From owner-freebsd-multimedia@FreeBSD.ORG Sat Apr 15 05:53:07 2006 Return-Path: X-Original-To: freebsd-multimedia@freebsd.org 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 80F2016A400 for ; Sat, 15 Apr 2006 05:53:07 +0000 (UTC) (envelope-from joe@netmusician.org) Received: from netmusician.org (netmusician.org [209.67.223.75]) by mx1.FreeBSD.org (Postfix) with ESMTP id 255BB43D45 for ; Sat, 15 Apr 2006 05:53:07 +0000 (GMT) (envelope-from joe@netmusician.org) Received: from localhost (localhost [127.0.0.1]) by netmusician.org (Postfix) with ESMTP id B22CC7309A; Sat, 15 Apr 2006 01:53:06 -0400 (EDT) Received: from netmusician.org ([127.0.0.1]) by localhost (netmusician.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 40191-01; Sat, 15 Apr 2006 01:53:05 -0400 (EDT) Received: from [192.168.0.2] (12-223-193-72.client.insightbb.com [12.223.193.72]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by netmusician.org (Postfix) with ESMTP id 934DC73099; Sat, 15 Apr 2006 01:53:05 -0400 (EDT) In-Reply-To: References: <20060415051014.GA20238@puff.jakemsr.gom> Mime-Version: 1.0 (Apple Message framework v749.3) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <26EC8B9F-9627-4447-B20F-BF5743CBAEB8@netmusician.org> Content-Transfer-Encoding: 7bit From: Joe Auty Date: Sat, 15 Apr 2006 01:53:06 -0400 To: Joe Auty X-Mailer: Apple Mail (2.749.3) X-Virus-Scanned: by amavisd-new at netmusician.org Cc: freebsd-multimedia@freebsd.org Subject: Re: ffmpeg question 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: Sat, 15 Apr 2006 05:53:07 -0000 Okay, I think I figured this out.... almost: ffmpeg -i /dev/cxm0 -vcodec copy -acodec copy -t 20 test_ffmpeg.mpg Except doing this completely ignores my -t 20 and keeps on recording after 20 seconds... why is that? On Apr 15, 2006, at 1:14 AM, Joe Auty wrote: > > On Apr 15, 2006, at 1:10 AM, Jacob Meuser wrote: > >> On Fri, Apr 14, 2006 at 11:54:18PM -0400, Joe Auty wrote: >>> Hello, >>> >>> Doing a: >>> >>> cat /dev/cxm0 > myvideo.mpg >>> >>> produces great mpeg2 video... However: >>> >>> ffmpeg -i /dev/cxm0 -t 10 test_ffmpeg.mpg >>> >>> produces 10 seconds of mpeg1 video that doesn't look as good. >>> >>> >>> I've tried adding -f and -vcodec options with -s 640x480, >>> but I just can't seem to find something that will reproduce my raw >>> feed without errors, loss of picture, the size being off, or >>> reverting back to mpeg1. >>> >>> To save me a little further time in just random trial and error, can >>> anybody hook me up with the combination I need? >> >> sorry, but what exactly are you trying to do? what is lacking with >> the cat command? >> >> most likely, if you are running a transcoder (like ffmpeg, mencoder >> or transcode), it is decoding the input into raw YUV or RGB and then >> back to MPEG. this is a lossy and time/cpu consuming process. >> > > The cat command works perfectly, but I'm trying to script it, and > since you can use ffmpeg to specify how many seconds of footage to > capture I'm trying to make this work. > > According to Quicktime's Get Info, the cat files are mpeg2... I'd > like to know the best way to preserve the same quality from the cat > command using ffmpeg. > > Am I starting to make sense now? > > > _______________________________________________ > freebsd-multimedia@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-multimedia > To unsubscribe, send any mail to "freebsd-multimedia- > unsubscribe@freebsd.org"