[mythtv-users] How do I get full frame rate?

[Douglas Peale]

On 10/12/2013 06:48 PM, Douglas Peale wrote:
> On 10/12/2013 06:41 PM, Stephen Worthington wrote:
>> On Sat, 12 Oct 2013 18:28:49 -0700, you wrote:
>>
>>> I had an ATI HD4850 that I was having trouble with dropped frames on (and other issues) that I just replaced with an NVIDIA
>>> GeForce GTX 760.
>>>
>>> I have just tried all combinations of decoders & renderer with no de-interlacer enabled on a 720P live auto race (it had a
>>> scrolling leader board that allowed me to tell if it was dropping frames) I had a second monitor tuned to the same channel
>>> driven by a Centronics ZAT502HD digital tuner that does not drop frames for comparison.
>>> The best I got was with the Nvidia decoder, and that appears to be 15 frames per second. I even went so far as to connect the
>>> Centronics tuner to the computers monitor, and proved that the problem was not the monitor.
>>>
>>> The system is an Intel Core I7 CPU 920 running at 2.67 GHz, 6 GB RAM doing nothing else.
>>> The display is a Dell 3008WFP 2560x1600/60 monitor connected by dual link DVI.
>>> I'm running the 325.8 64 bit NVIDIA driver.
>>>
>>> What am I missing?
>> Until you said you were using a 2560x1600 monitor, I could see no
>> reason for any problems.  What mode are you running the monitor in -
>> are you having the Nvidia drivers upscale 720p to 2560x1600, or are
>> you getting the monitor to do that (by having MythTV change the screen
>> mode to match the content being played)?  I would think the latter
>> would work.  Is that what the Centronics tuner does?  Get your monitor
>> to tell you what mode it is in while using both sources.  There is
>> usually a monitor menu somewhere that does that.
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>>
> I tried both, neither worked. Having MythTV change resolutions really screwed up my display settings since it did not change the
> resolution back when it exited, and the video was the wrong aspect ratio (tall & skinny, taller than it was wide).
>
>
>
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It is wierder than I thought.
I captured 10 seconds of video with a 1080P/60 video camera, getting part of each screen showing the scrolling text in the picture.

On the Centronics tuner, the scroll advances the same amount each frame.

But MythTV skips 1 frame, plays two frames correctly, repeats a frame plays 1 frame correctly then skips a frame. So there is a
5 frame cycle, so starting from frame 1 I would see: frame # 1 3 4 4 5 7 9 10 11 11 12 14 ... etc.
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