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Old June 11th, 2006, 05:57 AM   #1
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DeInterlacing HDV & Banding

Hi,

I have been trying to deinterlace some footage and it is starting to drive me crazy as everytime I keep getting banding. I am hoping some soul out there will give me some light :)

I have captured some footage with a Z1 in 1080i 50.

I am trying to deinterlace the footage to 1080p 25.

Normally I use MB. So I fired up AE. Imported my HDV footage. Set the field options to NONE in Interpret Footage, just as MB says. Created a composition same size as the footage. Applied the MB DeInterlacer, voila it detects the HDV footage and deinterlaces. However I get these noticable horizontal bands. Now if I go to the Interpret Footage dialog and set the fields to Upper, it looks fine!! Weird !

OK so I thought it might be something to do with MB. So I download DVFilm Maker demo and the same process. DeInterlace my HDV footage to an uncompressed AVI (also done it to a QT). Imported it into AE, set the interpret footage to NONE, created a composition the same size, and bloody hell... the banding is still there!! Once again if I select None in the interpret footage it works!

Now I am thinking it is AE. So I fire up premiere. Import my DVFilm Maker footage, and set the field options to None. And once again I am getting banding. If I set the field options to Always DeInterlace everything is good...

Has anyone ever experienced this before?

I have edited 100's hrs of DV footage and deinterlaced it, and have never come across this. So if someone can tell me what I am doing wrong, or what button I have not pushed it would be greatly appreciated :)

Thanks

Robert
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Old June 11th, 2006, 06:05 AM   #2
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dont premier and aftereffects use the same "common" components?
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Old June 11th, 2006, 07:16 AM   #3
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Old June 12th, 2006, 01:13 PM   #4
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Robert,

Are you previewing at full size, pixel-for-pixel, or is it scaled down? If it's scaled down, it could have something to do with the scaling, and the footage itself may be fine.

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Old June 13th, 2006, 01:21 AM   #5
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Quote:
Originally Posted by Robert Double
Hi,

I have been trying to deinterlace some footage and it is starting to drive me crazy as everytime I keep getting banding. I am hoping some soul out there will give me some light :)

I have captured some footage with a Z1 in 1080i 50.

I am trying to deinterlace the footage to 1080p 25.

Normally I use MB. So I fired up AE. Imported my HDV footage. Set the field options to NONE in Interpret Footage, just as MB says. Created a composition same size as the footage. Applied the MB DeInterlacer, voila it detects the HDV footage and deinterlaces. However I get these noticable horizontal bands. Now if I go to the Interpret Footage dialog and set the fields to Upper, it looks fine!! Weird !

OK so I thought it might be something to do with MB. So I download DVFilm Maker demo and the same process. DeInterlace my HDV footage to an uncompressed AVI (also done it to a QT). Imported it into AE, set the interpret footage to NONE, created a composition the same size, and bloody hell... the banding is still there!! Once again if I select None in the interpret footage it works!

Now I am thinking it is AE. So I fire up premiere. Import my DVFilm Maker footage, and set the field options to None. And once again I am getting banding. If I set the field options to Always DeInterlace everything is good...

Has anyone ever experienced this before?

I have edited 100's hrs of DV footage and deinterlaced it, and have never come across this. So if someone can tell me what I am doing wrong, or what button I have not pushed it would be greatly appreciated :)

Thanks

Robert
I received this question by email and here are my responses

That's probably not banding as we typically define it here but residual interlacing a result of the soft logic in the motion detector. The solution is to raise the sensitivity of the motion detector in Maker (see advanced options). Although before you do it you might consider whether the effect is apparent in real-time playback. Also see

http://dvfilm.com/maker/motion.htm


You have to set the interpret footage to None or you will lose 1/2 your vertical resolution. If you have a static shot with fine diagonal lines you'll see what I mean. Remember that the audience does not scrutinize individual frames, you must consider the whole shot played back in real time, where perceived sharpness and quality is primarily in static areas of the screen, not the areas that are in motion.

Also I would add: residual interlacing, if it's faint enough, is not visible to the viewer, because it occurs in low-contrast areas under motion. The soft logic allows the deinterlacer to make smooth transitions between moving and non-moving objects; it's the price you pay for the improved sharpness and overall better performance of motion sensitive deinterlacing.

By the way, regarding the above post on Vegas, it's built-in deinterlacer loses 1/2 vertical resolution, always. That's not good.
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