Ticket #317: patchgeox

diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index c897bc3..babedf2 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -754,6 +754,14 @@ intrax8_decoded:
 
     if(s->last_picture_ptr || s->low_delay){
         *data_size = sizeof(AVFrame);
+        if (s->codec_tag == AV_RL32("GEOX")) {
+            pict->data[0] += pict->linesize[0] * (avctx->height-1);
+            pict->data[1] += pict->linesize[1] * (avctx->height/2-1);
+            pict->data[2] += pict->linesize[2] * (avctx->height/2-1);
+            pict->linesize[0] *= -1;
+            pict->linesize[1] *= -1;
+            pict->linesize[2] *= -1;
+        }
         ff_print_debug_info(s, pict);
     }
 
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 8a308be..c33beeb 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -267,6 +267,15 @@ static int alloc_frame_buffer(MpegEncContext *s, Picture *pic)
         return -1;
     }
 
+    if (s->codec_tag == AV_RL32("GEOX")) {
+        pic->f.data[0] += pic->f.linesize[0] * (s->avctx->height-1);
+        pic->f.data[1] += pic->f.linesize[1] * (s->avctx->height/2-1);
+        pic->f.data[2] += pic->f.linesize[2] * (s->avctx->height/2-1);
+        pic->f.linesize[0] *= -1;
+        pic->f.linesize[1] *= -1;
+        pic->f.linesize[2] *= -1;
+    }
+
     if (s->linesize && (s->linesize   != pic->f.linesize[0] ||
                         s->uvlinesize != pic->f.linesize[1])) {
         av_log(s->avctx, AV_LOG_ERROR,