[MPlayer-users] v4l documentation

[Emmanuel Anne]

On Mon, 28 Oct 2002, Jindrich Makovicka wrote:

> >1) outfmt is not detected with my card, I have to force it (rgb16,
> >rgb24, rgb32 and yuy2 are working...). Maybe it's related to the kernel
> >driver, but maybe it should be mentioned...
> >
> what driver do you exactly use?

Zoran.
 
> >3) My cpu is not fast enough to encode with such parameters !!! I know
> >it's not directly related to mplayer, but do you have any suggestions
> >for some faster video codec (which is not mjpeg) ? The cpu is a p3-1Ghz
> >by the way.
> >
> It depends on the memory bandwith, too. My machine is a Duron 
> overclocked to 960MHz(138MHz FSB), with 266MHz DDR ram and i have CPU 
> load floating ~ 85%. If you really have to specify another outfmt than 
> YV12 of I420, your cpu is wasting a lot of cpu cycles converting to YV12.
 
Wow, 266 Mhz for the ram with a duron 900 !!! I didn't know it was
possible, I thought these speeds were only for the latest 1700+ and
such. Thanks for the info, I'll take the time to test EVERY outfmt then!

> >Except these little details, this piece of doc is most usefull,
> >especially the part about interlacing (I thought interlacing was only
> >relevant for ntsc, excuse me !).
> >
> NTSC is even much worse than PAL. Just read something about so-called 
> "Telecine" which is a technique of getting 24FPS movie displayed thru 
> 29.97FPS interlaced video. Compared to this, deinterlacing a PAL video 
> is a piece of cake :)

Yes, I have heard of it while playing with the mjpegtools.
Thanks again !
 
> Regards,
> 
> -- 
> Jindrich Makovicka