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Downconverting 720p30 to SD in SD Sequence
Several of us on various forums have been trying to figure our the best way to downconvert HDV material into SD. Consensus is, don’t try it in FCPro natively. Always export. This is because the HDV material when scaled down, aspect corrected, and interlaced into an NTSC sequence will look very poor compared to the exported conversion to SD via QT or Compressor. So, is that the final word? But what if you need to edit that down conversion. Or simply need to add a few shots from HDV into your SD project?
Several settings in a NTSC sequence seem to have some effect on the poor results of native down conversion. – motion sampling, fields, ect. In my case, I have 720p30 footage. One question I have is this. If I take progressive 30 (29.97) footage and drop it in a interlaced 29.97 sequence as letterbox, shouldn’t each field be exactly 1/2 the progressive frame? And if played back, will simply reproduce the whole 1/30 every two fields? (unless the sequence interprets the first field on the break between frame one and two)
In FCPro, it’s the fields that are causing me problems with the down conversion. If I turn off fields in the NTSC sequence, the 720p30 material then looks like the same material exported to SD via Quicktime. With field set to lower, or “Even” (720×486) , the image breaks up and causes aliasing in the NTSC sequence. Horizontal lines are stairstepping. Turn off interlacing and it looks 1000% better. I think I’m on to something, a way perhaps to have FCPro correctly interpret the fields of 30p source. Yet turning off fields is NOT the answer because you can’t add NTSC footage produced at 29.97i without it then looking poor.
Dave B
Dave Beaty
Dreamtime Entertainment
1625 SE 46th St
Cape Coral FL 33904
239-549-4081
800-446-7575
da**@********************nt.com
http://www.dreamtimeentertainment.com -
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