Le Mercredi 15 Novembre 2006 05:34, Vidar Normann a écrit :
> On 11/14/06, Laurent Pinchart <[EMAIL PROTECTED]> wrote:
> > > > > > The thing that I notice is the third last line, seems the
> >
> > v4l2-driver
> >
> > > > > > forces transfer in a 1024x576
> > > > > > resolution? Other than that, I have no idea and I don't know what
> >
> > to
> >
> > > > do.
> > > >
> > > > > That looks weird, indeed. The UVC driver doesn't do that, however.
> > > >
> > > > 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?
> >
> > Ask the ffmpeg developers :-) Sorry, but I can't help you there, I have
> > no experience with ffmpeg.
> >
> > Best regards,
> >
> > Laurent Pinchart
>
> Hi again :)
> As long as bandwidth is the only problem I should also be able to fix this
> problem by
> lowering the frames-per-second, right? When run in normal 24
> fps-mode,ffmpeg outputs
> this line (among others):
> Stream #0.0: Video: rawvideo, yuv422, 1024x576, 235929 kb/s, 25.00 fps(r)
>
> Yet if I run the recording with only 5 fps I get this:
> Stream #0.0: Video: rawvideo, yuv422, 1024x576, 47185 kb/s, 5.00 fps(r)
>
> If I am able to use 235929 in one go I should be able to record 2 times
> 47185 easily, right?
> I keep getting the same error as before:
> ioctl(VIDIOC_STREAMON): No space left on device
> Could not find video grab device
>
> Haven't been able to find a way of setting capture method to MJPEG instead
> of YUV, but
> I'll keep looking although right now I'm not sure it'll help at all, seems
> there is something
> else causing this problem.
>
> Regards,
> Vidar Normann
Vidar,
Your error ENOSPC problem come from the alternate setting choice in the
driver. The best way is to used another Usb HCD (host controller device) from
the motherboard or set up a PCI to USB add on card. As rule i used one HCD
per webcam device to get the maximum performance :)
regards
--
Michel Xhaard
http://mxhaard.free.fr
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