Could this be caused by disabling Scene Change Detect?
 

I"ve never noticed this before, but everyonce in a awhile as I go through the key frames in virtual dub I get one that looks like this.

Could this be a problem with the MA script and turning off scene change detect in CQMatic?

Any ideas?

http://www.digitalfaq.com/archives/error.gif

Hi audi2honda,

Have you loaded your .avs in Vdub, and jumped to that same scene for comparison :?:
Just to check and compare the source to your encoded frame :?:

-kwag

Hi kwag, unfortunetly I deleted the avs file for that encode, but I have another example below. I'm encoding several of these disks and this is another one with similiar problems.

The first screenshot is the final encode, the second is a screenshot of the .avs file loaded into Virtual Dub. You can see the source is clean.

One other thing is that this sequence (opening credits of the dvd) is 29fps NTSC, but I used telecide and decimate to convert it to 23fps.

I've encoded this sequence from other DVDs many times in the past and never noticed these blocks. I'm sure it's new because I double check all of my encodes and this jumped out at me right away.

Any thoughts?

http://www.digitalfaq.com/archives/error.gif

http://www.digitalfaq.com/archives/error.gif

Is the scene before that, a scene change :?:
Maybe you should try to encode a test strip without any filters at all :!:
Just to try and pinpoint where the problem is :idea:

Edit: It looks to me like the encoder just didn't allocate enough bitrate for that scene (frame) :!:

-kwag

hi audi2honda..

Ain't that "Sex in the City" ?? :oops:

If so, I thought that show was pure Interlace, and not Film ??

If it turns out that it IS PURE Interlace, then that could be your problem.

But, weather it does or does not, it could or sounds to me like a scene
change issue, where your IVTC did not handle this scene change very well.
Also, the filtering could have something to do with this scene change too.
It would have helped to cause this issue/glitch.

As Kwag said, try w/out filters.

Now, should it turn out to be Interlace only, then you have a choice..
To de-Interlace or NOT.. that is the question :)

Assuming it's Interlace...
I don't know what your goal is ie:
* to fit as many episodes on one CDR (or DVDR)
* to fit 2 40min episodes on one CDR w/ good quality
* etc. etc.

But, if you de-Interlace properly, you can fit whatever your goal was, per
CDR/DVDR and maybe more. Otherwise, leave as Interlace and expect a
bit more bitrate to waist.

-vhelp

It is sex and the city. It is 70% film and 30% interlaced video, but as I mentioned above I use telecide and decimate to covert it down to 23fps.

I"ll try without any filters and yes this is the first frame after a scene change.

I audi2honda,

Sorry I haven't a copy of SIC, but I'm confused w/ your last response 8O !!

Ok, if this is an Interlaced source, then it SHOULD BE ALL Interlace.
But, you said (assuming dvd2avi) reported 70% film, 30% other.

Have you tried just doing a straight w/out Force Film checked ??
...and then feed inside vdub and view frame by frame to that point/scene
that causes you issues.

You don't have to do a complete dvd2avi, but just enough for the testing.

Also, providing you do enough, scan throughout source, for consistancy of
Interlace frames. You could be IVTC'ing a source that is not really 24fps,
but that you are getting "close" results. I think this is considered "hybrid"
material.

Well, it's just a thought for you to try out anyways :)
-vhelp