[mythtv-users] AVSync2 with sports

Tim Draper veehexx at zoho.com
Sun Feb 17 20:45:37 UTC 2019

 ---- On Sat, 16 Feb 2019 19:53:13 +0000 Peter Bennett <pb.mythtv at gmail.com> wrote ---- 
 > On 2/16/19 2:01 PM, Tim Pletcher wrote:
 > > I was watching basketball today and I noticed the on-screen motion 
 > > appeared to be jerky or hitching (source: LiveTV FOX 1280x720 at 59.94 
 > > fps). The on-screen frame rate fluctuation was particularly apparent 
 > > in the horizontal scrolling bar along the bottom of the screen. This 
 > > is on a quad core Apollo lake system using VAAPI2 decoding with 
 > > AVSync2 enabled with all four cores are staying below 25% utilization 
 > > in Playback Data.  As an experiment, I disabled AVSync2 and found the 
 > > legacy AVSync to be much smoother.
 > >
 > > Has anyone else noticed similar issues with AVSync2 and high motion 
 > > source material like sports?
 > >
 > I wonder if this could have been the LiveTV problem of not catching up 
 > after being started. Try pressing pause for a couple of seconds and then 
 > unpause. There is a bug with Live TV and AVSync2 that was fixed in a 
 > patch yesterday - after that patch you will no longer need to pause and 
 > unpause to get it smooth, although it may take a minute or so to smooth 
 > out after starting play.
 > Let me know if the pause and unpause fixes it.
 > Peter

seems the AVSync2 patch has helped it smooth out after about 10 secs but not as good as AVsync(1) at the start of playback.  I did noticed that patch avsync2 became jerky again after a few minutes of smooth playback however (only seen on one livetv playback - UK BBC2 HD). As you've noted Peter, a quick pause/play seems to resolve it.

More information about the mythtv-users mailing list