support range caps

oxtimeline/audio.py

@@ -54,6 +54,8 @@ class Audio(gst.Pipeline):
         caps = pad.get_caps()
         if 'audio' in str(caps):
             self.samplerate = caps[0]['rate']
+            if not isinstance(self.samplerate, int):
+                self.samplerate = self.samplerate.high
             pad.link(self.queue.get_pad("sink"))
             self.queue.link(self.conv)
             self.conv.link(self.rate,