[mythtv-users] Video Tearing
Jay Foster
jayf0ster at roadrunner.com
Sun Oct 19 18:03:10 UTC 2014
On 10/18/2014 08:32 PM, Daryl McDonald wrote:
>
>
> On Sat, Oct 18, 2014 at 10:21 PM, Jay Foster <jayf0ster at roadrunner.com
> <mailto:jayf0ster at roadrunner.com>> wrote:
>
> I'm setting up a new mythbuntu 14.04.1 system with an nvidia GT730
> video card (nvidia 331 driver). I am trying to get rid of the
> tearing. I have been following the suggestions at
> http://www.mythtv.org/wiki/Frame_display_timing, but I am not
> having any success. I have added the udev rule to change
> permissions on /dev/rtc and verified that they are correct. I
> have added an entry to /etc/sysctl.conf to set the max-user-freq
> and verified that it is correct.
>
> The output of mythtvfrontend.real -v playback:
> 2014-10-18 19:06:55.555103 I VDP: GetFilteredDeint() : xv-blit ->
> 'linearblend'
> 2014-10-18 19:06:55.555437 I FilterManager:
> GetFilterInfo(convert) returning: 0x0
> 2014-10-18 19:06:55.555446 I FilterManager:
> GetFilterInfo(linearblend) returning: 0x3d7b320
> 2014-10-18 19:06:55.555468 I VideoOutput: Using deinterlace
> method linearblend
> 2014-10-18 19:06:55.555482 E VSYNC: DRMVideoSync: VBlank ioctl
> did not work, unimplemented in this driver?
> 2014-10-18 19:06:55.555498 E VSYNC: RTCVideoSync: Could not set
> RTC frequency:
> eno: Permission denied (13)
> 2014-10-18 19:06:55.555687 I Player(0): Video timing method:
> USleep with busy wait
> 2014-10-18 19:06:55.555697 I Player(0): Display Refresh Rate:
> 59.869 Video Frame Rate: 59.941
> 2014-10-18 19:06:55.555703 I Player(0): SetFrameInterval ps:1 scan:1
> 2014-10-18 19:06:55.556536 I playCtx: StartPlaying(): took 0 ms
> to start player.
>
>
> ls -l /dev/rtc*
> lrwxrwxrwx 1 root root 4 Oct 18 19:05 /dev/rtc -> rtc0
> crw-rw-rw- 1 root root 254, 0 Oct 18 19:05 /dev/rtc0
>
> cat /proc/sys/dev/hpet/max-user-freq
> 1024
>
> Any ideas on what to try next?
>
> Jay
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>
> I have better luck with the 304 driver, and tearing with the 331.
>
>
>
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The 304 driver does not support the GT730. I purchased an older GT630
in case I need to go that route (downgrade to 304), but haven't gone
there yet. I don't see how using either the 304 or th 331 driver would
affect MythTV's ability to use RTC sync. Even with the permissions set
to world read/write, MythTV still reports permission denied.
I see the line in the mythfrontend log, "Display Refresh Rate: 59.869
Video Frame Rate: 59.941". How could I ever expect smooth output when
the program frame rate and the display frame rate are just out of sync?
Jay
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