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

Jerry Rubinow jerrymr at gmail.com
Wed Dec 1 03:38:22 UTC 2010

On Mon, Nov 29, 2010 at 11:59 PM, Jerry Rubinow <jerrymr at gmail.com> wrote:

> On Mon, Nov 29, 2010 at 11:15 PM, Robert Johnston <anaerin at gmail.com>wrote:
>> 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.
> Good thought.  I went into the driver's 3D settings, and set vsync to Force
> Off.  Unfortunately, no effect.  OpenGL VSync in myth settings is also
> unchecked.  Is there another setting somewhere?

Anyone have any other ideas?

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