FF_PIX_FMT_FLAG_SW_FLAT_SUB  386 libavfilter/formats.c                 flags |= FF_PIX_FMT_FLAG_SW_FLAT_SUB;
FF_PIX_FMT_FLAG_SW_FLAT_SUB   99 libavfilter/vf_crop.c     ret = ff_formats_pixdesc_filter(&formats, 0, AV_PIX_FMT_FLAG_BITSTREAM | FF_PIX_FMT_FLAG_SW_FLAT_SUB);
FF_PIX_FMT_FLAG_SW_FLAT_SUB   71 libavfilter/vf_untile.c                                     FF_PIX_FMT_FLAG_SW_FLAT_SUB);