[mythtv-users] Fwd: Re: specific channel seek issue and acts like poor signal

[John]

On 15/04/2019 21:04, Tim Draper wrote:
> ---- On Sun, 14 Apr 2019 18:20:55 +0100 Stephen Worthington 
> <stephen_agent at jsw.gen.nz> wrote ----
>
> > One obvious difference between those two channels is that, while they
> > are both interlaced, the non-working one is bottom field first, and
> > the working one is top field first.
>
> good find. wouldn't of even thought about looking at the way the 
> channel was rendering.
> i took a look at playback profiles last night so see if that could 
> help, but there doesn't appear to be a way to change profile based on 
> channel or something useful specifically to target this issue. My 
> primary FE is a 3-4yr old celeron so doesn't do too well with some HD 
> content so would prefer to keep vaapi enabled if at all possible.
>
> What would be the proper long term fix - is this a bug or a config issue?
>
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You could use Opengl playback for SD and VAAPI2 for HD. In MythTV 30 
there is a setting in Video > Playback.

(Setup->Video->Playback->Current Video Playback Profile->(right arrow)) 
which allows different playback profiles to match the stream being played.

I now use OpenGL high quality for everything. The CPU load in MythTV 30 
(for HD) is less than 20% (per core) on a cheap celeron of the same age 
as yours. FFmpeg has presumably been well optimised.  Check that the 
number of process cores(Setup->Video->Playback->Current Video Playback 
Profile->entry) Max CPUs is set to 4. I use both Freesat and Freeview 
and find software playback is more robust across the two. The picture 
quality is the same as VDPAU.