Improve code stability

- NEVER use e.g. {} or [] as standard function arguments

resources/lib/PlexAPI.py

@@ -2190,7 +2190,7 @@ class API():
         """
         return self.item[0].attrib.get('optimizedForStreaming') == '1'
 
-    def getTranscodeVideoPath(self, action, quality={}):
+    def getTranscodeVideoPath(self, action, quality=None):
         """
 
         To be called on a VIDEO level of PMS xml response!
@@ -2211,6 +2211,8 @@ class API():
 
         TODO: mediaIndex
         """
+        if quality is None:
+            quality = {}
         xargs = clientinfo.ClientInfo().getXArgsDeviceInfo()
         # For DirectPlay, path/key of PART is needed
         # trailers are 'clip' with PMS xmls

resources/lib/playutils.py

@@ -55,14 +55,13 @@ class PlayUtils():
 
         else:
             self.logMsg("File is transcoding.", 1)
-            quality = {
-                'maxVideoBitrate': self.getBitrate(),
-                'videoResolution': self.getResolution(),
-                'videoQuality': '100'
-            }
             playurl = utils.tryEncode(self.API.getTranscodeVideoPath(
                 'Transcode',
-                quality=quality))
+                quality={
+                    'maxVideoBitrate': self.getBitrate(),
+                    'videoResolution': self.getResolution(),
+                    'videoQuality': '100'
+                }))
             # Set playmethod property
             utils.window('emby_%s.playmethod' % playurl, value="Transcode")