Date: Mon, 7 Feb 2005 10:05:21 +0000 From: Steve O'Hara-Smith <steve@sohara.org> To: freebsd-multimedia@freebsd.org Subject: Re: ffmpeg at half speed ... sort of. Message-ID: <20050207100521.544ed9bc.steve@sohara.org> In-Reply-To: <20050207032841.GA33816@it.ca> References: <20050207032841.GA33816@it.ca>
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On Sun, 6 Feb 2005 22:28:41 -0500
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.
Also what sort of CPU are you using ?
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