Originally Posted by VinnyS
Your right, HEVC or H.265 has been in works for some time now, but I simply do not believe in the claims they are currently making with the current bitrate. They are claiming they can stream 4K video at 10Mb when H264 Bu-ray is 20-30Mb.
But are they saying they can deliver streamed 4K at a Blu-ray equivalent quality - or something nearer broadcast TV quality. UK H264 OTA on DVB-T is averaging around 7.5Mbs for a 1080i channel - though as it is statmuxed channels can peak at 17.5Mbs (and often sports content sits at around 10Mbs) IP streamed 1080p content is typically around 5Mbs (sometimes lower).
If you wanted to compare 1080p Netflix (c.5Mbs?) with an equivalent 4k IP streaming service - then with H264 you'd expect to need 4 x 1080p streams = 20Mbs. Isn't HEVC supposed to compress quite a lot better than H264 does - so halving the data rate required to 10Mbs doesn't sound that unrealistic does it?
I agree that 4k at Blu-ray compression quality (i.e. almost no visible artefacts) looks a bit optimistic at 10Mbs - but it may be that they are quoting 10Mbs as a bitrate for a 4k service aimed at those more tolerant to compression artefacts (as Netflix etc. viewers probably are?)
I guess seeing is believing and we'll have to see it for ourselves in the future. Second point is that we don't even get 1080p at this moment with out cable providers, only a select few offer it such as DirectTV and some others I may not be aware of. Even though a potential codec has surfaced, I still think we are a LONG way from watching 4K, little alone 4K broadcast.
I don't see 1080/60p (or 50p) taking off - and didn't really ever see it doing so. The difference in quality compared to 1080/60i or 50i are marginal to most viewers I suspect. The vast majority of 1080p content is 1080/24p (or 1080/25p in Europe) - which survives in a 1080i wrapper - so there's no real benefit to 1080p encoding (though this side of the pond the BBC are running encoders which switch between 1080/25p and 1080/50i compression on the fly on a GOP-by-GOP - I think - as 1080p content compresses better in a 1080p flagged encode?)
I think 4K may arrive quite soon. Displays are beginning to appear, and IP download delivery is definitely a viable model (the VOD/Catch-Up system on our dominant pay-TV platform, Sky, uses IP download rather than streaming, and the quality is much better as a result. Usually around 8Mbs 1080i H264. )