[mythtv-users] Enabiling OpenGL vertical sync

[Jean-Yves Avenard]

Hi.

Despite all my attempt to get a jitter free playback I have failed to
get something that play 100% smoothly.

During the credits or if you have text scrolling from right to left
you can clearly see the movement is slightly stuttering.
Nothing major but it's annoying me ; especially as the picture is just
perfect when using the TV built-in TV digital tuner (Sony Bravia 46"
X) just not with mythtv.

The front end is a mac mini with a 2.33GHz Core 2 Duo with an Intel
GMA 950 ; TV is connected via a DVI cable

I tried enable OpenGL vertical sync ; however I get errors on the
console and the video only show static images

2008-09-09 12:58:42.049 TV: Changing from None to WatchingLiveTV
2008-09-09 12:58:42.050 Using realtime priority.
greedyhdeint: size changed from 0 x 0 -> 720 x 576
2008-09-09 12:58:45.077 OpenGLVideoSync()
greedyhdeint: size changed from 0 x 0 -> 720 x 576
2008-09-09 12:58:48.089 OpenGLVideoSync::Start(): A/V Sync reported
error: Bad Context
2008-09-09 12:58:48.090 Video timing method: SGI OpenGL
2008-09-09 12:58:51.088 OpenGLVideoSync::Start(): A/V Sync reported
error: Bad Context
2008-09-09 12:58:51.099 VideoOutputXv: XVideo Adaptor Name: 'Intel(R)
Video Overlay'
2008-09-09 12:58:51.238 AFD: Opened codec 0x7f5ed8607a30,
id(MPEG2VIDEO) type(Video)
2008-09-09 12:58:51.238 AFD: codec MP3 has 2 channels
2008-09-09 12:58:51.238 AFD: Opened codec 0x7f5ed86080d0, id(MP3) type(Audio)
2008-09-09 12:58:51.238 AFD: codec AC3 has 2 channels
2008-09-09 12:58:51.239 AFD: Opened codec 0x7f5ed8624180, id(AC3) type(Audio)
2008-09-09 12:58:51.245 AFD: Opened codec 0x7f5ed8624e00,
id(MPEG2VIDEO) type(Video)
2008-09-09 12:58:51.249 Opening audio device 'default'. ch 2(2) sr 48000
2008-09-09 12:58:51.249 Opening ALSA audio device 'default'.
2008-09-09 12:58:51.287 NVP: Enabling Audio
2008-09-09 12:58:53.372 NVP: Timed out waiting for free video buffers.
2008-09-09 12:58:54.249 OpenGLVideoSync::Start(): A/V Sync reported
error: Bad Context
2008-09-09 12:58:54.290 WriteAudio: buffer underrun
2008-09-09 12:58:56.415 NVP: Timed out waiting for free video buffers.
2008-09-09 12:58:57.400 First A/V Sync reported error: Bad Context
2008-09-09 12:58:57.402 WriteAudio: buffer underrun
2008-09-09 12:58:59.689 NVP: Timed out waiting for free video buffers.


Has anyone had experience getting OpenGL sync working with an Intel GMA 950 ?

As a side note, I have never managed to get OpenGL working perfectly
on this machine, the deinterlacer doesn't seem to work and any white
text is blinking a lot.

Thanks
Jean-Yves