[mythtv-users] Bob deinterlacing drops frames, but not high CPU

[Doug Larrick]

Matt Doran wrote:
> Is this error because my refresh rate is 20040usec , which is 49.9Hz ... 
> which isn't double 25?    Isn't it being a bit picky?  :) 

Actually, technically, the calculation is that 20040 usec * 2 = 40080
usec, which is longer than 40000 so we can't display two frames (fields)
per refresh.  You need to somehow convince your video card to really do
50 Hz.

You might try raising "74.25" in your modeline by a little bit, say to
"74.26" which *should* be 50.0067 Hz.

Note that 74.25 MHz / 1980 total pixels / 750 total lines does indeed
exactly equal 50.000 Hz, so something is fishy if you're actually seeing
20040 (which is 49.899 Hz)... you should run 'xvidtune -show' which will
report what modeline you're actually using.

-Doug

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