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

[Stephen Worthington]

On Sat, 12 Oct 2013 18:48:34 -0700, you 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.
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
>> http://www.mythtv.org/mailman/listinfo/mythtv-users
>>
>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).

A GTX 760 should be easily capable of doing what you want, even with
2560x1600.  Your i7-900 CPU is probably a little old to do it all in
CPU alone though - but you could try that and see what happens.

I am going to make some suggestions of things to check - you may well
have found all these already, but they are things I have met in the
past that have caused problems.

Do have the option set for "Separate modes for GUI and TV playback"
(Setup > Appearance > Page 2: Video Mode Settings)?  It should have
given you back the right aspect ratio for the GUI at the end of
playback if you have.  If not, it sounds like there may be a bug
somewhere.

Do you have the Paint engine setting on Auto (Settings > Appearance >
Page 1: Theme / Screen Settings)?  If you have been using older
versions of MythTV, that may still be some other value as the database
upgrades do not change it.  Auto seems to be the best setting for it
now.

Are your settings actually using VDPAU properly?  Check the CPU usage
while playing back your 720p recording - CPU use should be low.  If
not, it is not actually using VDPAU.

In your VDPAU settings, how many CPU cores is VDPAU set to use (Setup
> Video > Playback > Page 3: Playback Profiles > Edit > Max CPUs)?  On
that same screen, is the Video Renderer set to vdpau?  In the next
screen, do you have vdpauhqscaling in the Custom filters setting?

Is your dual-link DVI cable actually working in dual-link?  Is it
possible to swap it with the (presumably HDMI) cable that is known to
work on the Centronics tuner?


Some pages to look at for more ideas:

http://www.mythtv.org/wiki/VDPAU
http://www.mythtv.org/wiki/Frame_display_timing