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Cable TV descrambler in SOFTWARE

By in News
Mon Feb 14, 2000 at 06:01:37 AM EST
Tags: Software (all tags)

Source code and information about a NTSC cable descrambling breakthrough using personal computers equipped with a popular tuner chipset and some very clever programming (though crude) can be found at http://fscktv.fortyoz.org/. 30 Frames/sec is possible. The US DCMA and/or patent law may make this link illegal one day!

[editor's note, by rusty: Doubtless the use of this is just as illegal as hardware cable descrambling, but it's kinda interesting anyway. Read on for some gratuitous /. flaming by our Anon author.]

This poor link may get slashdotted once that pathetic techie site, aka "big money sellouts" talks about it in a few weeks or days, so get the sneaky source to the modified bttv.c kernel driver while you can. I Just wanted to ensure that the massive hordes of people leaving Slashdot wandering around aimlessly looking for a new techie site with FRESH stories have somewhere to turn to for interesting techie news. --Fatal Error


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Cable TV descrambler in SOFTWARE | 5 comments (5 topical, editorial, 0 hidden)
Re: Cable TV descrambler in SOFTWARE (5.00 / 1) (#1)
by hattig on Mon Feb 14, 2000 at 01:13:40 PM EST

I feel sorry for this story... so neglected...

In the UK where digital satellite television with interactive content rules supreme, there used to be a device for the old analogue satellite devices that you plugged in the smartcard socket, and it would do a brute force attack on the pin number of the device until it succeeded. Obviously, this wasn't liked, and Sky could only change their codes every few weeks because of limitations in the system they were using (designed around the mid-80's, so you can't really blame it). Lots of people enjoyed free Sky TV in Europe and the UK!

Anyone got it working yet? (3.00 / 1) (#2)
by Anonymous Hero on Mon Feb 14, 2000 at 05:54:00 PM EST

It compiled and inserted, etc. Picture looked really bad on non-scrambled channels, and didn't seem to descramble at all, even after playing with the hackvalues. Any successes?

BTW, this is my first time posting here. This site seems pretty tight. It has made my bookmark list.

Can't get Vert/Horiz Hold working! (none / 0) (#3)
by jwsh on Mon Feb 14, 2000 at 07:52:29 PM EST

It shows the picture in fairly sharp black and white, and it is properly aligned (normally it would lean to the side, and flip around and stuff) but despite tweaking the hackvalue to no end, I cannot get the picture to stop moving vertically and horizontally. If anyone has been able to get it to work, I'd greatly appreciate their assistance, or at the very least, the 'hackvalue' that worked for them!

Re: Cable TV descrambler in SOFTWARE (5.00 / 1) (#4)
by Anonymous Hero on Tue Feb 15, 2000 at 01:43:40 AM EST

Works for me. Timer Warner NC.
Follow the readme...
Once you get to tuning the image:
1. Get the white bar vertical... It will still move across the screen horizontally, just get it reasonably vertical.
(Insert/ Delete)

At this pont you may have a horizontal bar that splits the screen.. thats ok.

2. Use (Home and/or End) to slow down the horizontal movement. Once you get it moving slowly, try to stop it
with the fine adjust(PgUp/PgDn). Get the vertical bar
off the screen by letting it go off one side of the screen.

3. If you have a Horizontal bar splitting the screen, go back and use (Insert and Delete) to through the sync off and let the bar move to the top or bottom of the screen. Once it moves off the screen, resync the vertical white bar. This will
place the vertical white bar somewhere on the screen. Remove it as in step 2.

When the white bar is at the edge of the screen, press 's'.
to lock...

This has done it for me. You will get the hang of it.

Auto stabilizing will come soon. Patience. (4.00 / 1) (#5)
by Anonymous Hero on Tue Feb 15, 2000 at 05:17:17 AM EST

Later versions will no doubt auto sync and auto tune. Other people will take this source and make it work well. We are at the dawn of this historic new technology and luckily for us, the BT tuner chipsets for NTSC are fairly standardized and ubiquitous across many card designs. Because the bitmap data is forceable in the digital domain, and because signals, especially cable tv signals, have very regular and very well defined vertical sync bands (every channel on the entire cable is resynced to the same heartbeat by the way), there will be ability to offer drift free auto syncing. Changing channels too often will get messy in the second gen code to come from this, but Kuro5hin.org can at least help by providing valuable forum for minor little notes such as these in this thread. Of course you don't want to have too many people claim authorship of mods complete with physical residence addresses or else we will see the same legal court actions against free speech that the Livid newslists sufferred from last month.

(Livid is the combined group effort, temporarily open source, DVD player for Linux that is fast becommming a US supreme court test case. If you disseminate Livid source in psuedo english using a tool that can reassemble the words back into C, you can still legally challenge the federal court ruling, so at worst case this source may be one day distributed in psuedo english. I wish it was still 1999 and then none of this would be an issue.).

[ Parent ]
Cable TV descrambler in SOFTWARE | 5 comments (5 topical, 0 editorial, 0 hidden)
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