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

[Jerry Rubinow]

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?

-Jerry
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