URL for MjpegServer from CameraServer/USB Camera

[dmelcer9]

I'm looking to use a USB camera connected to the robot for GRIP development. I know that GRIP doesn't accept the dashboard stream, but the MJPG stream supposedly works. However, I can't figure out what URL to point GRIP to if I want to actually use the stream.

Currently, our code looks something like this (forgot to commit to github so don't have the exact code):

//Robot.java -> RobotInit

UsbCamera c = CameraServer.getInstance().startAutomaticCapture();
MjpegServer s = CameraServer.getInstance().addServer("gripStream");
s.setSource(c);

What URL would I point the "Add IP Camera" source to in GRIP to get the camera to work properly?

[Thad House]

Originally Posted by dmelcer9

I'm looking to use a USB camera connected to the robot for GRIP development. I know that GRIP doesn't accept the dashboard stream, but the MJPG stream supposedly works. However, I can't figure out what URL to point GRIP to if I want to actually use the stream.

Currently, our code looks something like this (forgot to commit to github so don't have the exact code):

//Robot.java -> RobotInit

UsbCamera c = CameraServer.getInstance().startAutomaticCapture();
MjpegServer s = CameraServer.getInstance().addServer("gripStream");
s.setSource(c);

What URL would I point the "Add IP Camera" source to in GRIP to get the camera to work properly?

You actually don't need that MjpegServer definition or the setSource line. startAutomaticCapture will automatically create the stream.

The way to access the code from GRIP would be

http://roborio-TEAM-frc.local:1181/?action=stream

[dmelcer9]

Really? Thank you! I'm guessing any additional streams (for example if we have 2 cameras) would use port 1182? I saw some sort of reference to using the next available port.

[Thad House]

Originally Posted by dmelcer9

Really? Thank you! I'm guessing any additional streams (for example if we have 2 cameras) would use port 1182? I saw some sort of reference to using the next available port.

Yeah any additional cameras will just increase the port number, so cam 2 will use 1182, cam 3 will use 1183 etc...

[dmelcer9]

Thanks! Didn't get a chance to test until today (building was closed for bad weather) but it worked really nicely. One (hopefully) last question: is there any way to increase the resolution of the mjpg stream? Currently GRIP shows the stream as a tiny thumbnail which is workable but a little annoying.

[Thad House]

Originally Posted by dmelcer9

Thanks! Didn't get a chance to test until today (building was closed for bad weather) but it worked really nicely. One (hopefully) last question: is there any way to increase the resolution of the mjpg stream? Currently GRIP shows the stream as a tiny thumbnail which is workable but a little annoying.

When you call startAutomaticCapture, it will return a UsbCamera object. Call setResolution on that object, and that will set the resolution to whatever you put in.

[dmelcer9]

Thanks! Didn't know that the USBCamera object affected the stream like that. Good to know.

[ryan.mitchell]

What would the mjpegserver be if I am accessing the camera from a raspberry pi? Currently I am just typing raspberrypi.local:1185 into a browser to see the camera image but I would like to get it to appear on my smartdashboard.

[ryan.mitchell]

Originally Posted by ryan.mitchell

What would the mjpegserver be if I am accessing the camera from a raspberry pi? Currently I am just typing raspberrypi.local:1185 into a browser to see the camera image but I would like to get it to appear on my smartdashboard.

Oh wait...it should be the same thing just port 1185, I'll give that a go and relay how it goes.

[thecoopster20]

Originally Posted by ryan.mitchell

Oh wait...it should be the same thing just port 1185, I'll give that a go and relay how it goes.

Any success? I am on the same boat as you are currently.

[MuskieProgramme]

I would also like to know how to get the camera stream from the raspberry pi on the dashboard. Even better would be an unmodified Labview Dashboard, as nobody on my team is interested in using the other options. I'm fairly certain it is possible with the right things published to network tables, but who knows...

[ryan.mitchell]

Originally Posted by thecoopster20

Any success? I am on the same boat as you are currently.

Well, I'm upset...I hit submit post and it just went *poof*...anyway a rundown of my current situation is that it didn't work however I an idea that I just thought of which I will test tomorrow (and paste my code). I believe I have just been making a stupid mistake. As for MuskieProgrammes question, I would use the SmartDashboard definitely because I believe LabView can only handle Usbcameras, could be wrong though. Also, network tables can only publish/get variables (again, 99% positive).

Ryan