insert_filter     819 fftools/ffmpeg_filter.c             ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
insert_filter     821 fftools/ffmpeg_filter.c             ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
insert_filter     824 fftools/ffmpeg_filter.c             ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
insert_filter     826 fftools/ffmpeg_filter.c             ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
insert_filter     830 fftools/ffmpeg_filter.c             ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);