Finally got round to watching some football on Now TV this afternoon. First time I've watched a match of any form of IPTV that looks as good as watching on linear tv.
Now (no pun intended) if they can increase the fps to 50 for all sports channels, NOW TV would be a credible alternative to spending a shed load on Sky or Virgin.
I wonder what bitrate they are using for 1080p50 streams. If they are h.264 I'd hope it was North of 10Mbs. iPlayer falls apart on some taxing stuff at 720p50 5.3Mbs, and has a lot less information to carry.
1080p50 = 104M/"pixels" per second source
720p50 = 46M/"pixels" per second source
It's not a linear relationship between pixels per second and bitrate - but it shows you the additional challenge.
"pixels" = 8-bit luminance sample sites (plus 1/4 of Cr and Cb chroma samples - as each Cr and Cb sample covers 4 luminance samples) (So for 4:2:0 8-bit h.264 you can think of the format as 12-bits per pixel. 4 x 8 bit Y samples and 1 x 8 bit Cr and 1 x 8 bit Cb per 2x2 sample grid)
Amazon Prime Video is using 11-12Mbs h.264 for their Tennis 1080p50 streaming according to my Apple TV 4K developer HUD. (128k AAC audio)
Last edited by noggin on 28 November 2019 12:47pm - 2 times in total