[mythtv-users] How to improve 720p playback (1080i ok)?

[Robert Johnston]

On 29/11/2010 10:12 PM, Jerry Rubinow wrote:
> I've been fooling around running mythfrontend compiled under Windows,
> got that working.  I can playback 1080i content without glitches, but
> 720p content has frequent pauses, due to throwing away frames when the
> audio gets ahead of the video.
>
> In the logs, I've verified it's using Direct3D for playback.  I've tried
> different minimal profiles, with a deinterlacer of Onefield, Linear
> Blend, and None (no filters in all cases), with no change in results.
>   The content that plays fine is 1080i 30Hz, and the content that
> doesn't is 720p 60Hz.
>
> For the 720p content, myth is using in the low 30's % CPU, and for the
> 1080i, high 30's.  The monitor is 60Hz.
>
> Any suggestions?

Try turning off (Or forcing off in the driver's control panel if it's 
already off) vsync. It may be that Myth is just a frame slow, and the 
driver is stopping it from updating late.