Properly initialize AVFrames to default values in the MPEG decoder (fixes

the AVFrame pts when decoding MPEG 1 and 2 video)

Originally committed as revision 19136 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mpegvideo.c

@@ -554,6 +554,9 @@ av_cold int MPV_common_init(MpegEncContext *s)
         }
     }
     CHECKED_ALLOCZ(s->picture, MAX_PICTURE_COUNT * sizeof(Picture))
+    for(i = 0; i < MAX_PICTURE_COUNT; i++) {
+        avcodec_get_frame_defaults((AVFrame *)&s->picture[i]);
+    }
 
     CHECKED_ALLOCZ(s->error_status_table, mb_array_size*sizeof(uint8_t))