diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index b087933f66..a6b0e04fde 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -724,10 +724,6 @@ assert(s->current_picture.pict_type == s->pict_type);
         ff_print_debug_info(s, pict);
     }
 
-    /* Return the Picture timestamp as the frame number */
-    /* we subtract 1 because it is added on utils.c     */
-    avctx->frame_number = s->picture_number - 1;
-
 #ifdef PRINT_FRAME_TIME
 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
 #endif
diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index f4c172b606..056e1cce77 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -7902,12 +7902,7 @@ static int decode_frame(AVCodecContext *avctx,
     assert(pict->data[0] || !*data_size);
     ff_print_debug_info(s, pict);
 //printf("out %d\n", (int)pict->data[0]);
-#if 0 //?
 
-    /* Return the Picture timestamp as the frame number */
-    /* we subtract 1 because it is added on utils.c     */
-    avctx->frame_number = s->picture_number - 1;
-#endif
     return get_consumed_bytes(s, buf_index, buf_size);
 }
 #if 0
diff --git a/libavcodec/svq3.c b/libavcodec/svq3.c
index 28dacf79a2..1d488b737b 100644
--- a/libavcodec/svq3.c
+++ b/libavcodec/svq3.c
@@ -1031,8 +1031,6 @@ static int svq3_decode_frame(AVCodecContext *avctx,
         *(AVFrame *) data = *(AVFrame *) &s->last_picture;
     }
 
-    avctx->frame_number = s->picture_number - 1;
-
     /* Do not output the last pic after seeking. */
     if (s->last_picture_ptr || s->low_delay) {
         *data_size = sizeof(AVFrame);
diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c
index 8d79c18172..acddeb9091 100644
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -4237,10 +4237,6 @@ assert(s->current_picture.pict_type == s->pict_type);
         ff_print_debug_info(s, pict);
     }
 
-    /* Return the Picture timestamp as the frame number */
-    /* we subtract 1 because it is added on utils.c     */
-    avctx->frame_number = s->picture_number - 1;
-
     av_free(buf2);
     return buf_size;
 }