[mythtv-users] Poor HD Playback

[Tom Dexter]

On Wed, Apr 22, 2009 at 10:37 AM, Jay Foster <jayf0ster at sbcglobal.net> wrote:
>
>> On Tue, Apr 14, 2009 at 4:49 PM, Jay Foster <jayf0ster at sbcglobal.net>
>> wrote:
>> >
>> > I am new to MythTV, and have spent quite a bit of time
>> resolving many other
>> > issues.  I haven't been able to get much improvement
>> with the HD playback,
>> > and rather than continuing with the trial and error
>> approach, I would like
>> > some suggestions on what might work best to improve
>> this.
>> >
>> >
>> >
>>
>> ...one other thing to look into:  It's possible your
>> problems are
>> related to frame timing:
>>
>> http://www.mythtv.org/wiki/Frame_display_timing
>>
>> I'm currently using RTC which seems to work just
>> fine.  I was using
>> OpenGL which worked fine as well, but had a tendency to
>> lock the the
>> system up in combination with opengl screen savers.
>>
>> Tom
>>
> Thanks, Tom, that looks relevant.
>
> From my frontend log:
>
> 2009-04-21 18:50:23.865 Realtime priority would require SUID as root.
> 2009-04-21 18:50:23.865 VDP: GetFilteredDeint() : xv-blit -> 'bobdeint'
> 2009-04-21 18:50:23.865 Using deinterlace method bobdeint
> 2009-04-21 18:50:23.968 nVidiaVideoSync: VBlank ioctl did not work, unimplemented in this driver?
> 2009-04-21 18:50:23.968 DRMVideoSync: Could not open device /dev/dri/card0, No such file or directory
> 2009-04-21 18:50:23.968 RTCVideoSync: Could not open /dev/rtc, Permission denied.
> 2009-04-21 18:50:23.968 Set video sync frame interval to 33366
> 2009-04-21 18:50:23.968 Video sync method can't support double framerate (refresh rate too low for bob deint)
> 2009-04-21 18:50:23.968 Set video sync frame interval to 33366
> 2009-04-21 18:50:23.969 VDP: GetFilteredDeint(onefield) : xv-blit -> 'onefield'
> 2009-04-21 18:50:23.969 Using deinterlace method onefield
> 2009-04-21 18:50:23.969 Using audio as timebase
> 2009-04-21 18:50:23.969 Video timing method: USleep with busy wait
> 2009-04-21 18:50:23.969 Refresh rate: 16702, frame interval: 33366
>
> So it's using USleep with busy wait.  I changed the permissions on /dev/rtc0 to be a+rw, but I still get a permission denied message, but no longer on the open().  It has also been my experience that changing the permissions of /dev devices is only temporary.  They seem to get reset after a reboot.
>
> 2009-04-22 05:55:51.580 RTCVideoSync: Could not set RTC frequency, Permission denied.
> 2009-04-22 05:55:51.580 Set video sync frame interval to 33366
> 2009-04-22 05:55:51.580 Video sync method can't support double framerate (refresh rate too low for bob deint)
> 2009-04-22 05:55:51.580 Set video sync frame interval to 33366
> 2009-04-22 05:55:51.581 VDP: GetFilteredDeint(onefield) : xv-blit -> 'onefield'
> 2009-04-22 05:55:51.581 Using deinterlace method onefield
> 2009-04-22 05:55:51.581 Using audio as timebase
> 2009-04-22 05:55:51.581 Video timing method: USleep with busy wait
> 2009-04-22 05:55:51.581 Refresh rate: 16702, frame interval: 33366
>
> It is also NOT using bob2x but the fallback of onefield.
> I have also discovered that NVidia cards do not support XvMC:
>
> 2009-04-22 06:11:18.313 DPMS Deactivated
> 2009-04-22 06:11:18.350 VideoOutputXv Error: XvMC output requested, but is not supported by display.
> Xlib:  extension "XVideo-MotionCompensation" missing on display ":0.0".
>
> I tried checking the OpenGL Synch box, and the log showed it using it, but it made no difference in the display quality:
>
> 2009-04-22 05:52:11.084 DRMVideoSync: Could not open device /dev/dri/card0, No such file or directory
> 2009-04-22 05:52:11.084 OpenGLVideoSync()
> 2009-04-22 05:52:11.086 OpenGLVideoSync: x,y -> 640, 384
> 2009-04-22 05:52:11.106 Using OpenGLVideoSync
> 2009-04-22 05:52:11.106 Set video sync frame interval to 33366
> 2009-04-22 05:52:11.106 Video sync method can't support double framerate (refresh rate too low for bob deint)
> 2009-04-22 05:52:11.106 Set video sync frame interval to 33366
> 2009-04-22 05:52:11.106 VDP: GetFilteredDeint(onefield) : xv-blit -> 'onefield'
> 2009-04-22 05:52:11.107 Using deinterlace method onefield
> 2009-04-22 05:52:11.109 Using audio as timebase
>
> I would think someone has gotten this to work.  Should I be looking for a different (non-NVidia) video card?  One that supports DRI?
>
> Jay

Since you were able to get opengl vsync enabled, and that didn't
correct things, then that's not the issue apparently.  By the
way...the permissions problems with RTC may be related to this:

http://www.mythtv.org/wiki/Frame_display_timing#Adjusting_the_RTC_Interrupt_Frequency

...that is, it's probably trying to set the frequency higher than the
max allowed...but again, I don't think RTC will change anything.

You're not going to be able to use Bob x2 or the new Interlaced x2
without that 2903 patch.  The only "official" patch to that issue is
very new and was actually only committed to trunk:

http://svn.mythtv.org/trac/changeset/20277

So the binary you have definitely won't have it.  I'm running under
Gentoo with my own modified ebuild with that patch and others.  The
only binary packages I'm aware of with that patch (as well as the new
Interlaced x2 deinterlacer) are the ones Jean-Yves Avenard has built:

http://www.avenard.org/media/Ubuntu_Repository/Ubuntu_Repository.html

Tom