[mythtv-users] Ubuntu-mate on Raspberry pi and mythtv library problems

[Joseph Fry]

>
> Why is Kodi able to play everything without any issues, and Myth can't
> under the same conditions?  Just curious.
>
>
I will quote Lawrence Rust (who was largely responsible for getting myth
support on the Pi)

>From 12/1/15 thread titled Mythtv Raspberry Pi2 frontend testers:

I believe Kodi borrowed from omxplayer which uses a single OpenMAX pipeline
from decoder to video renderer which shares buffers and avoids copying.
Myth currently requires the separation of the decoder from the renderer and
so causes two video buffer copies - one each for the GPU and CPU.  For a
1920x1080 frame this is a significant burden that causes memory contention.

I will investigate ways of integrating the decoder and renderer so that
they use a single OpenMAX pipeline.  Unfortunately this is not trivial
because of the current assumption that ffmpeg is the only provider of
hardware accelerated decoding i.e. VDPAU, VAAPI, DXVA2 etc.
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