diff --git a/Demo/sgi/video/Vrec.py b/Demo/sgi/video/Vrec.py
index a78490f..164e89e 100755
--- a/Demo/sgi/video/Vrec.py
+++ b/Demo/sgi/video/Vrec.py
@@ -265,7 +265,7 @@
 		vout.setformat(format)
 		vout.setsize(x, y)
 		if fields:
-			vout.setpf(1, -2))
+			vout.setpf((1, -2))
 		vout.writeheader()
 		if preallocspace:
 			print 'Preallocating space...'