DVL-Digest 874 - Postings: Index Apple looking for speed? DV Vs. 601(too much information) Apple looking for speed? - "Perry" 1 GHz, 2GHz, who cares!! What we really want to know is how long does it take, and the two are not necessarily related! Also irrelevant to me is running business and game playing benchmark tests. Why can't we have a general video benchmark, with a bunch of common cross platform applications like Premiere and After Effects rendering; and MPEG encoding based upon the fastest platform software. If the Apple DVD encoder (MPEG2) can genuinely run at half real speed, or even the realistic quarter speed reported, then it makes a G4 a real speed contender against any Windows rival, whatever the numbers. When I can get After Effects, Photoshop, Illustrator, a decent NLE and all the assorted support applications to run on your Unix cousins then I may think about the consequences. Meantime I'll put up with the odd crash and try and use the computers to do something useful. Perry Mitchell Video Consultant http://www.perrybits.co.uk DV Vs. 601(too much information) - "Perry" You guys seem to have covered most of the bases! Just to add that company politics and marketing , and industry standard bodies like SMPTE/EBU/IEEE can make the whole deal quite confusing at times! DV and '601 are digital formats for encoding video, IEEE-1394 (aka Firewire and iLink) and SDI are the normal means to transport them respectively. SDTI is a collective term for sending various forms of professional compressed video down an SDI type transport. SDI and SDTI started life as Sony and Panasonic terms respectively, so some confusion is probably inevitable! Concerning quality, uncompressed '601 video consumes about 7x the data rate of DV. The difference on typical images with the same source camera is difficult for an untrained eye to see. The real problems with DV concern the use of difficult computer graphic material, and the use of chroma-key which demands an artificially high level of performance from the chroma channels. One solution to this is to use compressed '601 such as D-9 (Digital-S) with compromise data rates and yet full 4:2:2 mapping. These are all intra-frame based technologies, inter-frame based compression such as MPEG offers much higher efficiency and would seem (to me) to be an inevitable steam roller. Only short term restrictions involving processor power and cost of memory make it sometimes awkward to use. Like all modern technology, you should make purchasing decisions based upon using the equipment TODAY. If it works well today, it will work well tomorrow and next year whatever other technology gets developed. If you want to buy video equipment that can be guaranteed to still be competitive in say 5 years time, then you are in lottery land! just my two penn'orth! Perry Mitchell Video Consultant http://www.perrybits.co.uk (diese posts stammen von der DV-L Mailingliste - THX to Adam Wilt and Perry Mitchell :-) [up] |
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