diff --git a/tests/libav.regression.ref b/tests/libav.regression.ref
index 84cdfccbe5..1fe7e8d26f 100644
--- a/tests/libav.regression.ref
+++ b/tests/libav.regression.ref
@@ -8,6 +8,8 @@ be8eb1b5705c8105e4727258e448cb24 *./data/b-libav.rm
 ./data/b-libav.mpg CRC=eda0e29e
 01a4130e776b8955fa99e477113e94fd *./data/b-libav.swf
 ./data/b-libav.swf CRC=eaaf4640
+f13889dd08a4968e2b783771c7a29229 *./data/b-libav.ffm
+./data/b-libav.ffm CRC=94c26232
 9d1a1e4d23f16ecee9ad46f913acbbe0 *./data/b-libav.flv
 ./data/b-libav.flv CRC=8a731c32
 2759fdd5f1014abfefe36376649c9c90 *./data/b-libav.mov
diff --git a/tests/regression.sh b/tests/regression.sh
index 981a764f56..6970649f33 100755
--- a/tests/regression.sh
+++ b/tests/regression.sh
@@ -461,9 +461,9 @@ do_ffmpeg $file -t 1 -y -qscale 10 -f pgmyuv -i $raw_src -f s16le -i $pcm_src -a
 do_ffmpeg_crc $file -i $file
 
 # ffm
-#file=${outfile}libav.ffm
-#do_ffmpeg $file -t 1 -y -qscale 10 -f pgmyuv -i $raw_src -f s16le -i $pcm_src $file
-#do_ffmpeg_crc $file -i $file
+file=${outfile}libav.ffm
+do_ffmpeg $file -t 1 -y -qscale 10 -f pgmyuv -i $raw_src -f s16le -i $pcm_src $file
+do_ffmpeg_crc $file -i $file
 
 # flv
 file=${outfile}libav.flv