Greg G. wrote:
Andy,
On 25.04.2012 19:51, Andy Furniss wrote:
Some random thoughts/tests/questions in no particular order non of which
may help (maybe if you are using cpufreq try that first with myth).
thanks for your feedback.
If your desktop is using compositing try to disable it if you can.
Had already tought of that.
Can you reproduce with mplayer, with this -
Never thought about trying that. Funny enough, with mplayer, both xv and
gl juddered. Perhaps it's due to mplayer running with normal prio, I may
try again with "nice".
If you are running a 60Hz screen of course it's never going to be smooth
Yes, of course. Fortunately myth will choose a suitable screen mode, and
I verified it works. Again - with Xv it's just fine.
On my box the gl won't be smooth unless I set my cpus to perf (and the
I was not able to see any difference between ondemand and performance,
except that the system got hotter quicker. But your hint reminded me
that I'm using cpupowerd to undervolt my CPU and that it therefore uses
the userspace governor. I had somehow completely forgotten about that
:-) But anyway that didn't change a thing either.
What is your cpu and what res is the screen, are you using more than one
screen?
Athlon X2 5000, 1080p, single screen on HDMI.
Does myth use vdpau if so does it allow software decode but still use
vdpau as you would gl or xv - I mean just csc and scaling rather than
full accelerated decode?
Still need to check this.
list CC added, so others can see.
Ok, I am not sure what's going on then.
Maybe, as Michel suggested vblank is involved.
Can you repeat the mplayer test like this -
vblank_mode=0 mplayer ...
This should over-ride the dri vsync.
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