[mythtv-users] Playback On Intel

[Warpme]

On 15/05/14 01:19, Jean-Yves Avenard wrote:
> On 12 May 2014 01:10, David Edwards <david at more.fool.me.uk> wrote:
>
>> Unfortunately, I'm having all sorts of issues with playback quality.
>> I've tried the High Quality, OpenGL High Quality and VAAPI Normal
>> playback profiles, but they all have different problems.
>>
>> Decoding - Using High Quality and OpenGL High Quality I get problems
>> in dark areas of the picture. A pale cloud of decoding artefacts
>> slowly builds in shadow areas over a few seconds, then abruptly drops
>> back to black. This repeats every 10 seconds or so. This does not
>> happen when using VAAPI to decode.
> I had this a while back with some nvidia drivers, and it's a known
> issue with the OpenGL deinterlacer.
>
> You should try the OpenGL Normal which uses the KERNEL 2X HW
> deinterlacer. I actually had the best results with that deinterlacer,
> and it takes far less CPU usage....
>
> Another deinterlacer you could try is Yadif 2X HW; it's *very* GPU
> intensive and didn't work with most video cards I tried, but that was
> several years ago, may be worth trying again
>
>> Judder - On SD MPEG-2 broadcasts there is a noticeable judder every
>> second or so, particularly on horizontal pans. On HD H.264 broadcasts
>> the judder is there, but less noticeable. I am in the UK, so these are
>> 25fps interfaced. On ripped DVDs (deinterlaced with Handbrake where
>> applicable) at 25fps and Blurays at 23.976 fps playback is generally
>> smooth, but there is an occasional jump. This happens on all playback
>> profiles. The refresh rate on the TV appears to be correctly switching
>> based on the content.
> sounds like sync-to-vblank isn't enabled...
>
>> 3. Motion Adaptive deinterlacing was added to the Intel graphics stack
>> in 2013Q2 (see https://01.org/linuxgraphics/downloads/2013/2013q2-intel-graphics-stack-release),
>> but does not appear as an option in the playback profile settings
>> 4. Refresh rate switching doesn't select non-integer rates even though
>> they can be selected manually using "xrandr" from the command line.
> yes, it's only in very recent version of XRANDR API that those are
> supported, and myth only supports Xrandr 1.2 API (and the NV-CONTROL
> extension which lets do the same thing)
>
> problem not that long ago, many graphic drivers only support xrandr
> 1.2, API drivers for a start...
>
> Ill look into Motion Adaptative, just got a new haswell laptop got me
> something to test, and I too have been looking at a cheap, low-power
> frontend solution. Those tiny intel fits the bill
>
> In the mean time, try using plain ffmpeg, openGL and kernel 2X HW...
>
> won't be as good as nvidia vdpau (nothing is), but it's close
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All,
Just quick Q regarding playback on Intel VAAPI: did anybody uses 
separate Video/GUI modes with Intel HW?
Mine NUC53427 - if separate Video/GUI modes is enabled - has all content 
video playback shifted down vertically approx 200px.
GUI is OK. Only video playback is shifted.
Issue is only on 1080p TV (I checked on 2 TVs).
On 1280x1024 LCD monitor all is OK.
br

BTW: I fully agree with JYA: today still nothing is even close to nvidia 
regarding video playback...