Different fps for video and preview output

[saching13]

Is it possible to modify the code such that the frame rates for video and preview output are different? I'm using the camera on a resource contraint platform and want to lower the computational burden. As an example I would like to have 30 fps for the preview output and 2 fps for the video output.

Alternatively, could there be a ROS service to capture still images at the full sensor resolution?

Moving from here

[saching13]

cc: @alexswerner

[saching13]

@alexswerner Yes. that should be possible. Either you can create a script node and pass the video output to throttle and send at 2fps. Or you can use throttle tools like this Or like you mentioned you can also have a action or service to make it capture at full res.

[alexswerner]

Just got back to this. Thanks for the reply. When you write script node, you mean a python script which republishes the messages at a lower rate? I'm not sure if that would serve the purpose of reducing the computational (i/o) burden on the cpu as the camera whould then still transfer the full-size images at full rate. Or am I mistaken?