Such a shame that from what I’ve read the BritBox UI isn’t very good and no
. I must get around to trying it...
Tiny detail - but very few streaming services (the only one I can think of is one of the early, now deprecated, iPlayer-on-DVB implementations) use 50i (aka i25) for streaming. Sky's download service uses it, but the dominant streaming services that offer 50Hz fluid motion (iPlayer, Amazon Prime Video, ZDF and ARD in Germany etc.) use 50p (aka p50). This is because a lot of platforms have very poor support for full-motion deinterlacing (and it often requires more power). Android platforms in particular have very patchy support for replay of interlaced content with on-the-fly deinterlacing to 2x frame rate (which is required for full motion)
Deinterlacing 50i (aka i25) sources to 50p (aka p50) rather than to 25p (aka p25) at source, prior to streaming, makes sense in this scenario (as you remove the requirement for the receiving/displaying platform to have to deinterlace)
The one caveat to this is that 1080p50 h.264 is a higher level/profile than is required for 720p50 and 1080i25 DVB broadcasts, so deinterlacing 1080i25 to 720p50 makes some sense in compatibility terms.
Sky can use 50i (aka i25) for their Sky HD download platform as it only operates on a platform that they 100% control, and that has guaranteed interlaced decoding and output functionality (and will be connected to a display capable of deinterlacing).
(What does Sky Q do when streaming hard drive recordings made off-air to tablets and phones over local WiFi - does it deinterlace to p25 or p50?)
Last edited by noggin on 6 March 2020 11:51am - 2 times in total