def _run(self):
     # Uses subprocess to call the program for assembling frames into a
     # movie file.  *args* returns the sequence of command line arguments
     # from a few configuration options.
     command = self._args()
     if verbose.ge("debug"):
         output = sys.stdout
     else:
         output = subprocess.PIPE
     verbose.report("MovieWriter.run: running command: %s" % " ".join(command))
     self._proc = subprocess.Popen(command, shell=False, stdout=output, stderr=output, stdin=subprocess.PIPE)

 def _args(self):
     # Returns the command line parameters for subprocess to use
     # ffmpeg to create a movie using a pipe.
     args = [self.bin_path(), '-f', 'rawvideo', '-vcodec', 'rawvideo',
             '-s', '%dx%d' % self.frame_size, '-pix_fmt', self.frame_format,
             '-r', str(self.fps)]
     # Logging is quieted because subprocess.PIPE has limited buffer size.
     if not verbose.ge('debug'):
         args += ['-loglevel', 'quiet']
     args += ['-i', 'pipe:'] + self.output_args
     return args

 def _args(self):
     # Returns the command line parameters for subprocess to use
     # ffmpeg to create a movie using a pipe.
     args = [
         self.bin_path(),
         "-f",
         "rawvideo",
         "-vcodec",
         "rawvideo",
         "-s",
         "%dx%d" % self.frame_size,
         "-pix_fmt",
         self.frame_format,
         "-r",
         str(self.fps),
     ]
     # Logging is quieted because subprocess.PIPE has limited buffer size.
     if not verbose.ge("debug"):
         args += ["-loglevel", "quiet"]
     args += ["-i", "pipe:"] + self.output_args
     return args