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

Jerry Rubinow jerrymr at gmail.com
Fri Dec 3 05:34:01 UTC 2010

On Tue, Nov 30, 2010 at 10:38 PM, Jerry Rubinow <jerrymr at gmail.com> wrote:

> 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?
With more investigation, I've found mpeg 480p, 720p and 1080i all play back
ok.  It is H264 720p which does not.  Any ideas what to look into?

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