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

[Sebastian Ramacher]

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?
> 
>  yes... but it certainly shouldn't just bomb-out like that (it's not a
> corrupted file from being downloaded, it's a correctly-downloaded
> confirmed uncorrupted download)

Yes, but that still leaves the possibilites that the mkv files were created with
a buggy muxer or vlc's mkv demuxer fails on them.

Could you share the affected files?

> > 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.

Please do.

Cheers
-- 
Sebastian Ramacher
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