Em 29-03-2011 20:21, Mauro Carvalho Chehab escreveu:
> Em 29-03-2011 17:11, handygewinnsp...@gmx.de escreveu:
>> So I changed it now to scan any srate for 6MHz networks, but skip over those
>> which are unsupported by bandwidth limitation.
...
> Anyway, I'll test the today's version and reply if I detect any troubles on
> it.
Test results:
$ ./w_scan -c BR -fc
Took about 30 mins for scan. As the board I'm using doesn't support QAM_AUTO
for DVB-C, it seek only QAM_64. No channels detected.
$ ./w_scan -c BR -fc -Q1
Took about 30 mins for scan. Channels were properly detected.
$ ./w_scan -c BR -fc -Q1 -S13
Took about 10 mins for scan. Channels were properly detected.
IMHO, the default, if QAM_AUTO is not supported and -Q parameter is not used,
sould be to test for the most common QAM types, and not for just 64-QAM.
A search at dvb-apps transponders files (upstream + Net Digital Brazil DVB-C
freq)
show:
$ grep -l QAM64 /home/v4l/dvb-apps/util/scan/dvb-c/*|wc
31 31 1087
$ grep -l QAM256 /home/v4l/dvb-apps/util/scan/dvb-c/*|wc
18 18 859
$ grep -l QAM128 /home/v4l/dvb-apps/util/scan/dvb-c/*|wc
8 8 249
$ grep QAM /home/v4l/dvb-apps/util/scan/dvb-c/*|cut -d' ' -f 5|sort|uniq
-c|sort -n -r
372 QAM64
179 QAM256
72 QAM128
So, starting with QAM64 makes sense, but it makes sense also to test for
QAM256 and QAM128, if QAM_AUTO is not supported.
Cheers,
Mauro
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