Added options to Vsend and Vreceive; moved common defaults to senddefs.
Optimized LiveVideoIn quite a bit; removed print stmt from LiveVideoOut.
diff --git a/Demo/sgi/video/senddefs.py b/Demo/sgi/video/senddefs.py
new file mode 100755
index 0000000..c3ce2cd
--- /dev/null
+++ b/Demo/sgi/video/senddefs.py
@@ -0,0 +1,11 @@
+# Defaults shared by Vsend and Vreceice
+
+DEFMCAST = '225.0.0.250'
+DEFPORT = 5555
+
+PKTMAX_UCAST = 16*1024 - 6
+PKTMAX_BCAST = 1450
+DEFPKTMAX = PKTMAX_BCAST
+
+DEFWIDTH = 400
+DEFHEIGHT = 300