[mythtv-users] 0.16: How to enable new vsync code and bob deint?

Doug Larrick dougl at charter.net
Mon Sep 13 14:54:48 EDT 2004

Thomas Börkel wrote:

> Why not use nVidia timing with 61xx, if OpenGL is not available? Also, 
> can it be built with OpenGL support, but run without?

nVidia (the company) removed or broke the /dev/nvidia0 retrace function 
in recent drivers.  There is no driver that supports both; drivers prior 
to 61xx that seem to support OpenGL are actually broken in various ways 
and can crash.  And no, if you've build with OpenGL support and your 
hardware supports it, there's no way to disable it.

>> * Most others should see /dev/rtc timing.  If not, check permissions 
>> on /dev/rtc and the contents of /proc/sys/dev/rtc/max-user-freq 
>> (should be 1024; if not, arrange for it to be so, probably with the 
>> 'systune' package).
> /proc/sys/dev/rtc/max-user-freq is 64. What's the systune package?

If you're on Debian: 'apt-cache show systune' will tell you.  It's a 
package for managing settings like this under /proc so they're reapplied 
at boot.  For testing you can just 'echo 1024 > 
/proc/sys/dev/rtc/max-user-freq' (as root); it will hold until you reboot.

> What did we have in Myth 0.15, if A/V sync was off?

Experimental A/V Sync tried to use /dev/nvidia or DRM, or failing that 
would use a poor sleep implementation.  Video as Timebase tried to use 
/dev/rtc or a different poor sleep implementation.  With neither 
selected it would use sleep with busy-wait if "jitter reduction" was on, 
or just sleep if not.  OpenGL is new.

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