DVL-Digest 846 - Postings: Index 16:9 Meaning Q 16:9 - "Perry" Nobody seems to have answered Robins query about D-9 storage space. D-9 or Digital-S as it was called is a so called DV-50 format because the video uses 50Mb/s. This is the same as DVCPRO-50 and twice what standard DV/DVCAM/DVCPRO use. If you could find a D-9 deck with Firewire (which apparently don't exist) then you would need to find an NLE that could deal with the D-9 codec which are also rather rare! In practice most folks would edit using uncompressed transfer on SDI or analog component the same as Digital Betacam. This occupies around 170 Mb/s for the video, although around 2:1 MJPEG compression is commonly used with some signal degradation. This brings the data rate down to a level where cheap hard drive systems can cope. Perry Mitchell Video Consultant http://www.perrybits.co.uk Meaning Q - "Perry" Ian posted: >What does "thus avoiding a tdm generation" Mean ?< Analog Betacam uses 'compression' on the chroma channels (Cr, Cb) by squashing each line into half a line and then combining the two. This is known as Time Division Multiplex or TDM. On early Betacam (pre SP) machines this was done with an Hitachi CCD chip and the results were very jittery. It was good to avoid extra generations of this process if possible, hence the Dub connector and the comment. Later BetacamSP machines had much improved tdm performance but the dub connector lived on. One disadvantage of it was that there was no drop/out correction using the Dub routing. 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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