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Interlaced Video in Davinci
I am grading an SD 25fps interlaced project. We exported a QT from FCP and cut it up with an EDL. We were experiencing some nasty jitters on some shots. We think it may be blurs causing the jitter. Then we realised that “Enable video field processing” was not ticked and turned it on. This dramatically improved the jitter. However, there is now a slight but noticable jitter present on all the material which goes away when we untick field processing.
Is this a common problem, a “feature” of Davinci or what?
Many thanks
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5 Replies
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David, I’ve done two SD (NTSC) projects in DaVinci and have had a number of annoyances with Quicktime renders describing the exact problems you have indicated. (turning interlaced fields on and off provides different results, but neither look as good as the original footage). Also a quick check of the exported file in FCP has revealed that uncompressed and prores exports from resolve always results in an “upper odd field first” file even when enabling interlaced fields on both the project settings and the render settings tab, this is the issue I believe (but for PAL that would actually be fine, so not sure there).
My foolproof solution for both projects: use the SDI output and Powermaster to tape from DaVinci and record that signal on something else (be it a tape deck or another computer with an SDI capture card). I have a second system at the office with a Decklink card installed in it and I record the feed via SDI there in whatever format I need (uncompressed or prores). This has always yielded the best results with no interlacing issues. I would highly reccomend this for an SD project.
Note: I’ve done two 1080i projects in Resolve and they were just fine rendered out as interlaced quicktimes. Its just the SD projects that I’ve had the interlacing issues on renders.
Chris Hall
Colorist – Basher Films
Pasadena, CA -
I have a similar problem but I need to upconvert a NTSC SD program to HD 59.94. Any ideas on best workflow?
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Fcp fields act bad for me mostly.
Something i ever did not experience on my pc based premiere.Lets say i will put in the timeline material that is progressive
and leave fields to non and all goes blocky or order is reversed.I think it is important to get perfect results from fcp to see if it makes things better.
I always test on regular crt tv or monitor with fields.Secondly field order is also big key. Some material that comes in to fcp seems fine
but when you export it will go mad. Timelines and projects are fine but the material
has a problem with fields and fcp can not solve this.So i see there is a lot of options that make things go bad.
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Margus
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If you de-interlace in fcp prior to resolve and send this footage to media pooka does it help? No good if you need interlaced output of course but just curious?
Post Production in Brighton
Follow us @onlinecreative
http://www.online-creative.com -
This is what I did in the end. The project needed a film look anyway so I bought a de-interlace plugin for FCP and di a more thorough “pre-grade”. Seems that DaVinci wouldn’t cut it if we did need to finish in interlaced SD…
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