[wrxtasy]

Hi, it is IPTV service. I am not sure if it is the same thing as deinterlacing, but when the Movistar F1 Channel shows old F1 footage(Mpeg2?), The Mi Box S looks bad. The Fire TV looks better.

You will find the decent Sports oriented IPTV providers stream video in a Progressively encoded video format. And for sports that needs to be 50 or 60 fps for fluid motion.
All media player platforms should not have a problem playing back, nornmal Progressive video so long as the media player output Hz corresponds with the Frame per second of the streamed video.
In reality auto Frame Rate Matching needs to be working for user convenience here.

The Fire TV's and many other Android media players come unstuck with Broadcast ATSC or DVB Interlaced content. Their Hardware deinterlacers are either not up to the job or there are issues with the underlying EXOplayer and Mediacodec decoding.

In fact if Free to Air - Broadcast TV (NOT IPTV) - Interlaced streamed video playback works properly at all on Android media players consider it a bonus. In general they should be avoided all together for that sort of TV viewing.