+#ifdef _WIN32
+ /* GPAC doesn't support Unicode filenames. */
+ char ansi_filename[MAX_PATH];
+ FAIL_IF_ERR( !x264_ansi_filename( psz_filename, ansi_filename, MAX_PATH, 1 ), "mp4", "invalid ansi filename\n" )
+ p_mp4->p_file = gf_isom_open( ansi_filename, GF_ISOM_OPEN_WRITE, NULL );
+#else