I wrote: > My DVB card also receives some strange multicast packets. Guys from the > antenna company told me that this is a TV or radio broadcast and advised > not to hack them, but they are interested to sell me their decoder box, > so I'll ignore their advice if possible. Local news sites mention that > DVB-H is being tested, but these packets don't look like DVB-H payload, > because they are IPv4. > > Here is a packet dump (1300 KB): http://ums.usu.ru/~patrakov/udp.dump > > Is this "UDP encapsulated MPEG TS"? If not, what's this and how to > decode it? > > Today they changed the broadcast format on this 626 MHz frequency, it is DVB-T now (H.264 SD video + MP2 audio), so the decoding problem no longer exists on 626 MHz. However, on 482 MHz, something strange happens: w_scan says that the signal is present, but can't detect any PIDs. "dvbtune -f 482000000 -bw 8 -tm 8 -gi 32 -m" returns the following: Using DVB card "Philips TDA10046H DVB-T" tuning DVB-T (in United Kingdom) to 482000000 Hz polling.... Getting frontend event Overflow error, trying again (status = -1, errno = 75)FE_STATUS: polling.... Getting frontend event FE_STATUS: polling.... Getting frontend event FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC Bit error rate: 57972 Signal strength: 28784 SNR: 59110 FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC Signal=29041, Verror=58018, SNR=59110dB, BlockErrors=-1, (S|L|C|V|SY|) Signal=28013, Verror=58234, SNR=59367dB, BlockErrors=-1, (S|L|C|V|SY|) Signal=28013, Verror=56764, SNR=58853dB, BlockErrors=-1, (S|L|C|V|SY|) Signal=28013, Verror=57162, SNR=59367dB, BlockErrors=-1, (S|L|C|V|SY|) Signal=26214, Verror=131070, SNR=19789dB, BlockErrors=0, (S|V|) Signal=26471, Verror=59754, SNR=58596dB, BlockErrors=-1, (S|L|C|V|SY|) Signal=24672, Verror=131070, SNR=20303dB, BlockErrors=0, (S|) Signal=12336, Verror=58104, SNR=58853dB, BlockErrors=-1, (S|L|C|V|SY|) Signal=23644, Verror=58192, SNR=58853dB, BlockErrors=-1, () Signal=27756, Verror=131070, SNR=19789dB, BlockErrors=0, (S|) Signal=28270, Verror=58454, SNR=59367dB, BlockErrors=-1, (S|L|C|V|SY|) Signal=27756, Verror=57878, SNR=59110dB, BlockErrors=0, () Signal=27756, Verror=131070, SNR=20817dB, BlockErrors=41, (S|) Signal=27242, Verror=57768, SNR=59367dB, BlockErrors=-1, (S|L|C|V|SY|) Signal=27242, Verror=131070, SNR=28270dB, BlockErrors=0, (S|) Signal=27756, Verror=58136, SNR=59367dB, BlockErrors=-1, (S|L|C|V|SY|) Is this just a weak signal (on 626 MHz, Signal=50115 and Verror=0), or something indeed strange? The raw ts dump is available on request. -- Alexander E. Patrakov _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
