Login

disco4000 · 2018-04-05, 08:50 AM

Out of sheer curiosity I discovered the ability to capture UHD/4K DVB Streams with my 5 yr. old low cost linux receiver. Here is what happened:

Waiting for the CL match between Liv and ManCity yesterday evening, Sky repeatedly bombed its viewers with commercials for their UHD Sports Channels.
Having some unsorted ideas in mind I tuned into Sky Sports UHD just to see what happens. Of course the screen stayed black, but to my surprise sound was there!

OK, first conclusion:
- tuning into channel: OK
- CAM descrambling: OK
- DEMUX: OK
- decode audio: OK
- decode video: FAIL (of course!)
This was more than I expected.

Now, knowing that the stream recording on this receiver is done somewhere around the demuxing process, capturing this stream should work as it does with HD and SD streams. I set a timer for the first half of the game, and checked back during the half time intermission.
It worked! The stream opened and played in VLC, well, kind of - even my 2016 MBPro i7 QuadCore wasn’t able to play the stream somewhere near 50fps, maxing out all 4 cores at 100%.
I had no time to test other players yet, but I think without hardware acceleration I will be kind of lost on all of my machines.

I will follow up later with technical infos of the stream, screenshots and stream samples if possible.

Let’s hope Sky will launch a UHD movie channel in the near future.

d.

**CSchmidlapp** · 2018-04-05, 10:09 AM

Great stuff.
Makes sense it would work but I never would of thought to try it, Good work sir Smile

disco4000 · (This post was last modified: 2018-04-10, 10:23 AM by disco4000.)

I just managed to cut a 1:34min sample file with TSDoctor. It is Salah's goal for the 1:0 lead.
Below are the Media Infos, 4 Screenshots and links to the sample file as TS, MKV and MP4.
Please DL the samples and give me some feedback how the playback works on your machines or Smart TVs.

Media Info:

Screenshots:

Samples:
Transport Stream
Matroska
MP4

@CSchmidlapp: In retrospective I ask myself - where did this idea suddenly come from... Tongue

2018-04-06, 12:30 AM

Started downloading the .ts file and tried watching the unfinished download with MPC-HC. Ran kinda okay-ish. Sometimes there were artifacts on scene changes. Gotta try remuxing to mkv or mp4 once it's finished downloading.

The quality naturally is as bad as you would expect, considering the resolution, framerate and bitrate. Though I have to say it is watchable in 1080p (which my display is), even though it still looks hilariously smoothed.

All in all I think that a 1080p HDTV stream with the same bitrate will have a giant edge over this in terms of quality. Then again, this is a sports broadcast and they've always looked terrible/bitstarved. Would be curious how much bitrate they throw at feature films. Might start looking okay around 60-100 Mbps.

Thanks for sharing!

disco4000 · (This post was last modified: 2018-04-06, 07:51 AM by disco4000.)

@TomArrow: I agree, overall the quality is somehow disappointing, considering the available resolution.
I hardly doubt we will see any commercial channels with a bitrate >25Mbps in the near future. Bandwidth is money for cable providers and satellite owners and one UHD channel equals up to 4 HD channels.

**Dr. Cooper** · 2018-04-07, 06:50 PM

It's not new that you can capture stuff with Linux-receivers even though they're actually not capable of decoding the video. Back in 2008 I made a test-record of a World Cup-match on ORF1 HD with my old SD-Linux-receiver and it worked as well. That was the first time I saw a genuine HD-broadcast. Big Grin

What confuses me more is why you were able to descramble the German Sky UHD-programmes. I thought this was only possible with the Sky UHD-receiver as these channels usually don't work with Linux-softcams (like Sky 1 HD) and they don't offer these channels for customers with CI+ modules. At least it still doesn't work for me, just tried it again on Sky Bundesliga UHD. Wink

disco4000 · 2018-04-10, 10:28 AM

@Dr. Cooper: Sky doesn't offer this for customers with CI+ modules via satellite, that is correct. But if you are a customer of Kabel Deutschland or Unitymedia, you can book the Sky package onto your cable providers smartcard, and they don't care a s**t about your receiver. Beyond that it is quite easy using oscam.
I recently also build a tvheadend server using the smartcard. Works like a charm.

P.S.: Links have been updated

**Dr. Cooper** · (This post was last modified: 2018-04-12, 08:13 PM by Dr. Cooper.)

Alright, that makes sense. I'm a satellite-customer, so that's the reason I'm still only getting a dark screen on the UHD-channels. Well, why shouldn't the cable-customers also have at least one advantage if they have to step back with anything else although they're paying the same rates as satellite-customers. Wink

Login
Username:
Password:	Lost Password?
	Remember me

Possibly Related Threads…
Thread		Author	Replies	Views	Last Post
	Laserdisc PCM Capture Guide	bronan	144	72,541	2024-11-29, 09:59 AM Last Post: ilpubzo5ie
	Go-to method for VHS capture	Kreeep	11	4,090	2024-05-24, 03:47 PM Last Post: bronan
	Locations List of people willing to assist with bit-perfect LD audio capture	jerryshadoe	46	43,468	2023-09-03, 01:07 AM Last Post: onlysleeping23
	Viability of cheap VHS capture	Feallan	248	209,619	2021-08-02, 05:51 PM Last Post: crissrudd4554
	Analog Audio Capture	alexp2000	5	3,235	2021-07-23, 09:43 PM Last Post: zoidberg
	Laserdisc capture - general thread	willie1959	69	50,929	2021-03-08, 06:53 PM Last Post: pipefan413
	Sync problems during analog capture?	BusterD	13	10,113	2021-02-19, 07:17 PM Last Post: BusterD
	4K Capture Card Recommendations.	PDB	1	2,770	2021-01-19, 06:20 AM Last Post: usagi
	multichannel audio capture card ≥ 4 line in	spoRv	4	4,639	2020-12-17, 08:02 AM Last Post: deleted user
	High-end audio capture cards	spoRv	24	24,233	2020-11-17, 11:32 AM Last Post: pipefan413