On Friday 20 May 2005 02:07, Doug Larrick wrote: > Bernd Paysan wrote: > > The main difference is obvious when switching from ProSieben to HD1: > > > > 2005-05-19 22:41:44.184 AvFormatDecoder: Video has changed from > > 1920x1080 to 1920x1088. > > > > Apparently the 1920x1088 mode is decoded fine, while the 1920x1080 > > doesn't. > > Interesting that you have a video that's 1080 lines high. Here in the > US all the "1080i" content that we have is actually 1088 lines, with the > bottom 8 lines defined to be blank. MythTV actually has special code > that sets the output to 1080 lines if it is given a 1088-line video, to > avoid a black band at the bottom, and avoid scaling when outputting to a > 1080-line display. > > The macroblocks in the ATSC MPEG stream are 16 pixels high, which is an > integer divisor of 1088 but not 1080. A 1080-line video would imply > that the macroblocks are 8 (or 4; unlikely) pixels high. I can see this > breaking a decoder or being beyond the capability of some system.
As far as I can see from other discussions about the ProSieben HD stream, it's really 1088 high, so the macro-blocks are 16 pixels, but it seems to tell the resolution is 1920x1080. Maybe that's even more confusing. -- Bernd Paysan "If you want it done right, you have to do it yourself" http://www.jwdt.com/~paysan/
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