- Bug fixed on H.263 decoder initialization.

Originally committed as revision 220 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h263dec.c

@@ -115,11 +115,16 @@ static int h263_decode_frame(AVCodecContext *avctx,
         ret = h263_decode_picture_header(s);
         /* After H263 header decode we have the height, width,       */
         /* and other parameters. So then we could init the picture   */
-        if (s->width != avctx->width || s->height != avctx->height) {
-            avctx->width = s->width;
-            avctx->height = s->height;
         /* FIXME: By the way H263 decoder is evolving it should have */
         /* an H263EncContext                                         */
+        if (!s->context_initialized) {
+            avctx->width = s->width;
+            avctx->height = s->height;
+            if (MPV_common_init(s) < 0)
+                return -1;
+        } else if (s->width != avctx->width || s->height != avctx->height) {
+            /* H.263 could change picture size any time */
+            MPV_common_end(s);
             if (MPV_common_init(s) < 0)
                 return -1;
         }