DVL-Digest 651 - Postings: Index Sony "Super D8"? VX2000 Still Pics Sony "Super D8"? - Adam Wilt And I've been thinking about D8. The .25-inch wide tape enables both > fields to be recorded in one pass across the tape. Now if one went to > the DV scheme of 1 field 1 pass -- it would be possible to double the > data rate in each pass to 50Mb/s. (Of course, recording duration would > drop by 50%.) Hmm, you mean like DVCPRO50 does -- or D-9, which uses the even more mundane VHS cassette form factor? [Actually, NTSC DV records each frame in 10 tracks, PAL in 12 tracks: segmented recording, just like quadruplex! :-) ] > If one had a budget of 50Mb/s one could record 480p60. As DVCPROProgressive does? Panasonic and JVC have been there, done that... Sony is starting to overcome their blinkered market-segmentation rigidity and are even starting to admit that DV25 *may* be as useful and capable as (shudder) BetaSX -- but their 50 Mbit play is IMX using MPEG-2, not DV50. Yes, the consumer division could do it, but they'd need to see a market. Even in pro/industrial/broadcast, the DV50 formats are off to slow starts, and both vendors have tacitly (or explicitly) admitted that DV25 is good enough for the vast majority of their customers, hence the belated emergence of the JVC ProDV and Panasonic ProLine DV products. D8 piggybacked off the work that went into DV compression and the Video8/Hi8 transport and tape format, hence its low cost. The Sony consumer group would have to do its own, expensive engineering to get the 50 Mbit stuff working as they can't borrow it from the rest of Sony -- unless it were MPEG-2! :-) But unless a market demand for improved quality or 60p shows up (and there doesn't appear to be any such "pull" so far), seeing 50 Mbit consumer cams in the near future seems unlikely. My 0.02USD, and worth it, too! Adam Wilt VX2000 Still Pics - "Perry" Charles Pope posted: >The stills are much sharper than the video captures. I've noted a parallel (though less dramatic difference) between photo mode and full-frame freeze captures from the VX1000 (photo mode has a lot less noise).< Photo mode on the VX1000 uses a single field interpolated to a frame. The VX2000 uses the full frame. You cannot use a pure progressive scan for interlaced video because you would get excessive interlace 'twitter', so the video version will have less vertical resolution. What intrigues me is why the stills version should have more colour - any theories? Perry Mitchell Video Facilities 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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