Force MPEG demuxer

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit ff7ee990e3eac51beec12d73044e4fc23efd58b4)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/access/vdr.c

@@ -201,6 +201,8 @@ static int Open( vlc_object_t *p_this )
         return VLC_EGENERIC;
     }
 
+    free( p_access->psz_demux );
+    p_access->psz_demux = strdup( p_sys->b_ts_format ? "ts" : "ps" );
     return VLC_SUCCESS;
 }