[noggin]

I'm still unsure of the term you use "Native Interlaced content" ?

Ah - we've discussed it quite a few times. Thought you were across it.

In 50Hz regions we acquire/shoot content at two image rates. 25Hz and 50Hz. Drama, Movies etc. are shot / transferred at 25Hz. Sport, News, Entertainment are shot at 50Hz. 50Hz content has twice the motion or 'temporal' resolution - and thus look more 'fluid' with 'smoother motion' - than 25Hz content.

However in many 50Hz regions 576i/1080i is used for broadcast - which will mean that the content is sent interlaced.

* 25Hz stuff is split into two fields of a 50Hz interlaced frame (both fields of the frame contain content captured in ONE 25Hz images and at the same moment in time - so they are still 'native progressive').

* 50Hz stuff is sent as a single field in a 50Hz interlaced frame. So the two fields in the 50Hz interlaced frame are made up from TWO different 50Hz images. They are captured 1/50th of a second apart. This means that the two fields in the interlaced frame are NOT co-incident, and there is motion between them. This is 'native interlaced'.

To deinterlace 25Hz content in a 50i signal (i.e. native progressive) you just weave the two fields together, i.e. display both fields simultaneously (and twice if you want a 50p output)
To deinterlace 50Hz contain in a 50Hz signal (i.e. native interlaced) you have to do a LOT of processing to deliver a good quality result. (Or Bob - which is effectively just line-doubling each 50i field to create a 50p frame)

So drama, movies and a lot of documentary is shot 25p - so is pointless to look at for deinterlacing performance (as effectively there is no deinterlacing to do on 2:2 content - you just weave - which is a default display case)
Sport, Entertainment and most News is shot 50i - and that is what you look at for deinterlacing performance.

All 25/50fps mpeg2/H264 Live/Recorded Broadcast TV I view is great on AMLogic platforms, very nice on the Core. No issues in any resolution or combo.

25fps mpeg2 VOB content found in Movie DVD iso Rips plays fine on the Core using ff-mpeg2 Software decoding (patched Koying sourced commit HERE) and permanently selecting and setting deinterlacing OFF. As I believe you told me there is no Motion between frames for that type of content anyway so no deinterlacing needed.

Yes - this is native progressive content - so effectively doesn't require complex deinterlacing.

The question is what happens with native interlaced DVD content - like music concerts, classic 'studio shot' TV shows like Monty Python, Doctor Who (1960s-1980s) etc. (which were shot interlaced in the studio on video cameras, and progressive on location on film cameras)