[mythtv-users] 60hz too slow for NTSC + Bob deint?

Doug Larrick doug at ties.org
Tue Apr 18 12:28:25 UTC 2006


Jesse Guardiani wrote:
> Hello,
> 
> Is 60hz just too slow for NTSC + Bob deint?
> Or is something lying?
> 
> I get this when I try to play back NTSC video
> on my LCD TV running 60hz:
> 
> 2006-04-16 22:54:19.226 OpenGLVideoSync: x,y -> 720, 450
> 2006-04-16 22:54:20.944 NVP: Timed out waiting for free video buffers.
> 2006-04-16 22:54:21.338 Using OpenGLVideoSync
> 2006-04-16 22:54:21.338 Set video sync frame interval to 33366
> 2006-04-16 22:54:21.338 Video sync method can't support double framerate
> (refresh rate too low for bob deint)
> 2006-04-16 22:54:21.339 Set video sync frame interval to 33366
> 2006-04-16 22:54:21.342 Using deinterlace method bobdeint
> 2006-04-16 22:54:21.354 Using audio as timebase
> 2006-04-16 22:54:21.354 Video timing method: SGI OpenGL
> 2006-04-16 22:54:21.354 Refresh rate: 16697, frame interval: 33366
> 
> 16697 > 33366 / 2 
> 
> And according to vsync.cpp, that's a problem.
> I something lying, or are those numbers correct?
>

Do you have a default timestretch factor turned on?  That can push the
required refresh rate too high.

But actually, 16697 corresponds to 59.89 Hz vertical refresh... this is
fractionally less than the 59.97 that you actually need.  Sounds like
you need to play around with your modeline.

-Doug

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