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HEVC / H265 stream support for 4K test transmissions?

Added by Stephen Neal over 10 years ago

Any interest in adding support for HEVC streams, as being broadcast via DVB-T2 from three UK transmitters using COM8's frequencies during the World Cup. They're carrying test 4K content, HEVC encoded. DVB Viewer tunes and records under Windows (and can view with recent LAVFilters installed).

The OpenHEVC ffmpeg fork will play them using ffplay. You need a pretty powerful CPU to get real time 4K. I've tried both 1/4 screen crop and scale to 1920x1080. (Don't have a 4K set)


Replies (6)

RE: HEVC / H265 stream support for 4K test transmissions? - Added by Stephen Neal over 10 years ago

For info - HEVC and 3840x2160 at up to 60p (and with 10 bit video I believe) have been rolled into the latest DVB spec here : https://www.dvb.org/resources/public/standards/a157_dvb-avc-mpeg2.pdf

RE: HEVC / H265 stream support for 4K test transmissions? - Added by Stephen Neal over 10 years ago

Cheers Professor Yaffle. Do you expect this to work with HEVC enabled builds of XBMC? Thinking about it - VLC may now have HEVC support with a fast implementation, as one of the VLC devs has been blogging about HEVC quite a lot.

AIUI VLC use the x265 codec library and FFMPEG are using the OpenHEVC implementation. Wonder which is faster on an i7-2600K at 4GHz?

RE: HEVC / H265 stream support for 4K test transmissions? - Added by Prof Yaffle over 10 years ago

Shouldn't make a difference if they're following the standards - H.265/HEVC is the standard, x265 or OpenHEVC are the applications to produce a standards-compliant target. If it doesn't work, then something's doing something wrong in the system, as it should be interchangeable AIUI.

RE: HEVC / H265 stream support for 4K test transmissions? - Added by Andre Newman over 10 years ago

Interesting, I registered to provide some mux dumps and ask if hevc h.265 support could be added and found this thread.
I'll give it a try, there are a couple of UHD test transmissions running that I know, one on Astra 1 at 19.2E and another on Hotbird 13E, I've been recording using mux dumps so far but a proper scheduled recording would be wonderful.

Also FYI I have a 4Ghz devils canyon i7 and it plays the BBC Ultra HD World Cup transmissions at ~ 60% cpu with the Kodi (XBMC) 14 nightly builds, running on Ubuntu 12.0.4.5 64bit. Commonwealth Games transmissions at ~35% cpu on all cores, I have a small overclock to 4.6Ghz but maybe this isn't necessary any more.

Andre

RE: HEVC / H265 stream support for 4K test transmissions? - Added by Andre Newman over 10 years ago

Works fine on Hotbird hevc ultra hd test channel "HOT BIRD 4k1" and also Astra 1 test channel "UHD Demo Channel P1", excellent. You need to use ts passthrough not mkv but I prefer ts anyway.

The BBC Ultra HD DVBT2 transmissions have stopped now but if they start up again I'll give it a try.

Now to go work with the Kodi guys to get htsp streaming working :-)

Andre

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