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720p 60 to 1080i 59.94 field dominance problem
We received a 720p 60 project which we are trying to lay off to HD Cam 1080i 59.94. We have been doing the conversion using either our Kona card and have also tried our UFC 1800. We have no problem doing the print to tape and the image looks great however we are noticing that on our record tape, some of the cuts happen on field 1 and some happen on field 2. This will be an issue when we do tape to tape color correction on this project. Any suggestions about how to clear up this problem?
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4 Replies
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Interesting point. The Kona accurately maps the 60P frames to 60i fields. If your cutting is done in 60P, you can see how this could result in some cuts on what will end up as field 2 in 60i.
I take it all you have to start with is a 720p60 tape? The best solution would be to go back to the 720p60 project and only cut on the even frames.
You could ingest the 720p60 project in its native form and cut out frames so that it only cuts on the even ones. But you will lose the number of frames that are currently on the wrong field.
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We do actually have the FCP project and could go in and adjust edits. We figure that any edit that starts on an odd numbered frame in the 720p 60 project will translate to a field 2 edit when we go to 1080i. Using this logic, we would make all edits start on even numbered frames to keep field domniance to field 1. If they plan on going to DVD, don’t field dominance changes become a big problem?
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Not really that up on field dominance. As far as your 1080i transfer is concerned, I think it would have normal field dominance, but the scene-by-scene color correction is a problem in 1080i if a scene essentially contains a field from a different scene. You would get one-field color changes in that scenario. Unless you can color correct at 720 and only do a final transfer at 1080, it seems like you’ll have to fix the edits.
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we let the daVinci auto mark a list as we played the tape back and it identified F1 and F2 edits so it looks like we will not be getting color pops when we lay back. Does anyone out there know if this is simply a case of needing to cut on even frames in a 720p project when you know you will eventually be delivering on 1080i? or is there some other way to avoid this issue? As we add graphics this could be problematic if we want a graphic to go cut to cut.
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