diff --git a/tests/ffmpeg.regression.ref b/tests/ffmpeg.regression.ref
index 8f82e300f9..5ccc1da356 100644
--- a/tests/ffmpeg.regression.ref
+++ b/tests/ffmpeg.regression.ref
@@ -41,6 +41,9 @@ stddev: 10.23 PSNR:27.92 bytes:7602176
 f863f4198521bd76930ea33991b47273 *./data/a-error-mpeg4-adv.avi
 ba7fcd126c7c9fead5a5de71aaaf0624 *./data/out.yuv
 stddev: 16.80 PSNR:23.61 bytes:7602176
+198ad515da4f330d780c54fd8d6186ab *./data/a-error-mpeg4-nr.avi
+ebdb326e19aeab8e3c70d7050dc3b240 *./data/out.yuv
+stddev:  7.02 PSNR:31.19 bytes:7602176
 328ebd044362116e274739e23c482ee7 *./data/a-mpeg1b.mpg
 788a9d500dc8986231a18076fc80fd73 *./data/out.yuv
 stddev: 10.07 PSNR:28.06 bytes:7145472
diff --git a/tests/regression.sh b/tests/regression.sh
index c242bcbb10..b3796d765e 100755
--- a/tests/regression.sh
+++ b/tests/regression.sh
@@ -48,6 +48,7 @@ else
     do_ac3=y
     do_rc=y
     do_mpeg4adv=y
+    do_mpeg4nr=y
     do_mpeg1b=y
     do_asv1=y
     do_asv2=y
@@ -254,6 +255,16 @@ do_ffmpeg $file -y -qscale 7 -4mv -mbd 2 -part -ps 250 -error 10 -aic -f pgmyuv
 do_ffmpeg $raw_dst -y -i $file -f rawvideo $raw_dst 
 fi
 
+###################################
+if [ -n "$do_mpeg4nr" ] ; then
+# noise reduction
+file=${outfile}error-mpeg4-nr.avi
+do_ffmpeg $file -y -qscale 8 -4mv -mbd 2 -nr 200 -f pgmyuv -i $raw_src -an -vcodec mpeg4 $file
+
+# mpeg4 decoding
+do_ffmpeg $raw_dst -y -i $file -f rawvideo $raw_dst 
+fi
+
 ###################################
 if [ -n "$do_mpeg1b" ] ; then
 # mpeg1
diff --git a/tests/rotozoom.regression.ref b/tests/rotozoom.regression.ref
index 998ed6a45e..f9ced39800 100644
--- a/tests/rotozoom.regression.ref
+++ b/tests/rotozoom.regression.ref
@@ -41,6 +41,9 @@ stddev:  4.77 PSNR:34.54 bytes:7602176
 03ff35856faefb4882eaf4d86d95bea7 *./data/a-error-mpeg4-adv.avi
 8550acff0851ee915bd5800f1e20f37c *./data/out.yuv
 stddev:  9.66 PSNR:28.42 bytes:7602176
+74dbbba19d250a712702b1893c003461 *./data/a-error-mpeg4-nr.avi
+81b985840c03bf101302abde131e3900 *./data/out.yuv
+stddev:  4.67 PSNR:34.73 bytes:7602176
 671802a2c5078e69f7f422765ea87f2a *./data/a-mpeg1b.mpg
 d3d5876cef34b728602d5a22eee9249f *./data/out.yuv
 stddev:  5.93 PSNR:32.66 bytes:7145472