#4161 log 'nocsc' warning just once per encoding / window

xpra/server/window/video_compress.py

@@ -432,7 +432,7 @@ def update_encoding_selection(self, encoding=None, exclude=None, init=False) ->
                 exclude.append(x)
                 continue
             csc_modes = self.full_csc_modes.strtupleget(x)
-            if not csc_modes or x not in self.core_encodings:
+            if (not csc_modes or x not in self.core_encodings) and first_time(f"nocsc-{x}-{self.wid}"):
                 exclude.append(x)
                 msg_args = ("Warning: client does not support any csc modes with %s on window %i", x, self.wid)
                 if x == "jpega" and not self.supports_transparency: