[mythtv-users] Choppy playback on mac mini 2010

Paul Gardiner lists at glidos.net
Sat Oct 28 15:00:37 UTC 2017

On 22/10/2017 19:05, jrh wrote:
>> On Oct 22, 2017, at 12:14 PM, Paul Gardiner <lists at glidos.net> wrote:
>> For some years now, I've had good results from MythTV, using vdpau on devices with nvidia gpus. I've just been trying to get a frontend up and running on a 2010 Mac Mini that has a GT 320M and the results so far have been disappointing. 1080i50 content is very choppy - not at all smooth like I have seen previously from ZBoxes I have owned. I'm using the same disc image on both Mac Mini and ZBox, served via AOE and PXE booting. I'm not seeing anything obviously wrong in the logs.
>> Does anybody have any suggestions what I might look for as the cause of the problems?
>> Cheers,
>> 	Paul.
> Not sure of your configuration, but I am using a 2010mac mini as well with lubuntu 16.04 installed and myth.28.
> I am using vdpau and the nvidia drivers and 1080i60 works fine here.

I've experimented a little more and it turns out that all my archived 
material plays perfectly, and that isn't because it has a lower 
resolution or is progressive. A lot of my archived videos maintain the 
interlace and resolution. The videos may have a slightly lower bit rate 
and may avoid some of the more complicated x264 features. So it's UK 
broadcast material that the Mac Mini struggles with.

Also I can get smooth video playback of the broadcast material by 
setting the audio device to NULL, albeit silent of course.

Also works is setting the playback profile to Vdpau Slim, so whatever it 
finds difficult in the broadcast streams, it can handle providing it 
doesn't also have to use the advanced or temporal deinterlacers. Bob x2 
looks better than I'd expected, but that's halving the vertical 
resolution, right?!

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