Webcams: Difference between revisions
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(Office webcam feed is no longer available) |
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The live webcam feed of the office is no longer available. |
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See the previous history of this page for historical information about the webcam feed. |
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== Operation == |
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We use [http://www.lavrsen.dk/twiki/bin/view/Motion/WebHome Motion] to serve this webcam feed. It uses video4linux to read from the webcam, and pushes frames to the client (who maintains an HTTP connection). Frames are pushed when a certain amount of motion has detected, or a set maximum amount of time has passed since the last frame. One of these runs on each of our webcam hosts ([[Machine_List#maltodextrin|maltodextrin]] and [[Machine_List#bit-shifter|bit-shifter]]). Motion includes a builtin tiny HTTP server (running on port 8081 in our case) which serves a sequence of JPEG images to the browser. An ordinary <tt><img></tt> tag is embedded in the web page, and browsers will update the image when they receive a new one over the HTTP connection. |
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The Motion documentation is fairly self-explanatory, but here are the options we use for the webcam server part: |
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webcam_port 8081 |
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webcam_quality 30 |
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webcam_motion on |
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webcam_maxrate 5 |
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webcam_localhost off |
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webcam_limit 1000 |
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We also have a couple of udev rules to map the camera devices to a constant location and to disable any on-camera mice. These rules exist at /etc/udev/rules.d/99-csc-webcams.rules on the right machines. |
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=== maltodextrin cam === |
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# Create symlink for camera device at /dev/csc/malto-cam |
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SUBSYSTEMS=="usb", ATTRS{idVendor}=="046d", ATTRS{idProduct}=="0808", ATTRS{serial}=="714B8C60", ATTRS{bInterfaceClass}=="0e", SYMLINK+="csc/malto-cam", GROUP="motion" |
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# Disable the cam's mic |
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SUBSYSTEMS=="usb", ATTRS{idVendor}=="046d", ATTRS{idProduct}=="0808", ATTRS{serial}=="714B8C60", ATTRS{bInterfaceClass}=="01", ATTR{authorized}="0" |
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=== bit-shifter cam === |
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# Create symlink for camera device at /dev/csc/bitshifter-cam |
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SUBSYSTEM=="video4linux", SUBSYSTEMS=="usb", ATTRS{idVendor}=="046d", ATTRS{idProduct}=="082c", ATTRS{serial}=="AF2F2AD0", SYMLINK+="csc/bitshifter-cam", GROUP="motion" |
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== Webcam Counter == |
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Also known as the "implicit consent sign". The sign is connected via serial to bit-shifter. Associated scripts which update the counter are found in /opt/camcount/ on bit-shifter. |
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If the counter isn't working, /opt/camcount/daemon likely needs to be restarted. |
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== Hardware == |
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=== Logitech QuickCam Messenger === |
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* USB IDs: 046d:08da |
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* Kernel module: gspca (gspca-source) |
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* Max resolution: 640x480 |
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=== Logitech QuickCam Zoom === |
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* USB IDs: 046d:08b3 |
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* Kernel module: pwc |
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* Max resolution: 640x480 |
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=== Logitech QuickCam Web === |
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* USB IDs: 046d:0850 |
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* Kernel module: quickcam (qc-usb-source package) |
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* Max resolution: 480x360 |
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=== Logitech QuickCam Chat === |
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* USB IDs: 046d:092c |
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* Kernel module: gspca (gspca-source) |
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* Max resolution: 480x360 |
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[[Category:Hardware]] |
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Latest revision as of 14:48, 28 June 2016
The live webcam feed of the office is no longer available.
See the previous history of this page for historical information about the webcam feed.