[mythtv-users] Video Tearing

[Jay Foster]

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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