av_display_matrix_flip  879 libavcodec/h264.c             av_display_matrix_flip((int32_t *)rotation->data,
av_display_matrix_flip 2551 libavcodec/hevc.c         av_display_matrix_flip((int32_t *)rotation->data,
av_display_matrix_flip   84 libavutil/display.h void av_display_matrix_flip(int32_t matrix[9], int hflip, int vflip);