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Video

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Introduction

Many people want to use the bug device for making videos, unfortunately for now there is no shiping bug-cam. But still...an external webcam can be used such as a gspca or an uvc webcam. Both driver exist the kernel source that the bug device uses(but may not be compiled by default).

In the future Angstrom-based image will start to appear and to be usable.

Angstrom

This part depends on having angstrom: Get an angstrom image with:

  • a bug device kernel with your webcam driver
  • some installable gstreamer or mplayer packages

Once you have it running do: 

opkg update
opkg install gst-plugin-video4linux2
opkg install gst-plugin-avi


Gstreamer

Then here's the command for making a video with a gspca based webcam: 

gst-launch v4l2src device=/dev/v4l/video1 ! videorate ! image/jpeg ,framerate=25/1 ! avimux ! filesink location=video1.avi

And here's the same command for an uvc based webcam: 

gst-launch v4l2src device=/dev/v4l/video1 ! videorate ! avimux ! filesink location=video1.avi

we should note that:

  • /dev/v4l/video0 is a device node for the bug-cam so your webcam will be /dev/v4l/video1
  • it will erase any video named video1.avi
  • The cpu usage is pretty low(less than 50% with htop,enlightenment running)

streaming With gspca

On Bug device trough usb 

gst-launch v4l2src device=/dev/v4l/video1 ! videorate ! image/jpeg ,framerate=25/1 ! udpsink host=10.10.10.1 port=5000

Or trough wifi: 

gst-launch v4l2src device=/dev/v4l/video1 ! videorate ! image/jpeg ,framerate=25/1,width=320,height=240 ! udpsink host=ip_of_client_computer port=5000

On receiving computer: 

gst-launch-0.10 udpsrc port=5000 ! jpegdec ! xvimagesink

Mplayer

Here's the command for viewing the output of the webcam on mplayer 

export DISPLAY=:0.0
mplayer -fs mplayer tv:// -tv device=/dev/v4l/video1:driver=v4l2:width=320:height=240 -fps 25 -fs

Settings

If gstreamer is used,camera settings must be set separately,using another application.

http://www.vanheusden.com/dov4l2/ seem simple to cross-compile ( an oe_runmake under the devshell compiled it )

Note that mplayer seem to set its own settings for the camera,so if you want to use an external program to set settings,do it after that mplayer started

Here's an example of use: 

./dov4l2 -d /dev/v4l/video1 -w Brightness -a write -z 255
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