FlytSim : Snapshot


#1

Hello,

I am getting the default image for the video stream : topic=/iris/camera/camera_1/image_raw
but i am not getting the image for steam : topic=/flytsim/flytcam/image_capture

Can you explain me what the difference between these two stream topics and which stream should we use to get snapshot from flytsim.

Thanks.


#2

Hi Pratik,

the video stream : topic=/iris/camera/camera_1/image_raw ----> is specific to FlytSim
the video stream : topic=/flytsim/flytcam/image_capture ----> is the stream which is irrespective of whether you run on FlytSim or actual vehicle.
Hence, for all generic cases you must subscribe to topic=/flytsim/flytcam/image_capture.

But to get this stream, you must have OpenCV installed. It would be good if you install OpenCV 2.4.10 in your own system.


#3

Hi Srv,

I have installed OpenCV 2.4.10 and checked its sample example its working fine.

Now I have started the flytsim and given the command to take off the drone to 3.0 height its also worked perfectly fine.

But when I have fire the snapshot api using the topic /flytsim/flytcam/image_capture, I doesn’t get any response. I don’t understand what is going wrong.

Is FlytSim provides the snapshot when we call the snapshot api or not?

Thanks.


#4

Is the snapshot API working for the other topic: /iris/camera/camera_1/image_raw ?
Moreover have you tested video streaming yet?
Also could you post the URL that you are using for capturing snapshots.


#5

Hi,

Yes the screen shot api works for topic =/iris/camera/camera_1/image_raw
Here is the url and also the screen shot:
10.0.1.12:8080/snapshot?topic=/i … quality=90

The video streaming api is working fine. Below is the url gives two stream topic
10.0.1.12:8080/list_streams

Thanks



#6

What is your version of installed OpenCV? We only support OpenCV 2.4. If you have installed OpenCV 3, then that would be an issue.

Moreover, instead of simply checking the list, try starting the video stream.
http://"++":8080/stream?topic=/flytsim/flytcam/image_capture&width=320&height=240&rate=2


#7

Hi,

I have install the OpenCV 2.4 as per suggested.

When I call the api given by you for starting the video from the browser it shows mean connecting…
nothing happening further.


#8

Hi,

I have install the OpenCV 2.4 as per suggested.

When I call the api given by you for starting the video from the browser it shows mean connecting…
nothing happening further.


#9
  1. Have you tried the same video streaming API with the other topic? Is it not streaming as well?
  2. No a different note, when you start FlytSim using the launch script, do you notice any error popping up ?
  3. Also, in your terminal run this command:

rostopic echo /flytsim/flytcam/image_capture and check whether any data is printed or not? If not, then complete the Step 2 religiously and post your results.


#10

Hi,
I have try the same video stream api with other topic but it does not give any response.

When I run the command provided by you in the terminal, I got the below message

WARNING: no messages received and simulated time is active.
Is /clock being published?


#11

What were the results of Step 2?
Moreover, try this command:

If the above command also returns:
WARNING: no messages received and simulated time is active.
Is /clock being published?

Then please post the results of Step 2.


#12

Hi,

When i execute the second command I got the below result

, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 178, 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And when I execute the first command I didn’t get any result.


#13

Hi,
When observe the commands in the terminal after starting the flytsim I found the below mesage

Warning [Converter.cc:59] Version[1.5] to Version[1.4]
Please use the gzsdf tool to update your SDF files.
$ gzsdf convert [sdf_file]
Error [Converter.cc:127] Unable to convert from SDF version 1.5 to 1.4


#14

Hello,

Please provide me the solution of the problem regarding video streaming snapshot api.

Thanks


#15

Hello,

I call the start video stream api from the browser using HTTP Requester add on of firefox. I don’t know whether the video streaming has been started or not. And if it is started then how we get the snapshot.

Below is the screen shot:



#16

Hi Pratik,

Try this and let us know:
Once you have successfully launched flytos in sitl (FlytSim), go to http://:8080 in a browser.
You will see list showing Available ROS Image Topics
Click on the links to get corresponding video stream or snapshot.
If this works, corresponding URL (in browser after clicking link) should help you.
If it doesn’t work, there is some problem so report back.

cheers


#17

Hi,

When i call the ip:8080 in the browser I got two ROS avaialable topic. On Click of first topic i got a default grey image, but on click on the second topic I didn’t get any respond. So what is miss to get the image or video for second topic.
Below are the screen shots:

Thanks.







#18

Hi,

It doesn’t look like you are getting even the first topic correctly. The second topic is copy of first and will be available only if first is getting updated. I am attaching screen shot of how the image_raw should look. You need to check if FlytSim is getting launched on your server correctly and you are able to see drone and environment in simulation. Also, give command for take off so that you can see some objects in the video stream and snapshot (grey image isn’t helpful).


cheers


#19

Hi,

In FlytSim, the drone is already take off at 3.0 height, and when I call the first topic from the browser the following commands is executed in the command line :

[ INFO] [1461315883.908815912, 14447.810000000]: Handling Request: /snapshot?topic=/iris/camera/camera_1/image_raw
[ INFO] [1461315884.579559272, 14448.470000000]: Removed Stream: /iris/camera/camera_1/image_raw

I think the flytsim is launched correctly but didn’t understand what is the issue.

Thanks.


#20

Hello,

Can you please provide me the solution of the previous posted queries regarding the snapshot apis.

Thanks.