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.
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