DVL-Digest 850 - Postings: Index Best 4:2:2 formats for archive and interchange? How to output MPEG-2 @ 4:2:2 -- 422P@ML JVC DV500 as VTR please HELP - Premiere 6/Mac G4 problem Best 4:2:2 formats for archive and interchange? - Adam Wilt As most people know, DV is a 4:1:1 format and thus stores less image > information than good 4:2:2 formats. Half the color resolution, all the luma resolution -- though both luma and chroma suffer from DCT compression artifacts. > MPEG-2 is a 4:2:2 format, so outputting to MPEG-2 is an option. Outputting at 50 Mbits/sec for MPEG-2 (and thence to D-9 or DVCPRO50 or IMX tape) is a valid option. So is Digital Betacam. > Beta SP is 4:2:2, but it's analog. As discussed, Beta isn't 4:2:2. If it were a digital format and subject to the same sampling calculations, it could perhaps be characterized as 3:1:1! > I'm not even sure which digital 4:2:2 format would be best. D-5 would be best. D-1 (a bit of a dinosaur these days) is next. Then DigiBeta, then D-9 / DVCPRO50 / IMX 50 Mbit. Then IMX 40 Mbit, then IMX 30 Mbit. None of these can be considered inexpensive, with the possible exception of D-9. Below that DV, DVCAM, and D-7 (DVCPRO) are the best, yes, even at 4:1:1. Bear in mind that DVD is low-bitrate MPEG-2 at 4:2:0, and it still looks OK. 4:1:1 and 4:2:0 aren't the End of Life As We Know It. Cheers, Adam Wilt How to output MPEG-2 @ 4:2:2 -- 422P@ML - "Perry" Geoff: You are right in the heart of Sony's Broadcast MPEG strategy with BetacamSX and IMX formats. IMX is the I frame only 50MHz version you referred to. Perry Mitchell Video Consultant http://www.perrybits.co.uk JVC DV500 as VTR - "Perry" Zach: It is true in Europe (PAL) that the DV input is disabled, you don't say where you are based. Perry Mitchell Video Consultant http://www.perrybits.co.uk please HELP - Premiere 6/Mac G4 problem - Adam Wilt ...I'm pretty sure I've got a corrupted clip that has infected the project. What most people have the best luck with is the "binary chop": move half your clips offline, and see if Premiere launches without hanging (It'll complain about missing media, of course). If so, restore half the clips and try again; if not, remove half the remaining clips and try again. Repeat until you narrow things down to the offending clip or clips, delete it/them, restore the rest, and resume work. Tedious, I know. If you have some idea of which clips are the troublemakers, try taking them offline first before performing the blind binary chop. [The easiest way to take clips offline is to create a new folder and simply move the clips into it. There's no copying of the clip data this way and restoring the clips is done my moving them back.] Cheers, Adam Wilt (diese posts stammen von der DV-L Mailingliste - THX to Adam Wilt and Perry Mitchell :-) [up] |
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