[mythtv-users] v30 unsmooth playback

Stuart Auchterlonie stuarta at squashedfrog.net
Mon Feb 11 11:53:42 UTC 2019

On 04/02/2019 20:33, Tim Draper wrote:
>  ---- On Sun, 03 Feb 2019 19:54:55 +0000 John Pilkington <johnpilk222 at gmail.com> wrote ---- 
>  > I don't know what capabilities your NUC has.  My SL7.6 +  
>  > elrepo-4.4-kernel box, running Master, is currently playing an HD DVB-T2  
>  > recording, getting it as a video from NAS.  Playback is mainly good but  
>  > jerky on panning.  Video is old intel without hardware acceleration,  
>  > Normal setting.  CPU is 2.8 GHz core2duo and display is VGA in a  
>  > 1024x576 window; 2 cores at 90% or above. 
>  >  
>  > If I want to watch output from this box at full resolution I use DLNA. 
>  >  
>  > Have you investigated the 'Advanced Playback Settings,' which were added  
>  > quite recently with the aim, IIRC, of getting smoother playback and  
>  > using VAAPI2? 
>  >  
>  > --------------- 
>  >  
>  > Another thought:  I found out only a few weeks ago that the VDPAU  
>  > settings included "number of processors."   Perhaps for VAAPI too? 
>  >  
> The nuc is a 2014 model; Intel HD graphics. tends to run about 35% on vaapi 1080p content.
> Tried the vaapi2 option and it can't handle it. same 1080i recording runs fine with vaapi&manually set progressive scan, but doubles CPU time and just cant handle it smoothly.
> Based off the quietness of this thread, sounds like its not a wide spread issue. wonder if somethings become broke with the many repo updates i needed. Unless we can find a solution before, i'm going to plan a reinstall at the weekend.

Is it definitely using vaapi / vaapi2?

I see from another post you recently rebuilt to f29, which uses wayland
by default, and unless you specifically configure the dri devices for
vaapi2, the vaapi subsystem will fail to initialize and you will drop
back to software decoding.

Pop up the playback data window to check
Hit 'M' > playback > playback data

and you should see vaapi/vaapi2 in there, if you see ffmpeg you are
running with software decode.


More information about the mythtv-users mailing list