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The problem is that I can not exit the while loop without stopping the entire program.

When I execute the code on my Raspberry Pi, the camera starts recording, but when I want to end the video and press Ctrl+c, the entire program stops instead of continuing after the while loop. I thought the signal handler would catch the keyboard interrupt but it does not.

My code:

import picamera import signal from time import sleep from subprocess import call def signal_handler(signal, frame): global interrupted interrupted = True signal.signal(signal.SIGINT, signal_handler) interrupted = False # Setup the camera with picamera.PiCamera() as camera: camera.resolution = (1640, 922) camera.framerate = 30 # Start recording camera.start_recording("pythonVideo.h264") while True: sleep(0.5) print("still recording") if interrupted: print("Ctrl+C pressed") camera.stop_recording() break # Stop recording #camera.stop_recording() # The camera is now closed. print("We are going to convert the video.") # Define the command we want to execute. command = "MP4Box -add pythonVideo.h264 convertedVideo.mp4 -fps 30" #Execute command. call([command], shell=True) # Video converted. print("Video converted.")

What I tried:

bflag = True while bflag ==True: sleep(0.5) print("still recording") if interrupted: print("Ctrl+C pressed") camera.stop_recording() bflag = False

Error:

pi@raspberrypi:~/Documents/useThisFolder $ python cookieVideo.py still recording still recording still recording still recording still recording ^Cstill recording Ctrl+C pressed Traceback (most recent call last): File "cookieVideo.py", line 29, in <module> camera.stop_recording() File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 1193, in stop_recording 'port %d' % splitter_port) picamera.exc.PiCameraNotRecording: There is no recording in progress on port 1
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  • replace the "while True" with while somevar, and change this variable to False when you want to exit the loop Commented Jun 14, 2017 at 20:38
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    There is no need for things like "Disclaimer: Absolute noob attempting to explain a question.". The onus of asking a proper question is on you regardless of status, and trust me when I say noobishness will show if it's there. No need to apologize for it, just take the time to listen and learn. Commented Jun 14, 2017 at 20:40

2 Answers 2

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4

This would do it:

while True: try: sleep(0.5) print("still recording") except KeyboardInterrupt: print("Ctrl+C pressed") camera.stop_recording() break
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6 Comments

Thank you. However, when I implement your solution, ctrl+c does nothing. The while loop keeps going.
You need this code instead of the signal handler stuff.
If I use this code instead, I get the error mentioned in the problem description.
Ah, this needs to be within the with picamera.PiCamera() as camera block. I suspect recording stops automatically when you leave that block.
It is fixed. It was an indentation problem. I needed to use 4 spaces instead of tabs, because I am modifying the code using nano (I think that is the reason, don't know for sure). Thank you.
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enter image description here

As you can see it works perfectly with @mdurant's code.

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2 Comments

When I try this it gives an error, which I added to the question description.
The code provided by @mdurant works perfectly for me, try it again and see that your indentation is correct.

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