From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx1.redhat.com ([209.132.183.28]:30972 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751514Ab1CaKpU (ORCPT ); Thu, 31 Mar 2011 06:45:20 -0400 Message-ID: <4D945B39.8050708@redhat.com> Date: Thu, 31 Mar 2011 07:45:13 -0300 From: Mauro Carvalho Chehab MIME-Version: 1.0 To: handygewinnspiel@gmx.de CC: linux-media@vger.kernel.org Subject: Re: [w_scan PATCH] Add Brazil support on w_scan References: <4D909B59.9040809@redhat.com> <20110328172045.64750@gmx.net> <4D90D78F.7050308@redhat.com> <20110329201152.282620@gmx.net> <4D92697C.3030209@redhat.com> In-Reply-To: <4D92697C.3030209@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit List-ID: Sender: Em 29-03-2011 20:21, Mauro Carvalho Chehab escreveu: > Em 29-03-2011 17:11, handygewinnspiel@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