Bug#857552: i965-va-driver: failing to play videos (stops half-way through)

[Nicholas D Steeves]

On Wed, Mar 15, 2017 at 10:50:54AM +0100, Sebastian Ramacher wrote:
> Hi
> 
> On 2017-03-13 07:13:09, Luke Kenneth Casson Leighton wrote:
> > On Sun, Mar 12, 2017 at 7:01 PM, Sebastian Ramacher
> > <sramacher at debian.org> wrote:
> > > Control: tags -1 + moreinfo
> > >
> > > On 2017-03-12 13:31:24, lkcl wrote:
> > >> Package: i965-va-driver
> > >> Severity: important
> > >> Tags: upstream
> > >>
> > >> i'm getting a video stopping half-way through with the following errors
> > >> (reported under vlc):
> > > ...
> > >> [00007f16c0d62ff8] avcodec decoder: Using Intel i965 driver for Intel(R) Skylake - 1.7.3 for hardware decoding.
> > >> [00007f16c0c01978] mkv demux error: Dummy Element at unexpected position... corrupted file?
> > >> [00007f16c0c01978] mkv demux error: Dummy element too large or misplaced at 770798513... skipping to next upper element
> > >> [00007f16c0c01978] mkv demux error: Dummy Element at unexpected position... corrupted file?
> > >> [00007f16c0c01978] mkv demux error: Dummy element too large or misplaced at 772666289... skipping to next upper element
> > >> [00007f16c0c01978] mkv demux error: Dummy Element at unexpected position... corrupted file?
> > >> [00007f16c0c01978] mkv demux error: Dummy element too large or misplaced at 774009777... skipping to next upper element
> > >> [00007f16c0c01978] mkv demux error: This element is outside its known parent... upping level
> > >> [h264 @ 0x7f16c0c3f460] co located POCs unavailable
> > >> [h264 @ 0x7f16c0c30420] co located POCs unavailable
> > >> [h264 @ 0x7f16c0c3f460] co located POCs unavailable
> > >> [h264 @ 0x7f16c0c30420] co located POCs unavailable
> > >> [h264 @ 0x7f16c0c30420] co located POCs unavailable
> > >
> > > Or is that a problem with the file?
>
> > > Does the issue happen with every file or only that one?
> > 
> >  on occasion, several files (not all), but it's repeatable and at the
> > exact same place if it occurs.  so for example let's say that vlc
> > stops with the above error at 1m30s into the file, it's going to
> > happen *exactly* at that point *every* time *specifically* for that
> > file and that file only.
> > 
> > > Does it happen with any
> > > other video player (or when disabling hardware acceleration)?
> > 
> >  hmmm good points, i'll find out.  of course i'll have to set up hw
> > accel for other players... resource-hogging might make playback
> > difficult without hwaccel.... these are 720p files, quite
> > resource-intensive: just have to see how it goes.

Hi,

MPV can be very quickly set up to test this.  If you've installed MPV from testing:

mpv --hwdec=vaapi --vo=opengl

If performance isn't good enough, try

mpv --hwdec=vaapi --vo=vaapi

If you like MPV, you can configure it permanently here: ~/.config/mpv/mpv.conf

Add the lines:

hwdec=vaapi
vo=opengl or vo=vaapi, depending on which worked for you

I noticed something strange in the original bug report:

> > > On 2017-03-12 13:31:24, lkcl wrote:
> > >> Package: i965-va-driver
> > >> Severity: important
> > >> Tags: upstream
> > >> 
> > >> -- System Information:
> > >> Debian Release: 7.4
> > >>   APT prefers testing
> > >>   APT policy: (500, 'testing'), (500, 'stable')
> > >> Architecture: amd64 (x86_64)
> > >> Foreign Architectures: i386

Debian Release: 7.4 with i965-va-driver and kernel from Debian 9?

Luke, I think your base-files needs to be upgraded ;-) Out of
curiousity, does (as root) "echo n | apt-get dist-upgrade" want to
upgrade anything?

Cheers,
Nicholas
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