Killing subprocess that is running Gstreamer

Question

I am using a Jetson Nano and the idea is the run a video when a button is pushed. Which I have working currently by waiting for a button push event and then running a shell script using subprocess.call() to call a shell script I wrote that contains gstreamer command to run the video.

My next objective is to be able to stop the video, even mid-video, if the button is pushed. Doing some research (aka searching stackoverflow), it seems the best way to stop gstreamer video is to tell the pipeline to terminate. Going off of what I found, my code is essentially as follows:

import subprocess

p = subprocess.Popen("./open-video.sh")
time.sleep(2)
p.kill()

Which doesn't stop the video, other variations I've tried are as follows (none have worked):

import subprocess, os
import signal

p = subprocess.Popen("./open-video.sh")
time.sleep(2)
os.kill(p.pid, signal.SIGINT)

import subprocess
p = subprocess.call("./open-video.sh")
p.kill()

The contents of open-video.sh :

gst-launch-1.0 filesrc location=CES_AE_3D.mp4 ! qtdemux name=demux ! h264parse ! omxh264dec ! nvoverlaysink -e

Thanks for reading.

Answer 1

Kill the gst-launch-1.0 process instead of the script running the gst-launch-1.0 process. You need to get the pid that is created when your shell script is executed.