Gareth Davis wrote: > Why would it be? SDI is the usual way we send SD digital audio and video > round the studios. The bitrate may be high, but it is still interlaced > SD resolution video. I can't remember the various different bandwidth > figures for HD SDI, and I can't be bothered digging through my training > notes from Wood Norton now - But I think they are measured in Gbps.
Most HD-SDI (ie. 1080i50 or 720p50) is up to a nominal 1.5Gbps. Anything higher resolution (eg. 1080p50) needs cables capable of 3Gbps or dual-link existing cables. Note the rather nifty Dirac Pro solutions to avoiding having to upgrade cables - able to compress 1.5Gbps into 270Mbps to run over SD links with fairly low quality loss, and to compress 1080p or 1200p (up to 3Gbps) to run over a single 1.5Gbps link losslessly. Great work, Tim & Co! -jeremy - Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. Unofficial list archive: http://www.mail-archive.com/backstage@lists.bbc.co.uk/
