[Ffmpeg-devel] Re: Problems encoding H264 with a MP4 / MOV container with ffmpeg

[Erik Slagter]

On Fri, 2005-06-17 at 09:38 -0700, Bill May wrote:

> >>Thanks to ffmpeg and x264, mpeg4ip can encode and record/stream live
> >>v4l2 streams, and play it back, as well.
 
> > Very very nice! I guess you'll need a lot of cpu power (or a low
> > resolution) ;-)

> Actually, with x264, you do not need significantly more power than
> with ffmpeg - it's probably a factor of 2, rather than more than that.

Huh? ffmpeg is using x264 for h264 encoding. Or do you actually mean
mpeg4 here?

> With a dual, 2G machine, CIF is fine (about 50%), 640x480 starts to
> push it.  There's enough CPU to do multiple encodings of the same
> source (h.264, mpeg-4) at the same time.

On the complete same machine I can encode to mpeg4 720x576 in realtime
(+audio and filtering). Using h264 that goes down to 360x288 (x4
slowdown!), not quite usable. I hope that's not inherent to the encoder!