Stop an ffmpeg process

Would be great to see an implementation of a class method to kill the process gracefully (with ‘q’).

I´m trying to stop the ffmpeg process by killing it with SIGINT. Here is a stripped down code of my threading class:

    def is_process_running(self, process_name):
        p = subprocess.Popen(['ps', '-A'], stdout=subprocess.PIPE)
        out, err = p.communicate()    

        for line in out.splitlines():
            if bytes(process_name, 'utf-8') in line:
                pid = line.split()[0]
                return pid
        return False

    def kill_process(self):
        logger.info('Stopping FFMPEG')
        proc = is_process_running('ffmpeg')
        if proc:
            os.kill(proc, signal.SIGINT)

Here is the traceback:

Exiting normally, received signal 2.
Exception in thread ffmpeg-thread:
Traceback (most recent call last):
  File "/usr/local/Cellar/python3/3.5.2_1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/threading.py", line 914, in _bootstrap_inner
    self.run()
  File "observer.py", line 45, in run
    self.ff_stream.run()
  File "/Users/levy/Code/streampimp/venv/lib/python3.5/site-packages/ffmpy.py", line 104, in run
    raise FFRuntimeError(self.cmd, ff_command.returncode, out[0], out[1])
ffmpy.FFRuntimeError: `ffmpeg -re -i [the-input-output-parameters]` exited with status 255

I´m curious to know how you are dealing with stopping ffmpeg. Note that I´m running ffmpeg in a separate thread.

[Ch00k]

@busla I made this change in version 0.2.2. You can now call terminate() on FFmpeg.process from another thread to terminate the process forcefully.

[L05]

Was able to use the above suggestions to make this work for me:

import ffmpy
import time
from threading import Thread
import subprocess

ff = ffmpy.FFmpeg(
    inputs={'in.mp4': None},
    outputs={'out.mp4' : '-t 10'}
)

def execute():
    try:
        ff.run(input_data=subprocess.PIPE)
    except ffmpy.FFRuntimeError as ex:
        if ex.exit_code and ex.exit_code != 255:
            raise
    return

if __name__ == '__main__':
    process = Thread(target=execute)
    process.start()
    time.sleep(7)
    ff.process.communicate(str.encode('q'))

You need to pass input_data=subprocess.PIPE into run() so that you can send the encoded ‘q’ keystroke later on.