movenc: Write ?xyz geotag metadata for mov files

Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/movenc.c

@@ -2195,6 +2195,7 @@ static int mov_write_udta_tag(AVIOContext *pb, MOVMuxContext *mov,
         mov_write_string_metadata(s, pb_buf, "\251cpy", "copyright",   0);
         mov_write_string_metadata(s, pb_buf, "\251mak", "make",        0);
         mov_write_string_metadata(s, pb_buf, "\251mod", "model",       0);
+        mov_write_string_metadata(s, pb_buf, "\251xyz", "location",    0);
     } else {
         /* iTunes meta data */
         mov_write_meta_tag(pb_buf, mov, s);