<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def reset(self):
 """ Reset the videostream by restarting ffmpeg """


        if self.ffmpeg_process is not None:
            # Close the previous stream
            try:
                self.ffmpeg_process.send_signal(signal.SIGINT)
            except OSError:
                pass

        command = []
        command.extend([
            self.ffmpeg_binary,
            '-loglevel', 'verbose',
            '-y',       # overwrite previous file/stream
            # '-re',    # native frame-rate
            '-analyzeduration', '1',
            '-f', 'rawvideo',
            '-r', '%d' % self.fps,  # set a fixed frame rate
            '-vcodec', 'rawvideo',
            # size of one frame
            '-s', '%dx%d' % (self.width, self.height),
            '-pix_fmt', 'rgb24',  # The input are raw bytes
            '-thread_queue_size', '1024',
            '-i', '/tmp/videopipe',  # The input comes from a pipe

            # Twitch needs to receive sound in their streams!
            # '-an',            # Tells FFMPEG not to expect any audio
        ])
        if self.audio_enabled:
            command.extend([
                '-ar', '%d' % AUDIORATE,
                '-ac', '2',
                '-f', 's16le',
                '-thread_queue_size', '1024',
                '-i', '/tmp/audiopipe'
            ])
        else:
            command.extend([
                '-ar', '8000',
                '-ac', '1',
                '-f', 's16le',
                '-i', '/dev/zero',  # silence alternative, works forever
                # '-i','http://stream1.radiostyle.ru:8001/tunguska',
                # '-filter_complex',
                # '[0:1][1:0]amix=inputs=2:duration=first[all_audio]'
            ])
        command.extend([
            # VIDEO CODEC PARAMETERS
            '-vcodec', 'libx264',
            '-r', '%d' % self.fps,
            '-b:v', '3000k',
            '-s', '%dx%d' % (self.width, self.height),
            '-preset', 'faster', '-tune', 'zerolatency',
            '-crf', '23',
            '-pix_fmt', 'yuv420p',
            # '-force_key_frames', r'expr:gte(t,n_forced*2)',
            '-minrate', '3000k', '-maxrate', '3000k',
            '-bufsize', '12000k',
            '-g', '60',     # key frame distance
            '-keyint_min', '1',
            # '-filter:v "setpts=0.25*PTS"'
            # '-vsync','passthrough',

            # AUDIO CODEC PARAMETERS
            '-acodec', 'libmp3lame', '-ar', '44100', '-b:a', '160k',
            # '-bufsize', '8192k',
            '-ac', '1',
            # '-acodec', 'aac', '-strict', 'experimental',
            # '-ab', '128k', '-ar', '44100', '-ac', '1',
            # '-async','44100',
            # '-filter_complex', 'asplit', #for audio sync?

            # STORE THE VIDEO PARAMETERS
            # '-vcodec', 'libx264', '-s', '%dx%d'%(width, height),
            # '-preset', 'libx264-fast',
            # 'my_output_videofile2.avi'

            # MAP THE STREAMS
            # use only video from first input and only audio from second
            '-map', '0:v', '-map', '1:a',

            # NUMBER OF THREADS
            '-threads', '2',

            # STREAM TO TWITCH
            '-f', 'flv', 'rtmp://live-ams.twitch.tv/app/%s' %
            self.twitch_stream_key
            ])

        devnullpipe = open("/dev/null", "w")     # Throw away stream
        if self.verbose:
            devnullpipe = None
        self.ffmpeg_process = subprocess.Popen(
            command,
            stdin=subprocess.PIPE,
            stderr=devnullpipe,
            stdout=devnullpipe)