MPEG-2 encoders and > decoders know how to recognize 24P material that is doubled (3/5) to fit in > 60P, so very little bandwidth is actually wasted. Maybe some encoders do, and maybe more today, but when I checked back in Detroit 2-3 years ago none of the OTA broadcasters were using any telecine flags. I think here in Jax I may have seen one (NBC?) that does but I have not systematically checked them all recently. - Tom Stephen W. Long wrote: > Dan, > > An engineer at a major network explained it to me this way - do you want to > risk losing eyeballs (customer changes the channel) every time you go to a > commercial or come back to a program? Since there is no guarantee > whatsoever that consumer equipment will properly behave when different > formats are received (my CRT HDTV goes blank every time the format changes > BTW), the broadcaster can only control his end - thus upconvert or cross > convert every signal to your base "master" signal. MPEG-2 encoders and > decoders know how to recognize 24P material that is doubled (3/5) to fit in > 60P, so very little bandwidth is actually wasted. > > Stephen > > At 06:21 PM 11/9/2005 -0800, you wrote: > >>In response to some of the discussion about formats, I have another >>question. Why do broadcasters put out a fixed format stream when at the >>production level the format is different. For instance, if Fox puts out >>720@60P all the time, and the original production content is 24P, why would >>the broadcaster waste bits by sending several frames of the same picture? >>Why not send out 720@24P and use the 19Mb/s to send a less compressed >>picture? Or how about when a 640x480@30i is sent out 720@60P? Is it a >>problem with the master control switcher only switching one format, or the >>server, or is the problem on the customer's end (like the monitor won't >>naturally switch)? Is it simply easier that way? I would think a lot of >>efficiency could be gained there. >> >>Dan >> >> >>---------------------------------------------------------------------- >>You can UNSUBSCRIBE from the OpenDTV list in two ways: >> >>- Using the UNSUBSCRIBE command in your user configuration settings at > > FreeLists.org > >>- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word > > unsubscribe in the subject line. > >> > > > ---------------------------------------------------------------------- > You can UNSUBSCRIBE from the OpenDTV list in two ways: > > - Using the UNSUBSCRIBE command in your user configuration settings at > FreeLists.org > > - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word > unsubscribe in the subject line. > > ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.