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Render bender (long post)
Greetings, Cutters. A couple of questions, related to each other.
1) Is it possible to send out a reference movie to compress for DVD without bright green preview material rendering? Why would I want to do this? Because….
2) I’m working with a 10-bit sequence sent as a clip from an AVID on PC. They used the AJA V210 codec to render out the clip (We use the IO with our system). The clip plays fine with everything BUT the lower thirds rendered into it. The graphic fill for the lower thirds were created in After Effects, and play FINE in real-time preview (bright green). But when I render them into the timeline there is a slight stutter at the start and stop of the graphic fill. And it is maddeningly inconsistent. Sometimes it only does it at the start, sometimes it only does it at the end, sometimes it doesn’t do it at all.
We’ve tried many, many flavors and permutations of the After Effects graphics fill—Animation, 10-bit, field rendering, masks, etc. One question: we’re using 16-bit project in After Effects. Anyone think going to 8-bit might help here?
Anyway, we need to make a bunch of DVDs while trying to solve this technical problem, but when I send a reference movie out to use in Compressor, the green preview material renders. So that ain’t working.
Momma told me there’d be days like this….
Any thoughts and ideas greatly appreciated.
Best,
Michael Colin
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2 Replies
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i would try changing the alpha settings in FCP as FCP can get confused as to what type of alpha you rendered (i.e. from straight to pre-multiplied). Also, I’d make sure that high precision YUV rendering is turned on in your sequence. You can’t export without rendering first. It’s the nature of the game.
Jeremy
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I would lay either the whole sequence or the offending clps out to tape via analog, then recapture as a single flat clip for encoding to MPEG2.
I had a situation where I needed to add a little extra speed to a clip captured from Betacam. It looked good until I rendered and then it looked poor (I suspect frame blending). I recorded the unrendered (green) clip to Betacam SP and the recaptured and it was fine.
Good luck,
Lee
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