mpegvideo: move setting encoding-only vars from common_defaults() to encode_defaults()

libavcodec/mpegvideo.c

@@ -788,9 +788,6 @@ void ff_MPV_common_defaults(MpegEncContext *s)
 
     s->coded_picture_number  = 0;
     s->picture_number        = 0;
-    s->input_picture_number  = 0;
-
-    s->picture_in_gop_number = 0;
 
     s->f_code                = 1;
     s->b_code                = 1;

libavcodec/mpegvideo_enc.c

@@ -217,6 +217,9 @@ static void MPV_encode_defaults(MpegEncContext *s)
     }
     s->me.mv_penalty = default_mv_penalty;
     s->fcode_tab     = default_fcode_tab;
+
+    s->input_picture_number  = 0;
+    s->picture_in_gop_number = 0;
 }
 
 /* init video encoder */