From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C448C433DF for ; Tue, 9 Jun 2020 15:15:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E6092078C for ; Tue, 9 Jun 2020 15:15:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730715AbgFIPPz (ORCPT ); Tue, 9 Jun 2020 11:15:55 -0400 Received: from jpvw.nl ([80.127.100.2]:36064 "EHLO jpvw.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730436AbgFIPPz (ORCPT ); Tue, 9 Jun 2020 11:15:55 -0400 Received: from [127.0.0.1] (helo=jpvw.nl) by jpvw.nl with esmtp (Exim 4.93) (envelope-from ) id 1jifyh-000RBu-MU; Tue, 09 Jun 2020 17:15:51 +0200 Subject: Re: Scanning for TV channels over DVB-T and DVB-T2 To: Marc Gonzalez , linux-media References: <11fbc112-c410-8c67-9bcb-9450924d12ef@free.fr> From: JP Message-ID: <3d62014d-4a02-6631-6989-37f67118f7ea@jpvw.nl> Date: Tue, 9 Jun 2020 17:15:51 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <11fbc112-c410-8c67-9bcb-9450924d12ef@free.fr> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On 6/8/20 5:30 PM, Marc Gonzalez wrote: > Hello, > > Suppose we know that several channels are transmitted on a given frequency > by terrestrial antenna. However, we don't know if the signal is "encoded" > (not sure this is the right term) in DVB-T or DVB-T2 modulation. > > Do we have to scan the frequency /twice/ > first with DTV_DELIVERY_SYSTEM = SYS_DVBT > then with DTV_DELIVERY_SYSTEM = SYS_DVBT2 ? > > Or is there some optimization where both modulations are handled > in a single step? > > Or maybe it depends on the tuner driver? It depends on the scan tool. Last time I used one te create my channel list I had to give a parameters to the command to skip encoded channels. That was over a year ago; I don't remeber any specifics. Jan Pieter. > Regards.