[mythtv-users] 0.25 VAAPI does it work

[fred watt]

Thanks for the swift feed back Angela :)

NVidia is an option this is easy to to setup with VDPAU - but it means
another card in my frontends for me (a) want to keep as low power as
possible (b) my front ends are tiny iscsi devices in tiny mini-itx cases
(c) VAAPI appears to work - just not in MythTV (d) would like to continue
to use open 'gpu' drivers... but it is an option you're right :)

My loose understanding was the VAAPI offloaded the decode of say h.264 to
the gpu.  So the 'statically linked' version of ffmpeg should not matter.
But I don't carry the detail and your observations about ffmpeg may play a
part.

I do know that with clarkdale there's no hw de interlacing yet - okay I
accept that, but I am not getting that far.  Just 'jerky' recordings which
are 'kind of' watchable but not for long due to the stutter effect.  If I
don't use VAAPI video is fine, as is VAAPI with VLC.  So it isn't the
recordings.

Would be good to hear a success story or two with MythTV and VAAPI.   I've
read everything on the web and I've yet to find anyone talk about having a
fully 'hassle' free and working set up.

If it could be made to work... it would be a dream lowed powered f/e
solution.  I read about other players XBMC, mplayer, vlc etc working with
VAAPI... but yet to clearly understand if mythtv works.

Thanks for your experiences, interesting to read.  Regards, Fred.

On Tue, Aug 7, 2012 at 4:54 PM, Angela <angela.schmid at wolke7.net> wrote:

>
> >As a long time mythtv user I am unable to get VAAPI working. I am able to
> view a mythtv bbc one hd recording in VLC using VAAPI (looks very nice) but
> have never been able to playback the same or any recording using VAAPI in
> >mythfrontend.
>
> >Does VAAPI work?  Has anyone had success?  Does it work at all in 0.25.
> Any one seen it work with 0.26 beta?
>
> Some say it works in 0.25. Haven't seen no information reading the list in
> which setups it works.
>
> I have a SandyBridge and worked with the intel-gfx devs to tackle my VAAPI
> problem with mythtv. Upgraded to the latest DRI, kernels, etc.. Mythtv
> always locked after 0.1 seconds. I moved to nvidia without complains.
>
> https://bugs.freedesktop.org/show_bug.cgi?id=51061
> http://lists.freedesktop.org/archives/intel-gfx/2012-June/thread.html#18335
> Problems about shaking depended highly on the recording, same where seen on
> nvidia and as I later recognized are related to deinterlacing, which should
> be in my case be used, also when playing deinterlaced material on an
> interlaced tv.
>
> More interesting, mplayer worked and is using a specific revision of ffmpeg
> (during compile it checkouts the specific revision). Mythtv uses an older
> version. As far as I can remember 0.8.xxx vs. 0.6.xxx. ffmpeg is compiled
> and statically loaded during linking (not depending on installed packages).
>
> 0.26 does not have updated ffmpeg code and as far as I know no updates to
> fix VAAPI problems are included.
> I hope the mythtv devs will pick up the upgrading of the ffmpeg source for
> 0.27. From reading the list, the upgrades were previously done by a dev
> which does not join mythtv anymore.
> Maybe a dev can comment on upgrading plans.
>
> Cheers
> Angela
>
>
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