From owner-freebsd-multimedia@FreeBSD.ORG Wed Feb 9 18:03:37 2005 Return-Path: Delivered-To: freebsd-multimedia@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E70B716A4CE for ; Wed, 9 Feb 2005 18:03:37 +0000 (GMT) Received: from haggis.it.ca (haggis.it.ca [216.126.86.9]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7B3C543D2F for ; Wed, 9 Feb 2005 18:03:37 +0000 (GMT) (envelope-from paul@haggis.it.ca) Received: from haggis.it.ca (paul@localhost [127.0.0.1]) by haggis.it.ca (8.12.11/8.12.11) with ESMTP id j19I3aKZ000607 for ; Wed, 9 Feb 2005 13:03:36 -0500 (EST) (envelope-from paul@haggis.it.ca) Received: (from paul@localhost) by haggis.it.ca (8.12.11/8.12.6/Submit) id j19I3a4M000606 for freebsd-multimedia@freebsd.org; Wed, 9 Feb 2005 13:03:36 -0500 (EST) (envelope-from paul) Date: Wed, 9 Feb 2005 13:03:36 -0500 From: Paul Chvostek To: freebsd-multimedia@freebsd.org Message-ID: <20050209180336.GA28606@it.ca> References: <20050207032841.GA33816@it.ca> <20050207100521.544ed9bc.steve@sohara.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050207100521.544ed9bc.steve@sohara.org> User-Agent: Mutt/1.4.2.1i Subject: Re: ffmpeg at half speed ... sort of. X-BeenThere: freebsd-multimedia@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Multimedia discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Feb 2005 18:03:38 -0000 On Mon, Feb 07, 2005 at 10:05:21AM +0000, Steve O'Hara-Smith wrote: > Paul Chvostek wrote: > > > > This is weird. When I encode with ffmpeg, the resultant file appears to > > play back at about half the expected framerate, with the wrong bitrate. > > > > I encode with ffmpeg: > > > > encode$ ffmpeg -y -an -vd /dev/bktr0 -s 160-120 -tvstd ntsc \ > > -vcodec mpeg4 -b 50 -f avi -t 15 -r 29.97 test.avi > > -b 50 is a video bandwidth of 50 Kbit/s which is rather low, try > leaving it out (to get the default 200 Kbit/s) or setting it higher. It > may well be that ffmpeg isn't achieving as much compression as you had > been hoping for. Yeah, the -b 50 was just for testing. It's not too bad at 160x120. But I get the same behaviour (slow framerate, crawling playback) that I see at higher bitrates as well. > Also what sort of CPU are you using ? % grep CPU: /var/run/dmesg.boot CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (2992.51-MHz 686-class CPU) Thanks. -- Paul Chvostek Operations / Abuse / Whatever it.canada, hosting and development http://www.it.ca/