Odd coarse combing?

jmc

Active member
Don't know if it is combing or interlacing.

I have deinterlacing set to on in VRD's "Playback" setting.

The effect only shows up with the main coarse slider bar.
Not the fine tuner slider or when playing the file.

Everything plays well so not a serious problem.
Just is quite jarring to look at when editing.


Thanks,
jmc
 

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Dan203

Senior Developer
Staff member
The way it's on a slant like that is weird. Everything in MPEG is based on macroblocks, which are 16x16 blocks of pixels. I can't see how this could possibly be a decoding issue with such a clean angled line like that.

Could it be your video card? Maybe some updated drivers would help?
 

jmc

Active member
The way it's on a slant like that is weird. Everything in MPEG is based on macroblocks, which are 16x16 blocks of pixels. I can't see how this could possibly be a decoding issue with such a clean angled line like that.

Could it be your video card? Maybe some updated drivers would help?
The files play fine. Only in VRD's coarse main slider bar does that offset show up.

Does have a Lossless option but I imagine I would have a 100G/hour file
instead of a 1G/hour file. Think the file format for that is AVI.

Hmm, maybe i'll try AVI Lossless on 10 minutes of one and let VRD compress it. See what happens.

Thanks,
jmc
 
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Dan203

Senior Developer
Staff member
H.264 works the same way, although the macro-blocks can be a bit smaller they still wouldn't allow for a smooth angular offset like that.

Try one of the other video driver options in VRD. Tey EMR or VMR7 and see if that makes a differnce.
 

jmc

Active member
H.264 works the same way, although the macro-blocks can be a bit smaller they still wouldn't allow for a smooth angular offset like that.

Try one of the other video driver options in VRD. Tey EMR or VMR7 and see if that makes a differnce.
Well, that was interesting. Video drivers no effect.

I did find that it was NOT deinterlacing the files. Argg.

With VRD deinterlace set at OFF there was NORMAL combing.
Only with VRD deinterlace set to ON did the odd image off set occur.

Thanks much!
jmc
 
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Dan203

Senior Developer
Staff member
If it's just a playback issue in VRD I wouldn't worry about it. That deinterlace setting is just setting a flag in the video driver, so it doesn't mean there is something wrong with the video itself. In fact it's more likely that upgrading your video driver in Windows will fix the issue.
 
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