.php?s=&threadid=92017) it's about the same video/audio sync problem.

However, if what you say is true, that AVISynth is dropping "duplicate" frames, I would wonder why VirtualDub would do the same thing (when opened directly).