[linux-dvb] Avermedia 771 tunes but no data

Barry Myles linuxtv at smyles.plus.com
Mon Jul 25 21:52:42 CEST 2005


Hamish Moffatt wrote:
> Are you sure that the PIDs are correct? If not, it will tune but you
> will get no data.
Thanks for that. I suspect that something like that is what is wrong. 
I've just run scan with the frequency file for my transmitter [UK - 
SudburyB] and this seems to generate a file containing the expected set 
of channels which I save as ~/.tzap/channels.conf. I then can run tzap 
against each of the channels and it seems to pick up the PID from the 
channels.conf but doesn't give any data.

Am I missing a step somewhere?

example:

mythtv szap # ./tzap five
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
tuning to 690166670 Hz
video pid 0x1781, audio pid 0x1782
status 01 | signal ffce | snr 0000 | ber 00000000 | unc 00000000 |
status 1f | signal ffcc | snr b4b4 | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal ffe7 | snr b6b6 | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK

mythtv szap # grep ~/.tzap/channels.conf five
five:690166670:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE:6017:6018:12866

6017 decimal = 1781 hex

which looks good, but is obviously missing something.

-- 
Barry Myles




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