Bug#722442: w-scan: no channels found

[Janusz S. Bień]

Package: w-scan
Version: 20120605-1
Severity: important

I tried to use w_scan for creating the initial tuning data for other
scanning utilities. Finally I created them by hand and succesfully used
dvbv5-scan, which found almost hundred channels. Here are the details of
a sample channel:

[TVP 1]
	SERVICE_ID = 101
	VIDEO_PID = 101
	AUDIO_PID = 102 108
	PID_06 = 106
	PID_05 = 152
	FREQUENCY = 546000000
	MODULATION = QAM/256
	INVERSION = AUTO
	SYMBOL_RATE = 6900000
	INNER_FEC = NONE
	DELIVERY_SYSTEM = DVBC/ANNEX_A


I tried in particular the following parameters:

w_scan -fc -c PL -x

w_scan -v -fc -c PL -t 3 -x

w_scan -vv -fc -c PL -i 0 -t 3 -x

w_scan -vvv -fc -c PL -i 1 -t 3 -x

w_scan -vvv -fc -c PL -Q 1 -S 0 -i 1 -t 3 -x

Here are the excerpts from the output of the last call:

--8<---------------cut here---------------start------------->8---
w_scan version 20120605 (compiled for DVB API 5.4)
using settings for POLAND
DVB cable
DVB-C
scan type CABLE, channellist 7
output format initial tuning data
WARNING: could not guess your codepage. Falling back to 'UTF-8'
output charset 'UTF-8', use -C <charset> to override
Info: using DVB adapter auto detection.
	===================== DRXK DVB-C DVB-T =================================
	len = 3
	0x00: 01 12 03                                        :    
	========================================================================
	/dev/dvb/adapter0/frontend0 -> CABLE "DRXK DVB-C DVB-T": good :-)
Using CABLE frontend (adapter /dev/dvb/adapter0/frontend0)
-_-_-_-_ Getting frontend capabilities-_-_-_-_ 
Using DVB API 5.a
frontend 'DRXK DVB-C DVB-T' supports
INVERSION_AUTO
QAM_AUTO not supported, trying QAM_256.
FEC_AUTO
FREQ (47.00MHz ... 865.00MHz)
SRATE (0.870MSym/s ... 11.700MSym/s)
-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ 

[...]

chan_to_freq:1993: channellist=7, base_offset=138000000, channel=50, step=8000000
chan_to_freq:1993: channellist=7, base_offset=138000000, channel=50, step=8000000
chan_to_freq:1993: channellist=7, base_offset=138000000, channel=50, step=8000000
chan_to_freq:1993: channellist=7, base_offset=138000000, channel=50, step=8000000
chan_to_freq:1993: channellist=7, base_offset=138000000, channel=51, step=8000000
546000: sr6900 (time: 01:49) set_frontend:1789: set_frontend: using DVB API 5.a

chan_to_freq:1993: channellist=7, base_offset=138000000, channel=51, step=8000000
chan_to_freq:1993: channellist=7, base_offset=138000000, channel=51, step=8000000
chan_to_freq:1993: channellist=7, base_offset=138000000, channel=51, step=8000000
chan_to_freq:1993: channellist=7, base_offset=138000000, channel=51, step=8000000
chan_to_freq:1993: channellist=7, base_offset=138000000, channel=52, step=8000000
554000: sr6900 (time: 01:52) set_frontend:1789: set_frontend: using DVB API 5.a


[...]

ERROR: Sorry - i couldn't get any working frequency/transponder
 Nothing to scan!!

--8<---------------cut here---------------end--------------->8---

Just in case I compiled the upstream version and got the same problem.

Is the scanned cable (UPC Poland in the Warsaw region) somehow peculiar
or the program is buggy?

What is the function of the country parameter/

What is the meaning of "channellist=7"?

BTW, I had to compile the kernel myself, because device is Technisat
CableStar Combo HD CI and requires a trivial patch to the kernel 3.9 or
higher, cf.

http://www.linuxtv.org/wiki/index.php/TechniSat_CableStar_Combo_HD_CI

Best regards

Janusz

-- System Information:
Debian Release: 7.1
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 3.10.0 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages w-scan depends on:
ii  libc6  2.13-38

w-scan recommends no packages.

w-scan suggests no packages.

-- no debconf information