tweak appsink:

* do drop buffers in case we somehow fail to pick them up in time (since we have "max-buffers" set)
* we don't care about syncing (we don't have a real sink in the pipeline)
* we don't want async events

git-svn-id: https://xpra.org/svn/Xpra/trunk@9528 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/sound/src.py

@@ -61,9 +61,10 @@ def __init__(self, src_type=None, src_options={}, codecs=CODECS, codec_options={
         self.volume = self.pipeline.get_by_name("volume")
         self.sink = self.pipeline.get_by_name("sink")
         self.sink.set_property("emit-signals", True)
-        self.sink.set_property("max-buffers", 10)       #0?
-        self.sink.set_property("drop", False)
-        self.sink.set_property("sync", True)            #False?
+        self.sink.set_property("max-buffers", 10)
+        self.sink.set_property("drop", True)
+        self.sink.set_property("sync", False)
+        self.sink.set_property("async", False)
         self.sink.set_property("qos", False)
         try:
             #Gst 1.0: