[mythtv-users] Hard frontend crash with vaapi on Ubuntu 20.04 and Mythtv 31

[Jim Abernathy]

On 6/1/21 3:38 AM, OpenMedia Support wrote:
> I'm running an Intel N3150 based NUC as a dedicated frontend for MythTV
> and it keep getting hard crashes during video playback with VAAPI. Id
> appreciate some guidance on how to best debug the problem.
>
> Hardware - Gigabyte Brix Intel N3150 / 4GB Ram / 120GB SSD
>
> OS - Ubuntu 20.04 LTS - regularly patched
>
> MythTV Backend - on different hardware with DVB-T and DVB-S cards
>
> MythTV Frontend - Lastest version from the PPA -
> http://ppa.launchpad.net/mythbuntu/31/ubuntu
>
> Video playback currently uses a custom VAAPI profile, but the out of the
> box VAAPI profile also has issues. It appears to occur when playing H.264
> based content. Our DVB-T FTA service is H.264 for both HD and SD material.
> It can occur when we're simply watching a show, and the video / audio
> freezes and I need to hard-reset the Brix hardware.
>
> I've configured for
>   - max_cpus = 3
>   - deinterlacer - low:shader:driver
>   - decoder - vaapi
>   - videorender - opengl-hw
>   - skiploop - 0
>
> I'll try and reproduce with "-v playback" enabled but at present there is
> nothing obvious in the frontend or system logs when the crash occurs.
>
> I'd really appreciate it if anyone else seen similar issues and could
> provide guidance.


I have a NUC i7-1165G7 and it has Iris graphics.  I can't get VAAPI to 
work at all. I have to use OpenGL low quality deinterlacing. When I use 
VAAPI it crashes with code 139. I can't run higher than low 
deinterlacing because the pictures tears about 10% from the top of the 
screen.

Luckily, I didn't buy the $800 NUC as a mythtv frontend only. Iris GFX 
and Mythtv aren't a good solution for sure.

Jim A