Avisynth + VC-1 source & W7 = problem?

[follz20]

Hi all

I'll try to be concise as possible with this post but there are a few variables so bear with me. Here are my specs & installed programs:

quad cpu @ 3.78ghz
2gb RAM
ATI 5850
Windows 7 pro
ffdshow rev 3342
mpc-hc rev 1774
Standalone filters registered: Matroska muxer; Matroska source; Matroska splitter; MPC - Mpeg source (gabest); MPC - Mpeg splitter (gabest); MPC - Mpeg-2 video decoder (gabest); MPC - Video decoder
Sources: blu-ray VC-1 m2ts files

I am having a problem trying to encode VC-1 video sources with avisynth & MeGUI inside Windows 7. Basically, regardless of encoding settings, the result is always slow, choppy video (as if frames are missing- sample below). I say that the problem is related to W7 because in XP I never had any such problems with the same settings/sources.

I can load the vc-1 source in avisynth script creator in MeGUI perfectly fine. I save it, then I see what the result is when I play the .avs file with mpc-hc. The choppy playback resumes, regardless of the decoder used: have tried it with libavcodec or wmv9 with ffdshow; or with mpc-hc's internal transform filters. So, having played around and tested this, I can safely say this is a encoding problem with the vc-1 source and avisynth in W7.

Doing a bit of net searching, some people believe that there is indeed a problem with vc-1 & avisynth in W7 but there appears to be no apparent solution (as far as I can see).

So, attempting to sum up the problem: can't properly encode vc-1 sources without slow/choppy playback (via avisynth & megui); no errors whatsoever when making avisynth script or during encoding; all other video encodes (avc, x264 etc) turn out fine.

Here is a sample of an vc-1 encode, it's only 18mb:

http://rapidshare.com/files/37527805...e_-_intro_.mkv

It might just be better to take a look to see what I mean. This is basically what all my vc-1 encodes turn out like.

Any help appreciated!

PS- My simple avisynth script for *most* encodes (depends on aspect ratio):

DirectShowSource("E:\Blu-Ray Rips\tbe.m2ts", fps=23.976, audio=false, convertfps=true)
#deinterlace
#crop
#resize
#denoise

My x264 encoding settings:

program --profile high --pass 2 --bitrate 10000 --stats ".stats" --thread-input --keyint 240 --min-keyint 24 --bframes 5 --ref 6 --me umh --direct auto --partitions all --output "output" "input"

[Lyle_JP]

I get the exact same problems with VC-1 and the Gabest splitter. Use the K-Lite Codec Tweak Tool -> Manage Preferred DirectShow Filters to set Haali as the default splitter for .m2ts files (32 and 64 bit) and that problem should go away.

Of course, the problem shouldn't be there in the first place, but I'm at a loss to explain why Gabest works with VC-1 on some machines but not others.