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WaltonRobotics / OutreachBots

Code developed for the initial chassis with the 2015 FRC Control System
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Camera Bandwidth #11

Open EpicPi opened 9 years ago

EpicPi commented 9 years ago

Camera may take too much bandwidth if we do not compress the images before we send them to the smart dash.

TheBassett commented 9 years ago

Here is a chart I used in 2013 to determine what was acceptable for camera settings and bandwidth. a7_compression chart

The FMS network only allows 7 mbits/s to each team and ~1 of those is used just by the DS communication. Simple math means you have 6 mbits/s left (I wouldn't try to hit that limit, I'd try and stay at 4 typically and maybe 5 or 6 at peaks). Here is what I artfully annotated from 2013 to help you guys: a8_compression preferences

Note that although those are the listed bandwidths, I was able to get well below those when I adjusted the settings on the camera so it basically was only showing black and lights/retroreflective tape - that is a really simple image to compress and because it has little colors in big chunks, it also compresses a lot.

timstanistreet commented 9 years ago

Looks like the CameraServer class has appropriate methods to set this detail. Looks like you need to experiment a little!

Can RoboRealm see the image from SmartDashboard? It's slightly different to how we used to connect with the Axis cam in previous years!

On Sun, Jan 18, 2015 at 3:39 PM, TheBassett notifications@github.com wrote:

Here is a chart I used in 2013 to determine what was acceptable for camera settings and bandwidth. [image: a7_compression chart] https://cloud.githubusercontent.com/assets/7651738/5793951/513f7160-9f27-11e4-9a92-a93fc8647ec9.JPG

The FMS network only allows 7 mbits/s to each team and ~1 of those is used just by the DS communication. Simple math means you have 6 mbits/s left (I wouldn't try to hit that limit, I'd try and stay at 4 typically and maybe 5 or 6 at peaks). Here is what I artfully annotated from 2013 to help you guys: [image: a8_compression preferences] https://cloud.githubusercontent.com/assets/7651738/5793952/513fddda-9f27-11e4-8e5f-6444f2b94e1d.JPG

Note that although those are the listed bandwidths, I was able to get well below those when I adjusted the settings on the camera so it basically was only showing black and lights/retroreflective tape - that is a really simple image to compress and because it has little colors in big chunks, it also compresses a lot.

— Reply to this email directly or view it on GitHub https://github.com/WaltonRobotics/TestBot/issues/11#issuecomment-70424789 .