Mauro Borghi wrote: > > Hello all, > first of all a brief intro :-) > > For the first time here in Torino, RAI (Italy's public television > broadcaster) is broadcasting an experimental DVB-T channel, featuring in > high definition the Olympic Winter Games. > > They are exploiting *hierarchical* modulation, in order to accomodate > -in the same radio channel- both a DVB-H test stream and this HDTV stream. > The low bitrate DVB-H stream is the "high priority" stream, while the > HDTV stream (H.264/AVC) is the "low priority" one. > > From the information I got from devices supporting hierarchical mode, > tuning data are as following: > > RAIHD:538000000:INVERSION_OFF:BANDWIDTH_8_MHZ:\ > FEC_1_2:FEC_3_4:QAM_64:TRANSMISSION_MODE_8K:\ > GUARD_INTERVAL_1_8:HIERARCHY_2:x:x:x > > [intro end] > > Do you know about LinuxDVB-supported devices which are known to support > hierarchical modulation? > Is it meant to be sufficient setting HIERARCHY_2 in the struct passed to > the frontend device when tuning, in order to select the LOW priority > stream? > > From the tests I did with a Twinhan 7045 USB2 clone (from digicom), the > device seems to always lock on the HIGH priority stream, no matter what > params are passed! > > Ciao, > Mauro. > > PS: unfortunately, even if I could correctly tune the HD stream, it > would be encrypted (Irdeto CAS)... :-( > However, I'm curious about additional info I could get from stream > analysis. Hello Try to tune the card and look at the output of "scan -a -c card_number" You'll get a stream analysis (PAT and PMT decode) Regards -- Brice http://mumudvb.braice.net _______________________________________________ linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
