Re: Concerning IPTV
HEVC is simply more efficient than H264, which was more efficient than MPEG2 .. and so on.
There are not 4x as many pixels unless you are dealing with a stream that has 4x as many pixels!!!
SD in MPEG2 is 4 Gigs of data. 2 hour movie
SD in H264 is 1.5 Gigs for the same quality.
SD in HEVC is 0.8 Gigs for the same quality.
The transmission rates for HEVC broadcast will save a lot of bandwidth, as would transmitting current MPEG2 SD streams in H264.
So getting HEVC (H265) into a new 'FreeviewSHD' box, and changing all transmissions to H265 would provide plenty of scope for more crap SD channels, or a few 4k channels on top of what there now due to the compression savings across everything else.
HEVC is needed to cope with 4k pixels because data streams would be huge under H264, using up valuable bandwidth.