[mythtv] Redone FFmpeg 4.4.1

[Piotr Oniszczuk]

> Wiadomość napisana przez Ian Campbell <ijc at hellion.org.uk> w dniu 02.12.2021, o godz. 22:50:
> 
> On Thu, 2021-12-02 at 18:58 +0100, Klaas de Waal wrote:
>> A better strategy is to contribute new features to FFmpeg and then to
>> make use of these features in MythTV.
> 
> One possible compromise approach might be to insist that there has at
> least been a reasonable initial submission of the patches to ffmpeg
> upstream which hasn't received a hard "no way we will ever take this" -

kernel side:
kernel uAPI example: https://lkml.org/lkml/2020/11/12/487
it is required as ffmpeg is conusmer & will never - even look - at code using private kernel API.
So far public are: mpg2, h264, vp8. very soon will be vp9 & hevc  

ffmpeg side:
h264 example https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=2898
Jonas is currently much less active (covid or new work?)

v4l2_request hw decode is official committed long-tern strategy for linux kernel hw.accell access on embedded/SoC ecosystem.
so - from future point of view - it is rather question of _when?_ ffmpeg will officially support it - not question of _will support?_

Guys,

I see there is mood not going with v4l2_request code at the moment.

No problem - we can hold this now and see in future.... 
  
br