[mythtv] Audio sync problem with recent CVS build

[Daniel Kristjansson]

On Sun, 2005-04-10 at 22:08 +0100, Ed W wrote:
> FYI: I get lots of segfaults with ogl sync.  I haven't had time to debug 
> it, but I did do some backtraces a month or two back.   Actually, for me 
> the RTC is not smooth either - I think it's because the 1024 interval is 
> not perfect for 50Hz PAL.  I did some experimentation with other freqs, 
> but couldn't really make it smooth, have manually patched to force 
> usleep which is "smoother".  I still get occasionaly situations where it 
> jitters, but pausing and unpausing fixes it (ie it's jittering around a 
> frame redraw interval).

I believe Quicktime uses 600Hz for their clock, it can be factored
by 24, 25, 30, 50, and 60 so it can be used for film, PAL, and NTSC
with a very small framerate error. Matching the monitor refresh is
still a problem though, you really want a refresh rate of 100 for 
PAL countries and 120 for NTSC countries so you can have good
timing for video and not get unbearable flicker when using the
monitor normally.

-- 
Daniel Kristjansson <danielk at cat.nyu.edu>