diff --git a/tests/test.conf b/tests/test.conf
index cc7c1b8cd1..6950b18a8a 100644
--- a/tests/test.conf
+++ b/tests/test.conf
@@ -57,7 +57,7 @@ FileMaxSize 100M
 
 # Fire up ffmpeg pointing at this stream
 
-Launch -bitexact -dct_algo 1 -idct_algo 2 -y -f pgmyuv -i vsynth1/%125*d.pgm
+Launch -bitexact -dct_algo 1 -idct_algo 2 -y -f pgmyuv -i vsynth1/%50*d.pgm
 acl allow localhost
 </Feed>