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. -Doug
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