Webcams: Difference between revisions
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(how the webcam works (adapted from a syscom email in April)) |
(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]], though the latter isn't working most of the time). 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 <img> 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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== 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.