diff -r ba6464ebc3f9 -r 31537cd8ec5e examples/image_convert.sh.example
--- a/examples/image_convert.sh.example	Sun Dec 12 11:53:00 2010 +0100
+++ b/examples/image_convert.sh.example	Sun Dec 12 12:15:17 2010 +0100
@@ -55,7 +55,7 @@
 # 'chroma subsampling mode' mjpegtools >= 1.8.0
 #
 SUBSAMPLINGMODE=""
-if ppmtoy4m -h | egrep -q "'420mpeg2'"; then
+if ppmtoy4m -h 2>&1 | egrep -q "'420mpeg2'"; then
     SUBSAMPLINGMODE="-S 420mpeg2"
 fi
 #