[noggin]

Deinterlacing only makes sense whenever you play interlaced content. Never ever set Deinterlacing to On - always keep it on Auto. As you are running a Baytrail ... it is not fast enough to support VPP-MADI in all cases - you should use VAAPI-BOB.

Exceptions can prove rules :-)

There may be times like mixed content (UK HD TV) when forcing on + MADI is the best way. I am thinking here of old threads where it was noticed that auto switching according to the stream flags caused a black frame - maybe that is solved?

With MADI in theory at least always on shouldn't hurt progressive as it's MADI so won't blend when not needed.

Yes - the 25p/50i encoder switching in use in the UK on terrestrial HDTV is confusing to many. It's chosen GOP-by-GOP AIUI - and AIUI the choice made by the TX encoder isn't always right...