Issue Description
I use the tool rs-convert to get png files from a bag file.
But every times I start the program it doesn't terminate. I launch the program from a terminal in Ubuntu 16.04, so to terminate it, I must press the combination of keys Ctrl-C.

I add a screenshot which shows the execution end of the tool. In this case, it extracts frames from the bag file called: 20190220_145430_880.bag.

The screenshot shows that rs-convert extract 45 frame from the bag file:

On the bottom-left of the screenshot it's visible the blinking cursor.
To close the application I need to press Ctrl+C.

I need to use the code of the rs-convert tool to create an analog application which extract png files from a bag files.
So I can't accept that the execution of this application doesn't terminate!

Someone have the same problem or can help me about this trouble?

Thank you
Frank