ffmpeg at half speed ... sort of.

[Paul Chvostek]

On Mon, Feb 07, 2005 at 10:05:21AM +0000, Steve O'Hara-Smith wrote:
> Paul Chvostek <paul+fbsd at 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 at it.ca>
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