COM8 running - has PIDs

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polarice

22-06-2014

I can tune this from WH - hearing the audio, no video. Video is 36Mbits. Using Windows.
Have T2 stick but don't know how to use it on linux. Linux is useless for desktop - nothing works.

Greebo

22-06-2014

Originally Posted by polarice:
“... Have T2 stick but don't know how to use it on linux. Linux is useless for desktop - nothing works.”

Nice trolling. This isn't the place, but there are plenty of forums where people will help you if you ask nicely. But if you post like that they'll go into pedantic mode and point out that Linux is an operating system kernel and doesn't have a desktop. Whatever desktop problems you have may be specific to the distribution you tried - e.g. ubuntu, fedora, redhat, suse, etc...

Yes, none of the desktops are the same as MS Windows and maybe aren't as user friendly as Windows 7* for someone with experience of windows - which is almost all of us - but there is power in the linux distributions there if you want it. I wouldn't have a clue how to script the sort of automated freeview mux tests that my media pc machine runs reliably for months on end if it was restricted to windows.

* but they are probably more friendly than Windows 8...

figrin_dan

23-06-2014

Originally Posted by kasg:
“I can confirm that I am getting a strong signal on UHF ch 35 from Crystal Palace.”

Yep, well as strong as Com7 anyway.

a516

23-06-2014

Anyone on Black Hill in Scotland seeing the tests?

kasg

23-06-2014

Originally Posted by figrin_dan:
“Yep, well as strong as Com7 anyway.”

Despite my vast distance from the transmitter and their lower power, COM7 and COM8 are at least as strong as the other muxes here.

pad_ehh

23-06-2014

Wonder what channel COM8 will be on from Divis and if any tests have started yet...?

technologist

23-06-2014

I would expect that only the transmitters serving BBC R&D would be illuminated ....
And maybe use IP as well as MPEG TS PLPs .

Colin_London

23-06-2014

Originally Posted by technologist:
“I would expect that only the transmitters serving BBC R&D would be illuminated ....
And maybe use IP as well as MPEG TS PLPs .”

Agree - it'll almost certainly be CP & WH only.

Don't get excited everybody - this is not COM8 launch....

Kieran_K

23-06-2014

I was able to play a recording from COM8 Crystal Palace. I wrote a bit about it here:
http://www.obe.tv/about-us/obe-blog/...st-look-at-bbc

kasg

23-06-2014

That is one of the most impressive first posts I have seen - brilliant.

Colin_London

23-06-2014

Originally Posted by Kieran_K:
“I was able to play a recording from COM8 Crystal Palace. I wrote a bit about it here:
http://www.obe.tv/about-us/obe-blog/...st-look-at-bbc”

Fantastic work

Amazing detail of the pigeon poo on that street lamp in that screencap!

Greebo

23-06-2014

Originally Posted by Kieran_K:
“I was able to play a recording from COM8 Crystal Palace. I wrote a bit about it here:
http://www.obe.tv/about-us/obe-blog/...st-look-at-bbc”

Brilliant. I've manged to install a recent ffmpeg and can replicate the ffprobe and ffmpeg -benchmark results - though I only see 10fps on a slower pc than yours.

a516

24-06-2014

Originally Posted by Colin_London:
“Agree - it'll almost certainly be CP & WH only.
...”

BBC R&D have confirmed three transmitter sites. Black Hill is the third.
http://www.bbc.co.uk/rd/blog/2014/06...inition-trials

anthony david

24-06-2014

Presumably this will allow viewings at BH, Salford Quays and Pacific Quay.

Greebo

24-06-2014

Just as a follow on to post #2, I've updated to the latest release build of mediainfo and this build does identify PID 101 as HEVC:

Code:

General
ID                                       : 61440 (0xF000)
Complete name                            : com8.wh.ts
Format                                   : MPEG-TS
File size                                : 289 MiB
Duration                                 : 1mn 0s
Start time                               : UTC 2014-06-22 18:26:04
End time                                 : UTC 2014-06-22 18:27:03
Overall bit rate mode                    : Constant
Overall bit rate                         : 40.1 Mbps
Network name                             : Test
Original network name                    : UK Digital Terrestrial Television
Country                                  : GBR
Timezone                                 : +01:00:00

Video
ID                                       : 101 (0x65)
Menu ID                                  : 61440 (0xF000) / 61504 (0xF040)
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Codec ID                                 : 36
Duration                                 : 1mn 0s

Audio
ID                                       : 102 (0x66)
Menu ID                                  : 61440 (0xF000) / 61504 (0xF040)
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Muxing mode                              : LATM
Codec ID                                 : 17
Duration                                 : 1mn 0s
Bit rate mode                            : Variable
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 KHz
Compression mode                         : Lossy
Delay relative to video                  : -577ms
Language                                 : English

Menu #1
ID                                       : 100 (0x64)
Menu ID                                  : 61440 (0xF000)
List                                     : 101 (0x65) (HEVC) / 102 (0x66) (AAC, English)
Language                                 :  / English
Service name                             : Test
Service type                             : reserved for future use
UTC 2014-06-22 00:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 01:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 02:00:00                  : en:  / en:  /  /  / 01:00:00 / 
<snipped 11 lines>
UTC 2014-06-22 15:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 16:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 17:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 18:00:00                  : en:  / en:  /  /  / 01:00:00 / Running
UTC 2014-06-22 19:00:00                  : en:  / en:  /  /  / 01:00:00 / Not running
UTC 2014-06-22 20:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 21:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 22:00:00                  : en:  / en:  /  /  / 01:00:00 / 
<snipped many lines>
UTC 2014-06-29 21:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-29 22:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-29 23:00:00                  : en:  / en:  /  /  / 01:00:00 / 

Menu #2
ID                                       : 200 (0xC8)
Menu ID                                  : 61504 (0xF040)
List                                     : 101 (0x65) (HEVC) / 102 (0x66) (AAC, English)
Language                                 :  / English
Service name                             : Test.
Service type                             : reserved for future use
UTC 2014-06-22 00:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 01:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 02:00:00                  : en:  / en:  /  /  / 01:00:00 / 
<snipped 12 lines>
UTC 2014-06-22 15:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 16:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 17:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 18:00:00                  : en:  / en:  /  /  / 01:00:00 / Running
UTC 2014-06-22 19:00:00                  : en:  / en:  /  /  / 01:00:00 / Not running
UTC 2014-06-22 20:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-22 21:00:00                  : en:  / en:  /  /  / 01:00:00 / 
<snipped many lines>
UTC 2014-06-29 17:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-29 18:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-29 19:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-29 20:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-29 21:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-29 22:00:00                  : en:  / en:  /  /  / 01:00:00 / 
UTC 2014-06-29 23:00:00                  : en:  / en:  /  /  / 01:00:00 /

I've also figured out how to extract frames from the HEVC video using a very recent build of ffmpeg and can see the same sort of image that Kieran_K reported. If anyone else wants to replicate it, use something like:

Code:

ffmpeg -i /tmp/com8.ts -f image2 -vf fps=fps=1/10 /tmp/img%01d.png

OwenSmith

24-06-2014

I'm disappointed to see that while the video is HEVC, the audio is only stereo.

lotrjw

24-06-2014

Originally Posted by OwenSmith:
“I'm disappointed to see that while the video is HEVC, the audio is only stereo.”

I guess that they dont need to test the audio though, so its simpler to just stick stereo on, as this test is all about the picture!

OwenSmith

24-06-2014

Originally Posted by lotrjw:
“I guess that they dont need to test the audio though, so its simpler to just stick stereo on, as this test is all about the picture!”

It makes the test less valid in my view. No broadcaster except ITV would be dumb enough to broadcast a UHD service with stereo audio.

Greebo

24-06-2014

Originally Posted by OwenSmith:
“It makes the test less valid in my view. No broadcaster except ITV would be dumb enough to broadcast a UHD service with stereo audio.”

This isn't the feed from Brazil though - the current video is just a looped recorded view out of someone's office window in London and the audio is a sweep tone.

I'll try to take a look at the stream during the test on Saturday and report back what it looks like then.

mossy2103

24-06-2014

Originally Posted by OwenSmith:
“It makes the test less valid in my view. No broadcaster except ITV would be dumb enough to broadcast a UHD service with stereo audio.”

But it's only a proof of concept closed test, not a proper transmission for public consumption (i.e. it's not a service). And as it stands, the picture is a feed from outdoors here, so why bother going to the trouble of recording & mixing a 5.1 audio feed?

figrin_dan

24-06-2014

I would say that if the video is an unknown then "simple audio" would be a quick way to tell that everything is set up properly. Once the video has been proven then they can just switch the audio.

figrin_dan

24-06-2014

Originally Posted by Greebo:
“I've also figured out how to extract frames from the HEVC video using a very recent build of ffmpeg and can see the same sort of image that Kieran_K reported. If anyone else wants to replicate it, use something like:”

If you can knock out 60 of these frames a second we're in business!

PrinceGaz

24-06-2014

Nothing on COM8 from Pontop Pike today.

What sort of CPU power are we going to need to decode HEVC, given that current video-cards don't have the dedicated hardware to do most of the work.

AVC is doable at 1920x1080 on a good dual-core CPU even without GPU support, but I imagine 1080p HEVC requires rather more work and current graphics cards won't be able to offload much of it.

Then a lot more horsepower will be needed for 4K HEVC.

kasg

24-06-2014

Originally Posted by PrinceGaz:
“Nothing on COM8 from Pontop Pike today.”

It has been confirmed that it is just Winter Hill, Crystal Palace and Black Hill.

Greebo

25-06-2014

Various new bits of info:

There is a new blog post following on from Kieran_K's previous one at http://www.obe.tv/about-us/obe-blog/...rld-cup-part-2

The nightly build of VLC ( http://nightlies.videolan.org ) can decode at least a frame of HEVC from the video stream on COM8 - and the prelease version of TSReader has some preliminary support for H265/HEVC. The development snapshot of mediainfo ( http://sourceforge.net/projects/medi...ots/0.7.69%2B/ ) has more detail on the video parameters:

Code:

Video
ID                                       : 101 (0x65)
Menu ID                                  : 61440 (0xF000) / 61504 (0xF040)
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main@L5.1
Codec ID                                 : 36
Duration                                 : 59s 509ms
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 59.940 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits

The video stream on COM8 has changed slightly this afternoon. Same parameters, but the audio is now a 1KHz test tone and the video is a static image - split into four quadrants each containing concentric circles - see here http://imgbox.com/cEaOj7EP

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