PIX_FMT_MONOBLACK  447 libavcodec/pngenc.c .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_PAL8, PIX_FMT_GRAY8, PIX_FMT_MONOBLACK, PIX_FMT_NONE},
PIX_FMT_MONOBLACK  456 libavcodec/tiffenc.c PIX_FMT_MONOBLACK, PIX_FMT_MONOWHITE,
PIX_FMT_MONOBLACK   73 libavutil/pixfmt.h PIX_FMT_MONOBLACK, ///<        Y        ,  1bpp, 0 is black, 1 is white