Thanks for the info I do need it to be real time actually As for your concerns about the Emm. All I need to do is disable one not edit it, so it's either a re package of the steam or a jam of a specific header.
Can you point me to a working dvb-t project? Thanks again On Saturday, May 4, 2013, Marcus Müller wrote: > Hi Dino, > > DVB-T works in the UHF / VHF frequency bands, something you can tune > your wbx at without problems. > Bandwidth is about 8MHz (if I'm not mistaken), so that's low enough. > Since it sounds like you'll be doing stuff offline (not in realtime), > processing power is not a factor for your problem, either. > > DVB-T generally uses OFDM with large numbers of bins (2^11 or 2^13-bin > fft), generous guard intervals and whatnot. A moderately complex system, > but someone has already implemented a dvb-t modulator in GNU Radio[1], you > can take a look at that, but I doubt it would work with current versions of > GNU Radio. > > Regarding to your EMM "hint": You do have to realize that EMMs are rather > "high level" concepts; you need to encode them into a data stream, mux them > together with the video stream, encode that whole thing, map it to the > correct OFDM carriers and transmit that. > Since what we're talking about are messages meant to inform decryption > devices about their working state, I guess it won't be as easy as > replaying EMMs you captured, since it most probably carries keys for > specific content. Then, on the other hand, TV encryption in the 90s has > gained notority for being broken shortly after deployment, so this is > actually an interesting field of research for someone with a cryptographic > background (which I can't claim to have). > > Happy hacking > > Marcus > > > [1] PELLEGRINI, Vincenzo; BACCI, Giacomo; LUISE, Marco. Soft-dvb: A > fully-software gnuradio-based etsi dvb-t modulator. Proc. WSR, 2008, 8. Jg. > Am 03.05.2013 23:35, schrieb Dinos Pastos: > >> Hi there, >> >> I have a USRP2 with WBX board which has been sitting around doing nothing. >> I was wondering if it is possible to use this hardware to get a live >> DVB-T signal and replay it back. >> >> What I want to do is to intercept entitlement management messages and >> modify/remove them on the fly. >> >> Please let me know if there is such support with this hardware or even a >> previous project that tackles this request. >> >> Regards >> >> Dino >> >> >> ______________________________**_________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/**listinfo/discuss-gnuradio<https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> >> >> > > ______________________________**_________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/**listinfo/discuss-gnuradio<https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> >
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