From owner-freebsd-hackers@FreeBSD.ORG Mon Jun 18 15:59:43 2012 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BBD74106566B; Mon, 18 Jun 2012 15:59:43 +0000 (UTC) (envelope-from user.vdr@gmail.com) Received: from mail-yw0-f54.google.com (mail-yw0-f54.google.com [209.85.213.54]) by mx1.freebsd.org (Postfix) with ESMTP id 57B458FC0C; Mon, 18 Jun 2012 15:59:43 +0000 (UTC) Received: by yhgm50 with SMTP id m50so4535567yhg.13 for ; Mon, 18 Jun 2012 08:59:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=Fy1Gapl0KXZZba86BpZpcVRhYb073AIJXljPmv7GbLQ=; b=D7inYqOoUcKw1omOWuHTPtyJZ/VFVnd2PjYpkU/JRh4eyb1gB2X4IAe+30bMqpWxXr O4hSwUrl2FNkGLmQWvQVg+A1EJAlBB56msqDs4y/vqxTMoZ+4vi5rh6Bs8cT7FDjexG/ jRhrQkXt7Xadyp+o4JLL/E2lr8TQAnEk0iart9awkDOd1A5r8Ldf9YoL4ExaLOzKHR6P ofs35g6M0REAOBw+a+xTGxW1y1h8y/IrCLOBQg0TZJmEe1TVW+AOTCcyl22WgXQYOX5m Mwlo98eAslJ7yuLzX1LyBWzLD+Y9RNTTJyJT52TtOZNcItib9xC80ZcKw4bpk8VVfger r05Q== MIME-Version: 1.0 Received: by 10.50.106.136 with SMTP id gu8mr9078314igb.23.1340035176923; Mon, 18 Jun 2012 08:59:36 -0700 (PDT) Received: by 10.231.189.201 with HTTP; Mon, 18 Jun 2012 08:59:36 -0700 (PDT) In-Reply-To: <20120618013118.303420@gmx.com> References: <20120618013118.303420@gmx.com> Date: Mon, 18 Jun 2012 08:59:36 -0700 Message-ID: From: VDR User To: Dieter BSD Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Mailman-Approved-At: Mon, 18 Jun 2012 17:07:55 +0000 Cc: freebsd-multimedia@freebsd.org, freebsd-hackers@freebsd.org Subject: Re: how to turn my computer into a TV X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Jun 2012 15:59:43 -0000 On Sun, Jun 17, 2012 at 6:31 PM, Dieter BSD wrote: > [ Added multimedia@ as that is a more appropriate list than hackers ] > >> I just moved into a very cramped apartment >> we are using a broadcast signal only [current US {NYC} standards] > > Recording ATSC takes very little CPU. =C2=A0Recording NTSC takes either > a lot of CPU or hardware compression. =C2=A0Decoding either takes a lot o= f CPU > (or hardware decoding which AFAIK FreeBSD doesn't have). You can use > at(1) for automated recordings. =C2=A0A full ATSC channel is 19.3 Mbps. > Some tuners allow filtering by PID, which saves disk space. 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. The broadcast streams are digital so when you "record" them, you are actually just saving the stream to some type of media (usually a harddrive). It's like saving a file where the file contents is audio/video, and it takes however long your show/timer/etc is. The only impact on the cpu is the same impact you have when you save any big file -- very little on any modern cpu. 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.