Added support for yet-unknown error codes

mpv.py

@@ -46,11 +46,16 @@ class ErrorCode:
 			-12:	lambda *a: SystemError('Error running mpv command', *a)
 		}
 
+	@classmethod
+	def DEFAULT_ERROR_HANDLER(ec, *args):
+		return ValueError(_mpv_error_string(ec).encode('utf-8'), ec, *a)
+
 	@classmethod
 	def raise_for_ec(kls, func, *args):
-        ec = kls.EXCEPTION_DICT[func(*args)]
-        if ec:
-            raise ec(*args)
+		ec = func(*args)
+		ex = kls.EXCEPTION_DICT.get(ec , kls.DEFAULT_ERROR_HANDLER)
+		if ex:
+			raise ex(ec, *args)
 
 
 class MpvFormat(c_int):
@@ -209,6 +214,10 @@ backend.mpv_event_name.restype = c_char_p
 backend.mpv_event_name.argtypes = [c_int]
 _mpv_event_name = backend.mpv_event_name
 
+backend.mpv_error_string.restype = c_char_p
+backend.mpv_error_string.argtypes = [c_int]
+_mpv_error_string = backend.mpv_error_string
+
 _handle_func('mpv_request_event', [MpvEventID, c_int])
 _handle_func('mpv_request_log_messages', [c_char_p])
 _handle_func('mpv_wait_event', [c_double], POINTER(MpvEvent))