Video Diagnosis - Interlacing Suspected...

[hizzy7]

Hi Video Masters!

I have a funny looking video with ghosting or blurring. I don't think it's a PAL/NTSC issue, but I can't tell. What are some signs of a bad PAL/NTSC conversion? Are there any tell-tale signs I should be on the lookout for? Here is a link to the clip:

http://files.videohelp.com/u/183506/MAG%203.demuxed.m2v

I suspect interlacing. Is that right? Would one of the better de-interlacers in Virtualdub fix this?

Thank you for your help. It is always appreciated!

[poisondeathray]

It's field blended like many of your other examples . The treatment is the same with some bobber and srestore

Are there any tell-tale signs I should be on the lookout for?

You look for the blends


Use AssumeTFF().SeparateFields() and go field by field in vdub or avspmod

[hizzy7]

Hi!

Is field blending a kind of interlacing or is it a different beast? How does a video get blended fields?

Thanks for the help!

[manono]

Is field blending a kind of interlacing...

No, as fields aren't interlaced. It's when the fields are combined back into full frames that you get the interlacing.

How does a video get blended fields?

It's usually (but not always) the result of a standards conversion - PAL<->NTSC. Blended fields are added to go from 23.976/24->25fps or 25->29.97fps. As pdr mentioned, you separate the fields or bob it and look for the blends/ghosts/double-images.

Your sample was from a PAL source but converted to NTSC. The 'base' framerate is still PAL 25fps.