Broadcast format used for HBO HD
Posted 29 November 2005 - 01:28 PM
Posted 29 November 2005 - 01:34 PM
The final HDTV transmission is much more compressed than what's on the original HD tape.
Edited by David Mullen, 29 November 2005 - 01:34 PM.
Posted 16 December 2005 - 10:45 PM
Seachange http://www.schange.c...adcast/main.asp is what HBO uses and is the most popular probably. Even local TV stations use video servers for spot playback and most have moved to fully automated video servers.
When I worked at a CBS affliate I had a chance to talk to CBS master control and asked what they used to playback their programs. I don't remember what they were doing for HD I know our sister station had D5 and HDCAM VTRS. What was interesting was the guy told me that they maily use a video server but that some times they would play shows off D-1 VTRs like The Price is Right and in that case their are always two copies of the tape and they are synced together so that if one tape falied you could go to a backup. Is all about redundancy. Our TV station had two digital satellites,one analog,and a microwave feed from a sister station all carrying the CBS network.
Personally I think most of HD tv looks like garbage because of how many times it gets recompressed. DVCRPRO HD and HDCAM original footage looks prestine, water falls don't look blocky, sports doesn't break up etc... Problem is after they capture theat prestine footage in a mpeg on a video server then they compress again to broadcast it then the cable and sat company receive on their equipment and recompresses it again to mpeg to fit in their bandwith allocation system (most digital sat systems do varible bit rate encoding and monitor all channels and allocate bandwith to channels that need it the most at the time, ie. lots of motion,detail etcc..)
Edited by johnhollywood, 16 December 2005 - 10:47 PM.