Split a couple of lines to make the code more readable

youtube-dl

@@ -2620,8 +2620,8 @@ class FFmpegExtractAudioPP(PostProcessor):
 	@staticmethod
 	def get_audio_codec(path):
 		try:
-			handle = subprocess.Popen(['ffprobe', '-show_streams', '--', path],
-					stderr=file(os.path.devnull, 'w'), stdout=subprocess.PIPE)
+			cmd = ['ffprobe', '-show_streams', '--', path]
+			handle = subprocess.Popen(cmd, stderr=file(os.path.devnull, 'w'), stdout=subprocess.PIPE)
 			output = handle.communicate()[0]
 			if handle.wait() != 0:
 				return None
@@ -2638,8 +2638,8 @@ class FFmpegExtractAudioPP(PostProcessor):
 	@staticmethod
 	def run_ffmpeg(path, out_path, codec, more_opts):
 		try:
-			ret = subprocess.call(['ffmpeg', '-y', '-i', path, '-vn', '-acodec', codec] + more_opts + ['--', out_path],
-					stdout=file(os.path.devnull, 'w'), stderr=subprocess.STDOUT)
+			cmd = ['ffmpeg', '-y', '-i', path, '-vn', '-acodec', codec] + more_opts + ['--', out_path]
+			ret = subprocess.call(cmd, stdout=file(os.path.devnull, 'w'), stderr=subprocess.STDOUT)
 			return (ret == 0)
 		except (IOError, OSError):
 			return False