Ask Matt Silverman: Deinterlace / Removing Pulldown

Matt Silverman was recently asked a question regarding unsatisfactory results with deinterlacing in After Effects. The customer's footage had the following workflow
- Shot at 35mm
- Telecine color correct transfered to NTSC Digibeta
- Digitized to Avid Nitris DX at 1:1 MXF
- Exported to 29.97 NTSC TIFF sequence
- Imported into After Effects
- Deinterlaced with interpret fields or with BCC Deinterlace
The customer complained about soft results with loss of detail, most apparent in hair, teeth and clothing textures. What would Matt Silverman do?
Matt: Sounds like he does not want to de-interlace, but rather remove pulldown (assuming film was shot 24fps). So, he should bring the footage into AE, go to interpret footage, and click "guess pulldown". This should find the correct pulldown cadence for the first shot and make the clip 23.976fps progressive. If he has edited the show in Avid, more than likely the pulldown cadences will vary from shot to shot, which is a huge pain in the ass to deal with. Here is how I have dealt with this.... I have only done this on TV spots, so there aren't many cuts... a longer show could take a while...
- Import the footage five times into AE, rename the clips in the project window A,B,C,D,E
- Go to interpret footage on each shot and choose a different pulldown cadence for each (this makes each clip 23.976fps).
- Drop the "A" clip into a new 23.976fps comp.
- Use the Magnum Script from aescripts.com to find the cut points and split the clip into individual layers per shot.
- Drag through the clips in the timeline to see if there are any random interlaced frames. When you find an interlaced frame, it means that it is using the wrong pulldown cadence. Select this bad clip in the timeline, then grab the B version from the project window and option-drag it into the timeline to replace the bad one. Scrub through to see if there is still an interlaced frame. If so, repeat the option drag with the other versions in the project window until the interlacing disappears.
- Check all of your cut points to make sure there are no half fields showing on the first or last frame.
If I did not understand and he truly wants to de-interlace, then
Red Giant Magic Bullet Frames or
RE:Vision Effects FieldsKit are the tickets. I usually go to FieldsKit first... they now have a motion estimation option. Sometimes it might produce a weird artifact and Bullet works better.
Matt Silverman is a
Toolfarm Forum Expert and Creative Director of Design and Digital Effects at
Phoneix Editorial in San Francisco.
Labels: Ask Matt Silverman, Avid, FieldsKit, Magic Bullet Frames
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