Le Mercredi 15 Novembre 2006 09:07, Pablo d'Angelo a écrit :
> Hi Vidar,
>
> > Hi,
> >
> > On 11/14/06, *Laurent Pinchart* <[EMAIL PROTECTED]
> > <mailto:[EMAIL PROTECTED]>> wrote:
> >
> > Except when asked for it :-) You're probably asking the webcam to
> > stream in
> > YUV format, and first generation hardware doesn't support low
> > resolutions in
> > YUV. You will have to set the format to MJPEG, or get a newer webcam
> > if you
> > absolutely need YUV at low resolutions.
> >
> >
> > I don't need YUV, I need it to work :)
> > How do I set it to stream in MJPEG-format?
>
> You could use luvcview
> http://mxhaard.free.fr/download.html
> which seems to offer the ability to create mjpeg avi files directly,
> without recoding, if I understood correctly.
>
> ciao
> Pablo
There are always a bandwith limit when asking video stream over usb pci agp
ide ... bus :) that is why a mjpeg hardware compressor in the webcam help,
but you loss some picture details. Setting a usb HCD per webcam give better
performance (a PCI to USB add on card is not very expensive) and allow
maximum frame rate on each webcam. Becare to remove all others usb device set
on the same usb bus, specially the low one (mouse keyboard...).
luvcview record the mjpeg stream in an avi container if needed, you can used
ffmpeg or transcode to change the video codec, I used xvid or h264 with very
good compression performance :)
regards
--
Michel Xhaard
http://mxhaard.free.fr
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