we could handle rtsp, but we didn't update canHandle to know

what to do with them...  with this change rtsp objects are now
exported...  we had to add a rtpmimetype element so we would know
which base class to create..

[git-p4: depot-paths = "//depot/": change = 1575]

item.py

@@ -70,7 +70,14 @@ def canHandle(fobj):
 	dom = xml.dom.minidom.parse(fobj)
 	#print 'ch:', `dom`
 	obj = dom.getElementsByTagName('Object')[0]
-	mt = getElementText(obj.getElementsByTagName('mimetype')[0])
+	mtel = obj.getElementsByTagName('mimetype')
+	rtpel = obj.getElementsByTagName('rtpmimetype')
+	if mtel:
+		mt = getElementText(mtel[0])
+	elif rtpel:
+		mt = getElementText(rtpel[0])
+	else:
+		raise ValueError('failed to find mimetpe or rtppayloadtype')
 
 	#print 'ch:', `obj`, `mt`
 
@@ -87,6 +94,7 @@ def detectitem(path, fobj):
 
 	klass, mt = FileDIDL.buildClassMT(ItemObject, path, mimetype=mt)
 
+	#print 'match:', `klass`, `mt`
 	return klass, { 'path': path, 'dom': dom }
 
 registerklassfun(detectitem)