[mythtv-users] Problems with VAAPI playback

[Geoff B]

Hi all,
I'm running 0.25-fixes on Mythbuntu 12.04 x64, and am using an Ivy Bridge
(3750K) CPU in an attempt to get VAAPI playback.

Right now, when I play back a recording with VAAPI (no deinterlacing set)
the frontend gives me the usual black screen with "Please wait...", but
instead of the recording starting I get about a half-second of audio; the
screen goes black, then back to the 'Please wait' screen - and this repeats
4-5 times. After that, the machine freezes completely, and I have to
hard-boot it.  If I'm lucky, I can press escape during the "Please wait"
cycle and get back to the Myth menus.

vainfo returns:

libva: VA-API version 0.32.0
libva: va_getDriverName() returns 0
libva: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva: va_openDriver() returns 0
vainfo: VA-API version: 0.32 (libva 1.0.15)
vainfo: Driver version: Intel i965 driver - 1.0.15
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            :    VAEntrypointVLD
      VAProfileMPEG2Main              :    VAEntrypointVLD
      VAProfileH264Baseline           :    VAEntrypointVLD
      VAProfileH264Baseline           :    VAEntrypointEncSlice
      VAProfileH264Main               :    VAEntrypointVLD
      VAProfileH264Main               :    VAEntrypointEncSlice
      VAProfileH264High               :    VAEntrypointVLD
      VAProfileH264High               :    VAEntrypointEncSlice
      VAProfileVC1Simple              :    VAEntrypointVLD
      VAProfileVC1Main                :    VAEntrypointVLD
      VAProfileVC1Advanced            :    VAEntrypointVLD

I've seen references to environment variables like LIBVA_DRIVERS_PATH but I
don't have these set; do I need these?

I assume the next request is to ask for a backtrace, but from my reading
this requires something to actually crash, right?  From what I can tell,
I'm not getting a crash, I'm getting a freeze (or a recovery back into the
frontend menus).  I'm more than happy to be wrong, and to put whatever
effort needed into debugging.  I ran mythfrontend-real > mythdebug.log,
contents of which are here:
http://pastebin.com/T44DhReU

(thiis is from one of the times I managed to recover with the escape key)

In case it helps, there were several lines which 'escaped' into the
terminal window:

QFont::setPixelSize: Pixel size <= 0 (0)
QFont::setPixelSize: Pixel size <= 0 (0)
QFont::setPixelSize: Pixel size <= 0 (0)
QFont::setPixelSize: Pixel size <= 0 (0)
libva: VA-API version 0.32.0
libva: va_getDriverName() returns 0
libva: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva: va_openDriver() returns 0
libva: VA-API version 0.32.0
libva: va_getDriverName() returns 0
libva: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva: va_openDriver() returns 0

Note that OpenGL works fine, albeit with 50%-70% CPU usage.  Videos work
fine too - it's just recordings that fail.
Any help greatly appreciated!

Cheers,
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.mythtv.org/pipermail/mythtv-users/attachments/20120516/61a6220c/attachment.html>