Intel H.263 aspect ratio processing fix.

libavcodec/intelh263dec.c

@@ -67,6 +67,7 @@ int ff_intel_h263_decode_picture_header(MpegEncContext *s)
     if (format < 6) {
         s->width = h263_format[format][0];
         s->height = h263_format[format][1];
+        s->avctx->sample_aspect_ratio.num=12;s->avctx->sample_aspect_ratio.den=11;
     }
     else {
         format = get_bits(&s->gb, 3);
@@ -92,9 +93,14 @@ int ff_intel_h263_decode_picture_header(MpegEncContext *s)
         skip_bits1(&s->gb);
         skip_bits(&s->gb, 9); // display height
         if(ar == 15){
-            skip_bits(&s->gb, 8); // aspect ratio - width
-            skip_bits(&s->gb, 8); // aspect ratio - height
+            s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 8); // aspect ratio - width
+            s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 8); // aspect ratio - height
         }
+        else {
+            s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[ar];
+        }
+        if(s->avctx->sample_aspect_ratio.num == 0)
+            av_log(s->avctx, AV_LOG_ERROR, "Invalid aspect ratio\n");
     }
 
     s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);