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Delivering to SD 29.97 from DVCPRO-HD 720p24
Getting ready to deliver a project (for broadcast) shot (HVX200 with P2 cards worked flawlessly) and edited at DVCPRO-HD 720p24.
Delivery is 4:3 Full Frame SD (Digibeta). Will need to do occasional reframing for 4:3.I would prefer to do a hardware conversion but I don’t believe my Blackmagic Decklink HD Pro will do a Center-Cut (Crop) down-conversion from DVCPRO-HD 720p24 to NTSC 29.97. If there is a way to make the Blackmagic card do it, great. If the AJA Kona 3 can do it I would consider buying one.
Otherwise, what’s the best software conversion workflow? My thoughts were to either render out the DVCPRO-HD in a 10bit 24p SD sequence and output to Digibeta adding a pulldown or do basically the same thing but have compressor do the rendering. (I imagine it’s best to introduce the 3:2 pulldown upon final output.)
How big of a difference in quality will there be between a rendering down to SD instead of a hardware downconvert?
Is there a much better solution?Thanks.
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3 Replies
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Kona will add the pulldown and do the center crop in realtime on the way out. I’ve cut 24p projects in the past and simply output directly to DVCAM or BetaSP from the 720p/24 timeline via a Kona 2 on our old system.
Walter Biscardi, Jr.
https://www.biscardicreative.com
HD Editorial & Animation for Food Network’s “Good Eats”
HD Editorial for “Assignment Earth”“I reject your reality and substitute my own!” – Adam Savage, Mythbusters
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I have no experience with the Decklink, but do know the Kona cards. The Kona 3 can output to Digibeta performing a 4:3 center extraction in real time. But, if you need to adjust framing like you mentioned, then it might be wise to copy your sequence and paste it into a 10-bit uncompressed SD timeline and render it, repositioning the shots that you need repositioned.
Hmm…doing that at first will result in the footage showing up as letterboxed, so you will have to adjust the framing first to fill the screen. It might be better to export a QT ref movie, reimport it, and drop that into a 10-bit uncompressed timeline as it would show up as one clip. Then you resize it once, and where the shots are that you need to reposition, ravor on the edit and reposition.
Just a few ideas.
Shane
Littlefrog Post
http://www.lfhd.net -
Thanks guys. Looks a lot easier to get a Kona card then all that rendering..
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