Strange breakup randomly for 1 frame

[tyee]

i'm getting weird breakups for 1 frame when encoding from a vc1 BR source using avisynth. I've never comes across this before until this one movie. If I play the .avs file in mpc-hc it plays perfect, it's just when I encode with x264 this happens. I upgraded to the latest build (r2377) just now and it still happens.

Take a look -

Pic1 (https://www.dropbox.com/s/9a6qyy6d3gw1tqj/3.jpg)

Pic2 (https://www.dropbox.com/s/70f26xfzfx2opip/2.jpg)

Pic3 (https://www.dropbox.com/s/63af08hw6dpvbnk/1.jpg)

[ty2010]

Open the avs in virtualdub and look. Players are all about error concealment. I have a lot of MP4s with invalid time stamps within the GOPs, nothing will code them at all, they play perfectly fine in VLC.

[tyee]

For some reason my avs files are all crashing in vdub after about 3 seconds. That's includes another one that I encoded just fine. Strange. I'm remuxing with eac3to to a new mkv to see if that makes any difference.

[tyee]

Summary
ffvideosource - plays in mpc-hc fine, encodes with the glitches
dss2 - plays in mpc-hc as missing frames. Looks like 15-20fps instead of 23.976fps. Encodes as in playback, missing frames but no glitches.
directshowsource - plays in mpc-hc fine, encodes with glitches.

[Guest]

Post a link to an unprocessed source sample (before encoding). Also post your script.

[ty2010]

You could run it through ffmpeg with -genpts copying the av streams if it's time stamp related.

[tyee]

Ok, here is a sample -- Sample (http://www.mediafire.com/download/7vd73936173cf20/sample.mkv)

After cutting many segments with mkvmerge into 1 minute chunks and selecting the 10th chunk, using all three source filters in the avs file, they all play perfectly in mpc-hc.
Encoding with directshowsource is the worst, lots of glitches
Encoding with dss2 has no glitches, plays perfect
Encoding with ffvideosource has a few glitches

Give it a try. There must be something at the start of the original mkv that makes dss2 miss frames, but now after cutting, it doesn't.
My source of all this was a demuxed mkv from the original BR using eac3to. I don't think the problem is there but who knows?

This is my avs file lines but I'm also using MT which is not shown here -

#FFVideoSource("G:\movie.mkv")
dss2("G:\movie.mkv")
#directshowsource("G:\movie.mkv")

I notice when encoding, ffdshow is decoding the video and LAV splitter is being used. On playback in mpc-hc only LAV is used, splitter and video decoder.

[Guest]

This is my avs file lines but I'm also using MT which is not shown here All bets are off. Try it without MT and report your results.

[tyee]

Without MT, they all work fine. Well that's news to me. If the source is avc instead of vc1, I don't get this problem. Interesting.
So can anyone encode vc1 using MT?

[Guest]

Some AVCs also suffer from this. MT is simply not reliable (though it can be with very simple scripts I am told). It's best not to use it IMHO.

[tyee]

Just a FYI, I managed to get it working without glitches (and with MT) using dss2 and using the Win7TweakerTool to set VC1 decoding to MS instead of ffdshow.