maemo.org - Talk - N900 as USB Webcam?

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N900 as USB Webcam?

Does anyone know if it's possible to use the N900 front camera as a usb webcam for Skype. I've had a quick look around but people are talking about wireless streaming which i want to avoid if possible (cos it's far to complicated for me)
Just want simple usb webcam mode?:confused:

Re: N900 as USB Webcam?

Nothings been made like that yet I'm afraid. You could try the network based ones like livecast.

Re: N900 as USB Webcam?

interested in this too. looked it up a few months ago but nothing came up. ill keep a watch on this thread in hopes of good news.

Re: N900 as USB Webcam?

Here's a strategy I tried to do but gave up on:

1. Stream cam's video over IP via gstreamer (many examples if you search)
2. On laptop create a "Virtual Camera" (a webcam identified by the laptop/pc) that captures this stream.
3. Use skype, gtalk etc... which would connect to your virtual camera and take the feed from there.

I was able to do the first, the second step is tricky...

Hope this helps.

Re: N900 as USB Webcam?

Can you post some examples of gstreamer over IP as I have tried all the ones I could find from google and not had a lot of success with them.

Re: N900 as USB Webcam?

i managed to get the n900 to stream a selection of jpg images to my PC, and got the PC to interpret that as a webcam (using someone elses drivers).

I never got a chance to swap the list of jpgs for a gstreamer stream but it shouldn't be too difficult...

Re: N900 as USB Webcam?

i remember that i once had coneted a v4l device via Network to a windows device directly as twain input. No gstreamer, the device it self was adressed.
As far as i remember it was tricky and i never got it to work perfect (packetdrop was fatal as far as i remember)

Re: N900 as USB Webcam?

I am able to take videocall to sip:500@ekiga.net
It is an echo test, so your audio and video (from the front camera) is routed back to you.

Seems like videocalling is working, when *bad* proprietary (Skype) standards are not used.

Re: N900 as USB Webcam?

Quote:

Originally Posted by Alex Atkin UK (Post 836183)

Can you post some examples of gstreamer over IP as I have tried all the ones I could find from google and not had a lot of success with them.

http://blog.pclewis.com/2010/02/stre...camera-to-vlc/

works for me.

Re: N900 as USB Webcam?

Quote:

Originally Posted by Alex Atkin UK (Post 836183)

Can you post some examples of gstreamer over IP as I have tried all the ones I could find from google and not had a lot of success with them.

I have been using this:

Code:

#Server

gst-launch v4l2src device=/dev/video0 ! videoscale! video/x-raw-yuv,width=320,height=240 ! ffmpegcolorspace ! jpegenc ! multipartmux ! tcpserversink host=10.0.0.240 port=5000

#Client

gst-launch tcpclientsrc host=10.0.0.240 port=5000 ! multipartdemux ! jpegdec ! autovideosink

Some distributions have gst-launch named gst-launch-0.10.

But to use it as web-camera, you need to create virtual v4l2-device from it afaik, but I couldn't manage to get it working:

Code:

$ gst-launch tcpclientsrc host=10.0.0.240 port=5000 ! multipartdemux ! jpegdec ! v4l2sink device=/dev/video0

Setting pipeline to PAUSED ...

ERROR: Pipeline doesn't want to pause.

ERROR: from element /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0: Cannot identify device '/dev/video0'.

Additional debug info:

v4l2_calls.c(488): gst_v4l2_open (): /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0:

system error: No such file or directory

Setting pipeline to NULL ...

Freeing pipeline ...

$

Re: N900 as USB Webcam?

Create a stream to VLC using this : http://blog.pclewis.com/2010/02/stre...camera-to-vlc/

and then using Manycam (windows) to create a virtual webcam using a part of the screen (which is your VLC window)

The first part will work for Linux to but i don' t think there is manycam for Linux.

Not the best way, but it works

Re: N900 as USB Webcam?

Trying this now... On Nokia N900, a script containing:
gst-launch v4l2camsrc device=/dev/video0 ! dsph264enc ! rtph264pay ! udpsink host=LaptopTargetIP port=5434
or
gst-launch v4l2camsrc device=/dev/video0 ! ffmpegcolorspace ! jpegenc ! multipartmux ! udpsink host=LaptopTargetIP port=5434

On laptop, installing v4l2loopback with module-assistant, to perform
sudo modprobe v4l2loopback
And then something like
gst-launch udpsrc ! decodebin ! v4l2sink device=/dev/video0
or
gst-launch udpsrc ! multipartdemux ! jpegdec ! decodebin ! v4l2sink device=/dev/video0

So far, problem is, libv4l2: error getting pixformat: Invalid argument

And dummy camera on laptop is black.

Thank you. Best wishes.
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