[opendtv] Re: 4k @ 60 fps encoded into 15 Mbps using HEVC
- From: Ron Economos <w6rz@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 28 Oct 2012 22:14:59 -0800
Unfortunately, when you de-interlace 1080i@xxxxx, you end
up with 1080p@xxxxx which until very recently could not be
transmitted in MPEG-2 and for which there aren't many
decoders in the field (for any compression format).
1080i is still very popular. On my Comcast cable system
here in Silicon Valley there are currently 111 HD channels.
Of those 111, 85 are 1080i and 26 are 720p. In other
words, 3 out of 4 HD channels are 1080i.
The addition of some optional flags to handle interlaced
video in HEVC is a good compromise. It's just a few
bits and does not interfere with the progressive nature
of HEVC at all. It should be noted that proposals for
real interlace tools (like PAFF) in HEVC are being
rejected at this time. The progressive video camp
certainly got their wish with HEVC.
Ron
For those interested, here's my list of HD channels.
Terrestrial
702 KTVUD = 720p
703 DKNTV = 1080i
704 KRON = 720p
705 KPIXD = 1080i
706 KICUD = 720p
707 KGODT = 720p
709 KQEDH = 1080i
710 KQED+ = 1080i
711 IONHD = 720p
712 KBCWD = 1080i
713 KOFYD = 1080i
714 KDTVD = 1080i
715 LIVWL = 720p
716 KFSFD = 1080i
717 KCSM = 720p
718 KSTSD = 1080i
Cable only
720 CSNBA = 1080i
721 CSNCD = 1080i
723 NBCSP = 1080i
724 ESPND = 720p
725 ES2HD = 720p
726 ESWHD = 720p
727 NBAHD = 1080i
728 NHLHD = 1080i
729 MLBHD = 720p
730 NFLHD = 1080i
731 SPDHD = 720p
732 CBSSD = 1080i
733 BRVOD = 1080i
734 A&EHD = 720p
735 TBSHD = 1080i
736 SYFYD = 1080i
737 TNTHD = 1080i
738 USAHD = 1080i
739 UHD = 1080i
740 TVONE = 1080i
741 FXHD = 720p
742 STYLD = 1080i
743 SPKHD = 1080i
744 G4HD = 1080i
745 CMDYD = 1080i
746 HGTVD = 1080i
747 FOODD = 1080i
748 TRTVD = 1080i
749 GOLFD = 1080i
750 DSCHD = 1080i
751 APHD = 1080i
752 TLCHD = 1080i
753 E! HD = 1080i
754 VELOC = 1080i
755 TRAVD = 1080i
756 SCIHD = 1080i
757 NGCWD = 720p
758 HISHD = 720p
759 CNNHD = 1080i
760 FNCHD = 720p
761 FBNHD = 720p
762 CNBCD = 1080i
763 DXDHD = 720p
764 AXSTV = 1080i
766 TOOND = 1080i
767 NICWD = 1080i
768 FAMD = 720p
769 DISWD = 720p
770 SPRHD = 1080i
771 DESTD = 1080i
772 BIOHD = 720p
773 OXYHD = 1080i
774 HLNHD = 1080i
775 WGNA = 1080i
776 TWCHD = 1080i
777 BETD = 1080i
778 CMTHD = 1080i
779 FUSED = 1080i
780 CSN+H = 1080i
781 VH1HD = 1080i
782 MTVHD = 1080i
783 PLDHD = 1080i
784 OUTHD = 1080i
785 NFLRD = 1080i
786 TNND = 1080i
787 MSNBC = 1080i
788 ESPNU = 720p
789 TCMHD = 1080i
790 IFCHD = 1080i
791 WE HD = 1080i
793 HCHD = 1080i
794 HALLD = 1080i
795 LIFEH = 1080i
796 LMNHD = 1080i
797 MGMH = 1080i
798 AMCHD = 1080i
801 HBOWD = 1080i
803 FSOCD = 720p
804 IDHD = 1080i
805 H2 HD = 720p
806 WILDH = 720p
808 HBOLD = 1080i
809 ENCHD = 1080i
810 BBCAM = 1080i
811 HSNHD = 1080i
812 QVCHD = 1080i
813 HUBHD = 1080i
814 GMCHD = 1080i
815 GALAH = 1080i
816 SZHDW = 1080i
822 GSNHD = 1080i
823 P12BA = 1080i
825 SHOHD = 1080i
838 MXHD = 1080i
847 TMCW = 1080i
On 10/26/2012 6:22 AM, Craig Birkmaier wrote:
Ron
Thanls for the peek behind the curtain. The view from a production
brewer is not the same as I had when I was attending MPEG meetings and
working with all of the encoding vendors.
I continue to be disturbed by the notion that new standards should be
backward compatible to interlace. Concatenating two compression
schemes has never been a good idea, especially given the problems
dealing with "missing information." In the early '90s we tried to
educate broadcasters that the best approach was to invest in
professional quality de-interlacing equipment, then encode everything
in progressive formats. At the time, de-interlacing science was
evolving along a similar path to compression standards - that is, the
technology was evolving quickly as more MIPs could be dedicated to
real time processing.
Ironically, the need for de-interlacing fell upon cheap chips in HD
receivers to refresh progressive displays, rather than high quality
de-interlacing at the station before encoding and broadcast.
The "smartphone kids" understood the realities of working in an all
progressive environment - clearly they got it right.
Today it seems absurd to be talking about encoding of interlaced
sources, when de-interlacing technology is widely available and
substantially better than it was two decades ago...
It's hard to believe that we've been arguing about this for two
decades...
;-)
Yesterday, during Apple's fourth quarter earning conference call Tim
Cook spent several minutes talking about the broadcast organizations,
including the BBC, that are capturing stories using an iPhone.
Time for another beer!
Regards
Craig
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts: