diff --git a/tests/ffmpeg.regression.ref b/tests/ffmpeg.regression.ref
index 1e4c65bc44..ee9b073921 100644
--- a/tests/ffmpeg.regression.ref
+++ b/tests/ffmpeg.regression.ref
@@ -17,6 +17,8 @@ cbb3e7118b48671c686d046e7c1ae4b0 *./data/a-odivx.avi
 580000bfe2d4359d9aa9a9415f953b3b *./data/out.yuv
 7e040fda2b7696fea348a21b54eec1be *./data/a-mpeg4-adv.avi
 4c5e8754506ff2c53649541e4fcd2438 *./data/out.yuv
+3c65a1bc6866649e666286c825bd5b96 *./data/a-mpeg1b.mpg
+da8e21c7b78b7a25558dc319524b91d8 *./data/out.yuv
 5bcc6fd4b7dde27c74c633c761f0e5b1 *./data/a-mjpeg.avi
 f23a9e50a559e174766ee808c48fea22 *./data/out.yuv
 7a7bc04024061a1dc942fe87573fd8d6 *./data/a-rv10.rm
diff --git a/tests/regression.sh b/tests/regression.sh
index 004b7bb2c0..92dc9ad953 100755
--- a/tests/regression.sh
+++ b/tests/regression.sh
@@ -35,6 +35,7 @@ else
     do_ac3=y
     do_rc=y
     do_mpeg4adv=y
+    do_mpeg1b=y
 fi
 
 
@@ -179,6 +180,16 @@ do_ffmpeg $file -y -qscale 9 -4mv -hq -part -ps 1000 -f pgmyuv -i $raw_src -an -
 do_ffmpeg $raw_dst -y -i $file -f rawvideo $raw_dst 
 fi
 
+###################################
+if [ -n "$do_mpeg1b" ] ; then
+# mpeg1
+file=${outfile}mpeg1b.mpg
+do_ffmpeg $file -y -qscale 8 -bf 3 -f pgmyuv -i $raw_src -an -vcodec mpeg1video $file
+
+# mpeg1 decoding
+do_ffmpeg $raw_dst -y -i $file -f rawvideo $raw_dst 
+fi
+
 ###################################
 if [ -n "$do_mjpeg" ] ; then
 # mjpeg