-------------------------------
Alejandro Perretta
Overlink Soluciones Informaticas
http://www.overlink.net.ar
alejandro@xxxxxxxxxxxxxxx
Tel. 47998705
Cel. 1556233713
"Linux a way of life"
-------------------------------
"Computers are like air conditioners.
They stop working when you open Windows."
On Tue, 5 Aug 2003, Billy Biggs wrote:
> Tuukka Toivonen (tuukkat@xxxxxxxxxx):
>
> > On Tue, 5 Aug 2003, Gerd Knorr wrote:
> >
> > >gstreamer IMHO is overkill just for doing conversions.
> > >
> > >IMHO it would be better to put that into a small library which has
> > >just the conversion functions and nothing else.
> >
> > I don't think so: in a generic plugin system, parts of the driver could be
> > moved into userspace plugins.
> >
> > It's not just format conversion: there certainly is/will be hardware that
> > needs complex image processing and filtering for the incoming video, and
> > likely some features computed from the video image need to be fed back to
> > the driver to control the camera.
> >
> > For example, I get mjpeg-compressed video from the camera that I need to
> > uncompress and compute the image brightness. The brightness then controls
> > the camera exposure time. Another example: automatic focus control.
> >
> > Besides, users have asked me to implement things like flipping image upside
> > down in the driver, because they have mounted the camera into ceiling or
> > something. With a proper plugin system, this should be possible with all
> > video applications by just editing ~/.gstreamer.conf or something to tell
> > the pipeline that "insert somewhere a flip plugin".
> >
> > So I think that a big complex plugin system is needed, hopefully
> > Gstreamer.
>
> Regardless of whether the gstreamer idea is worth doing, the huge
> problem now is that there is no userspace code to just do the simple
> work of handling decompression for webcams that only offer images in odd
> compressed formats. Something as simple as this could get widea
> acceptance and solve much of our current problems.
>
> -Billy
>
>
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