[mythtv-users] Internal player jerky

[dargllun]

On 09.12.2010 14:17, dargllun wrote:
> after the recent upgrade from 0.23.1 to 0.24 I noticed that the internal
> player isn't playing as smooth as before. I'm using the same kernel and
> graphics stack, yet the scroll text on the news channel shows visible
> jerks. In 0.23 I was unable to notice any jitter.

I think I found the reason:

When watching live-tv, the automatic frame rate adaption (as per [1]) 
doesn't work. So, by default, my display runs @ 60Hz, and should be 
switched to 50Hz when watching live-tv (I live in a PAL country). But it 
is not switched, as xrandr confirms.

When I record that very show, and then play it back from the recordings 
list, the display is correctly switched! I created two dedicated -v 
none,playback logs. Just looking for the switching statements show for 
live-tv:

$ grep Trying log.tv
2010-12-09 19:31:00.076 VideoOutput: Trying video renderer: 'xv-blit'
2010-12-09 19:31:00.105 Trying to match best refresh rate 25.000Hz
2010-12-09 19:31:00.105 Trying 1920x1080 50.000 Hz
2010-12-09 19:31:01.914 Trying to match best refresh rate 0.000Hz
2010-12-09 19:31:01.914 Trying 1920x1080 0.000 Hz

And for the recording:

$ grep Trying log.rec
2010-12-09 19:38:56.017 VideoOutput: Trying video renderer: 'xv-blit'
2010-12-09 19:38:56.030 Trying to match best refresh rate 25.000Hz
2010-12-09 19:38:56.030 Trying 1920x1080 50.000 Hz

If filed a bug report for this [2].

Best Regards
greg

[1] http://www.mythtv.org/wiki/User_Manual:JudderFree
[2] http://svn.mythtv.org/trac/ticket/9349