From owner-freebsd-multimedia@FreeBSD.ORG Mon Jun 18 17:21:48 2012 Return-Path: Delivered-To: freebsd-multimedia@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id EA9C410656AB for ; Mon, 18 Jun 2012 17:21:48 +0000 (UTC) (envelope-from dieterbsd@engineer.com) Received: from mailout-us.gmx.com (mailout-us.gmx.com [74.208.5.67]) by mx1.freebsd.org (Postfix) with SMTP id 8D0628FC12 for ; Mon, 18 Jun 2012 17:21:48 +0000 (UTC) Received: (qmail 31173 invoked by uid 0); 18 Jun 2012 17:21:47 -0000 Received: from 67.206.186.186 by rms-us009.v300.gmx.net with HTTP Content-Type: text/plain; charset="utf-8" Date: Mon, 18 Jun 2012 13:21:43 -0400 From: "Dieter BSD" Message-ID: <20120618172144.303410@gmx.com> MIME-Version: 1.0 To: freebsd-multimedia@freebsd.org X-Authenticated: #74169980 X-Flags: 0001 X-Mailer: GMX.com Web Mailer x-registered: 0 Content-Transfer-Encoding: 8bit X-GMX-UID: /watb+EX3zOlNR3dAHAhC/N+IGRvbwAm Cc: freebsd-hackers@freebsd.org Subject: Re: how to turn my computer into a TV X-BeenThere: freebsd-multimedia@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Multimedia discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Jun 2012 17:21:49 -0000 user.vdr writes: > Recording doesn't require any compression unless you are transcoding > in real-time. There's no difference between recording ATSC, NTSC, PAL, > etc, and it's actually irrelevant what the stream is. This is incorrect.  ATSC is compressed before broadcast, so you receive the data already compresed.  NTSC and PAL are broadcast in analog.  The tuner performs A-to-D which gives an uncompressed data stream.  Have fun trying to store that. As a practical matter, you have to compress the data in real time. Some, not all, tuners include hardware compression. > Lastly, it's possible to save a single channel or the entire stream > which usually contains several channels. Even when saving the full > stream, it likely uses far less bandwidth than your media offers so > there's no problem there. This appariently refers to ATSC.  Yes, modern disks have plenty of bandwidth to store the entire ATSC stream.  The main reason to filter PIDs is to save disk *space*.  Also, some software can't select which program to decode. Wojciech writes: > most people vastly underestimate power of modern CPUs. Many people overestimate the "moderness" of most people's CPUs.