Date: Wed, 9 Feb 2005 13:03:36 -0500 From: Paul Chvostek <paul+fbsd@it.ca> To: freebsd-multimedia@freebsd.org Subject: Re: ffmpeg at half speed ... sort of. Message-ID: <20050209180336.GA28606@it.ca> In-Reply-To: <20050207100521.544ed9bc.steve@sohara.org> References: <20050207032841.GA33816@it.ca> <20050207100521.544ed9bc.steve@sohara.org>
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On Mon, Feb 07, 2005 at 10:05:21AM +0000, Steve O'Hara-Smith wrote: > Paul Chvostek <paul+fbsd@it.ca> 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 <paul@it.ca> Operations / Abuse / Whatever it.canada, hosting and development http://www.it.ca/
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