[mythtv] V4L2_PIX_FMT_NV12M for amlogic hw decode support?

[Piotr Oniszczuk]

Mark,
pls see inline

> Wiadomość napisana przez Mark Kendall <mark.kendall at gmail.com> w dniu 17.08.2019, o godz. 02:42:
> 
> Hi Piotr.
> 
> Currently on my summer travels - won’t be back for another 2 weeks or so.
> 
> In the meantime:
> 
> Re yv12 playback- have there been fixes to the Lima driver? Curious why you can only play some videos.

I suspect issue might be related to:
1. Different shaders configuration (isn’t that mpeg2 playback uses different DI shaders?)
2. mesa-lima still has bug for recordings with subtitles/CC (where also text is needed to be rendered) 
 
> 
> Re NV12M - change looks fine. Though I wonder if the ffmpeg code will handle that enum?

I don’t see any errors at compile nor runtime. Is it means that NV12M already has such enum?
mythffmpeg plays ok test videos with amlogic m2m vdec 

> 
> Re playback errors - try removing the call to 
> MythV4L2M2MContext::SetDecoderOptions - that’s the only reason I can think of for that error.
> 

Unfortunately this not helps. Error is the same :-(

 
> Regards 
> Mark
> 
> 
> On Fri, 16 Aug 2019 at 13:26, Piotr Oniszczuk <piotr.oniszczuk at gmail.com> wrote:
> Mark,
> 
> Just small progress report regarding myth on some arm systems.
> 
> Fixing issue with playback black screen on arm mali gpu is progressing well :-)
> I can now play some videos with yv12 renderer on mali. 
> 
> It looks however that amlogic hw decoder uses multiplanar nv12 pix fmt. (nv12m). 
> By this I add V4L2_PIX_FMT_NV12M in checks at mythtv/libs/libmythtv/mythv4l2m2mcontext.cpp#L262
> Unfortunately any attempt to play content with v4l2 m2m decode on s905 v4l2 gives error like in log: https://pastebin.com/FnYrNvn7
> 
> Let me know what You think!
> 
> 
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