[vdr] What is H264 Spatial Direct Mode?

[Morfsta]

Hi,

I see a lot of channels that are not supported in VDR because of
unsupported spatial direct mode in FFMPEG.

This has probably been covered before (mostly in German!) but Reinhard
could you explain what is spatial direct mode and why is it currently
not covered in FFMPEG. Is it quite complex to code up? Do you know if
there are any plans to support it?

Thanks