[mythtv-users] HD playback problem w/ kernel version

[John Pilkington]

On 11/02/2019 20:56, Mark Brown wrote:
> Hey, sorry for the delay in responding.  I booted my fc29 front end to 
> kernel 4.20.6-200 and hd playback was still severely choppy.  I verified 
> that mythfrontend is indeed using vaapi (m > playback > playback data), 
> but playback still suffers.  Changed vid scan to progressive as you 
> suggested, and it improved playback some, but still to choppy to live 
> with.  Rebooted fc 29 front end to kernel 4.18.16-300, and all is well 
> again, all playback is smooth and works fine.  For me the problem began 
> late in fc28 when the first kernel 4.19 came on the scene.  I upgraded 
> the front end to fc29, but that again only works great when its using 
> the 4.18 series kernel.  Id be interested in what you see if you put the 
> 4.18 kernel on your fresh fc29 laptop and see if your playback is 
> improved...
> 
> Thanks,
> -M

I tried google with 'vaapi kernel 4.20 bugzilla' and first hit was

  https://bugzilla.kernel.org/show_bug.cgi?id=109051

which appears to have been festering since 2005 and is now at comment 
987.  Many comments are long.  Baytrail, probably not the N2380...

John P
> 
> On Sat, Feb 9, 2019 at 7:48 AM Tim Draper <veehexx at zoho.com 
> <mailto:veehexx at zoho.com>> wrote:
> 
> 
> 
> 
>       ---- On Tue, 05 Feb 2019 13:56:26 +0000 Mark Brown
>     <mbrown at wheelgroup.org <mailto:mbrown at wheelgroup.org>> wrote ----
>       > Hello all,
>       > Been having HD playback problems with a Fedora 28/29 frontend
>     since kernel 4.19.  The problem exists with HD TV (hdhr) or HD video
>     playback.
>       > Frontend version is 29.1-25 and is on an intel nuc, i915 video
>     chipset, hdmi out, 'Option "AccelMethod" "sna"' is set, "VAAPI 
>     normal" enabled in mythfrontend.
>       > System works fantastic with kernel versions up to 4.18.16-300
>     but anything later in the 4.19/4.20 series and HD playback stutters
>     terribly (audio and video).
>       > Anyone seeing similar or have a pointer of where to look?
>       > Thanks! -mark _______________________________________________
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>       >
>     you might be onto something here. i too have been having issues.
>     when in a HD recording, try menu > video > advanced > video scan >
>     manually set 'Progressive'. and see if that improves things.
> 
>     just tried it on my recently rebuilt FC29 laptop - out of box works
>     fine. aside from the fact vaapi isnt enabled on FC29 iso, you have
>     to manually install the libva-intel-drivers (and libva-tools why
>     not; 'sudo vainfo' to confirm operation) enable the VAAPI decoder in
>     mythtv video playback settings and things go wrong.
> 
>     also had it on primary FE (see thread 'v30 unsmooth playback'
>     recently) and a reinstall seems to have fixed it. turns out it could
>     be i dont have the vaapi drivers installed on it.
>