Fix unknown header 10001000 / http://samples.mplayerhq.hu/real/VC-RV10/thankyou.rm / issue809

Originally committed as revision 16967 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/rv10.c

@@ -547,6 +547,9 @@ static av_cold int rv10_decode_init(AVCodecContext *avctx)
     if (avctx->sub_id == 0x10000000) {
         s->rv10_version= 0;
         s->low_delay=1;
+    } else if (avctx->sub_id == 0x10001000) {
+        s->rv10_version= 3;
+        s->low_delay=1;
     } else if (avctx->sub_id == 0x10002000) {
         s->rv10_version= 3;
         s->low_delay=1;