[mythtv-users] nouveau video faster than audio

[HP-mini]

On Wed, 2014-01-01 at 20:45 +1100, Eyal Lebedinsky wrote:
> On 01/01/14 20:00, Nick Rout wrote:
> > On Wed, Jan 1, 2014 at 9:22 PM, Eyal Lebedinsky <eyal at eyal.emu.id.au> wrote:
> >> On 01/01/14 18:55, Nick Rout wrote:

> >>>>
> >>>> Sorry, just a finger slip, it is 0.26.1-4.
> >>>
> >>> Try the nvidia driver, not sure why you'd use nouveau on a multimedia box.

> >> It is my understanding that it should be usable these days, and it is just
> >> fine
> >> otherwise.
> >>
> >> I should add that with mplayer or vlc the same files play perfectly. Only
> >> mythtv
> >> FE has this problem.
> >
> > where are you playing the audio to? HDMI? analogue?
> 
> Nothing this fancy. Audio taken from the PC headset socket to the shelf speakers.
> FE says Audio output device: ALSA:pulse
> 
> >>> If the video is made at 25fps it should be played back at 25 fps,
> >>> adjust your settings so that the refresh rate is switched to the rate
> >>> the video is supposed to be played at.
> >>>
> >>>> On 01/01/14 16:50, Nick Rout wrote:
> >>>>>
> >>>>>
> >>>>> On Wed, Jan 1, 2014 at 6:28 PM, Eyal Lebedinsky <eyal at eyal.emu.id.au>
> >>>>> wrote:
> >>>>>>
> >>>>>>
> >>>>>> Earlier this year I reported an issue which I never resolved (I stopped
> >>>>>> using the FE
> >>>>>> on this machine).
> >>>>>>
> >>>>>> The problem is that the audio plays normally but the video is faster so
> >>>>>> the
> >>>>>> two get out
> >>>>>> of sync quickly (and the difference grows very large). Any skip fwd/bwd
> >>>>>> resyncs the two
> >>>>>> which then start diverging again.
> >>>>>>
> >>>>>> I want to get back to it and find a solution. Maybe adding more details
> >>>>>> will
> >>>>>> bring up a solution?
> >>>>>>
> >>>>>> - f19 kept up to date
> >>>>>> - mythtv-*-0.20.1-4.fc19
> >>>>>
> >>>>>
> >>>>>> - X video driver: xorg-x11-drv-nouveaux.86_64 version 1:1.0.9-1.fc19
> >>>>>>      -rwxr-xr-x 1 root root 207000 Jul 30 16:08
> >>>>>> /usr/lib64/xorg/modules/drivers/nouveau_drv.so
> >>>>>>
> >>>>>> Looking at an example nuv file:
> >>>>>>            MythTV NuppelVideo v0.07
> >>>>>> (720x576),progressive,aspect:1.78,fps:25.00
> >>>>>> Then at "Playback data" I see
> >>>>>>            Video: 720x576 at 25.00fps    FPS: 29:96+-0.00
> >>>>>> This mean that the source material is 25fps (as is FTA in Australia)
> >>>>>> but the playback is 30Hz (too fast). The display mode is 2560x1440 at 60.0Hz (there is no
> >>>>>> 50Hz mode).
> >>>>>>
> >>>>>> How do I tell Myth (or X or whoever) that the video should be adjusted
> >>>>>> to 30fps (or 60)?
> >>>>>>
What video playback method are you using: vdpau, openGL or Xv ?

The nouveau driver does support VDPAU but requires firmware.
http://nouveau.freedesktop.org/wiki/VideoAcceleration/
But try the nvidia driver (as Nick suggested).

MythTV (0.25 on) does not playback mismatched video-refresh rate video
very well..
ticket#11246

I have never observed AV sync drift with nvidia driver just jitter.

It is likely your display will accept 2560x1440p50. But if the display
EDID does not advertise this mode you would have to override.
The nVidia Xorg driver has a rich set of configuration options to allow
that type of control.