Hi,

I am using the video_recorder to save a video stream to a file using ros.This is the command I am using :

rosrun image_view video_recorder image:=/camera/image_raw  _filename:="test.avi"

These are the messages in the terminal :

[ INFO] [1548243269.519044136]: Waiting for topic /camera/color/image_raw...
[ INFO] [1548243269.722238288]: Starting to record MJPG video at [640 x 480]@15fps. Press Ctrl+C to stop recording.
[ INFO] [1548243271.470604124]: Recording frame 52
 Video saved as output.avi

Now, I want to call the videorecorder via Launshing Topic "starttopic" ,So I tried to call this funcition via subprocess.Peopen like that :

cmd = rosrun image_view video_recorder image:=/camera/image_raw  _filename:="test.avi"
proc = subprocess.Popen(cmd, shell=True)

It works but I can't stop videorecorder. I want to stop recording via topic like the "starttopic".. I tried to kill the process ..use function subprocess.terminte() .. But it does not work.

Does anyone know what's wrong? Any Help to stop the record without tapping Ctr+C ?

 os.kill(proc.pid+1, signal.SIGTERM)