[mythtv-users] Problem Playing 720p 60fps recordings

[Peter Bennett (cats22)]

On 01/21/2013 09:43 AM, Peter Bennett (cats22) wrote:
> I have one backend/frontend combo, another dedicated frontend, and my
> general purpose desktop computer which also has the frontend installed.
>
> My problem is that on the desktop computer only, if I play a recording
> that came from a channel that broadcasts at 720p 60fps, the video plays
> in slow motion and the audio cuts in and out. The audio is probably just
> trying to stay in sync with the slow motion video. I appears that it may
> be playing the video at 30 fps instead of 60 fps.
>
> Programs recorded at 1080i 30fps play perfectly.
>
> The 720p 60fps recordings play perfectly on the other two frontends.
>
> This happens on mythtv 0.25 and 0.26.
>
> All the systems are running Ubuntu 12.04 and mythtv 0.26.
>
> The backend/frontend is the slowest CPU, 32bit pentium single core hyper
> threading about 7 years old.
> The dedicated frontend has a dual core pentium 64 bit cpu about 5 times
> as fast as the backend/frontend.
> The desktop has Intel i7 quad core with hyper threading, twice as fast
> as the dedicated frontend.
>
> The desktop does not have an NVIDIA adapter and is not set to use VDPAU.
> The other two have nvidia and VDPAU set. The desktop has ATI Radeon HD
> 4350. I used to have an ATI display adapter on the combo
> frontend/backend and I never noticed this issue there.
>
> The 720fps mpg files play perfectly on the desktop machine with VLC and
> the Ubuntu movie player program, just not with Mythtv front end.
>
> I have tried all the playback profiles, with no different results. I
> tried adjusting the time stretch in the playback but that was not the
> cause and I could not get it working correctly by changing that.
>
> I suspect there may be some software I have installed on the desktop
> that is affecting this playback, but I don't know what it could be.
>
> Any ideas?
>
> Peter

I tried installing the AMD display drivers from the AMD site, following
the instructions at
http://askubuntu.com/questions/124292/what-is-the-correct-way-to-install-ati-catalyst-video-drivers-fglrx
This did not fix the slow-motion video, however they messed up the video
aspect ratio, everything was stretched vertically, so I uninstalled
those again.

Anybody have any ideas?

Peter