diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c
index 713b42d18f..ba352d5c4c 100644
--- a/libavcodec/mpeg12.c
+++ b/libavcodec/mpeg12.c
@@ -392,13 +392,19 @@ void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
     // RAL: Forward f_code also needed for B frames
     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
         put_bits(&s->pb, 1, 0); /* half pel coordinates */
-        put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
+        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
+            put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
+        else
+            put_bits(&s->pb, 3, 7); /* forward_f_code */
     }
     
     // RAL: Backward f_code necessary for B frames
     if (s->pict_type == B_TYPE) {
         put_bits(&s->pb, 1, 0); /* half pel coordinates */
-        put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
+        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
+            put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
+        else
+            put_bits(&s->pb, 3, 7); /* backward_f_code */
     }
 
     put_bits(&s->pb, 1, 0); /* extra bit picture */
@@ -406,10 +412,18 @@ void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
         put_header(s, EXT_START_CODE);
         put_bits(&s->pb, 4, 8); //pic ext
-        put_bits(&s->pb, 4, s->f_code);
-        put_bits(&s->pb, 4, s->f_code);
-        put_bits(&s->pb, 4, s->b_code);
-        put_bits(&s->pb, 4, s->b_code);
+        if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
+            put_bits(&s->pb, 4, s->f_code);
+            put_bits(&s->pb, 4, s->f_code);
+        }else{
+            put_bits(&s->pb, 8, 255);
+        }
+        if (s->pict_type == B_TYPE) {
+            put_bits(&s->pb, 4, s->b_code);
+            put_bits(&s->pb, 4, s->b_code);
+        }else{
+            put_bits(&s->pb, 8, 255);
+        }
         put_bits(&s->pb, 2, s->intra_dc_precision);
         put_bits(&s->pb, 2, s->picture_structure= PICT_FRAME);
         put_bits(&s->pb, 1, s->top_field_first);
diff --git a/tests/ffmpeg.regression.ref b/tests/ffmpeg.regression.ref
index 43f991650c..b4d5290a7a 100644
--- a/tests/ffmpeg.regression.ref
+++ b/tests/ffmpeg.regression.ref
@@ -1,8 +1,8 @@
 ffmpeg regression test
-6787ecce1da78d5e0cdeb35931f3212c *./data/a-mpeg1.mpg
+b85daef6da4204e2f85376a34d9ada8d *./data/a-mpeg1.mpg
 6713259d72260740bbddaea30631ea18 *./data/out.yuv
 stddev:  7.58 bytes:7299072
-40b1ce56144067f5c8d4df422705ae6a *./data/a-mpeg2.vob
+6640be3963445c470f148382aab77af0 *./data/a-mpeg2.vob
 9f5d85c6473b802a9d86cfc01a3ed046 *./data/out.yuv
 stddev:  7.66 bytes:7450624
 d0dc46dd831398237a690ebbeff18b64 *./data/a-msmpeg4v2.avi
@@ -35,7 +35,7 @@ stddev: 10.53 bytes:7145472
 2cbab98ebef5fbd229c66fb6435bf9a2 *./data/a-mpeg4-adv.avi
 b54262af56f6681186fa2c44e4ef6ec7 *./data/out.yuv
 stddev:  7.32 bytes:7602176
-5515306aa3c69112ee627023856bd696 *./data/a-mpeg1b.mpg
+3fd47ba846e8d7631304d945af410da2 *./data/a-mpeg1b.mpg
 bd047a4567c366566da96874d176199d *./data/out.yuv
 stddev:  6.35 bytes:6993920
 07042f42b3119c39eb26537a84a451df *./data/a-mjpeg.avi
diff --git a/tests/rotozoom.regression.ref b/tests/rotozoom.regression.ref
index a86e24de51..b01472477a 100644
--- a/tests/rotozoom.regression.ref
+++ b/tests/rotozoom.regression.ref
@@ -1,8 +1,8 @@
 ffmpeg regression test
-6dce999b1f02a94dfd6d6222caf06ff1 *./data/a-mpeg1.mpg
+31334d408162b55725075347e382d313 *./data/a-mpeg1.mpg
 0cf790edd0f4c5cf993c2d59211b9de2 *./data/out.yuv
 stddev:  4.91 bytes:7299072
-bbb41fb21c836cff975442e583702216 *./data/a-mpeg2.vob
+8d7dcc133e04f24f3fb40cdada990b24 *./data/a-mpeg2.vob
 f5436b327c38b66eb95f3428aff790f1 *./data/out.yuv
 stddev:  4.94 bytes:7450624
 14db391f167b52b21a983157b410affc *./data/a-msmpeg4v2.avi
@@ -35,7 +35,7 @@ stddev:  4.32 bytes:7145472
 aeb300900461bdf9e0321934aa6dcc93 *./data/a-mpeg4-adv.avi
 e465df12f2c8a6492a6ec0b1bddc1d0d *./data/out.yuv
 stddev:  4.97 bytes:7602176
-fc873784878d9588e748c1494df606be *./data/a-mpeg1b.mpg
+33c05290014210e4fb890a11954e1a00 *./data/a-mpeg1b.mpg
 c9b8f923d91d6a574b0673e05fd2d6bd *./data/out.yuv
 stddev:  4.61 bytes:6993920
 e9218a1db885fe0262e88f9df630307d *./data/a-mjpeg.avi