{"w","Output video width",OFFSET(w_expr),AV_OPT_TYPE_STRING,{.str="iw"},.flags=FLAGS},
{"h","Output video height",OFFSET(h_expr),AV_OPT_TYPE_STRING,{.str="ih"},.flags=FLAGS},
{"interp_algo","Interpolation algorithm used for resizing",OFFSET(interp_algo),AV_OPT_TYPE_INT,{.i64=INTERP_ALGO_DEFAULT},0,INTERP_ALGO_COUNT-1,FLAGS,"interp_algo"},
{"force_original_aspect_ratio","decrease or increase w/h if necessary to keep the original AR",OFFSET(force_original_aspect_ratio),AV_OPT_TYPE_INT,{.i64=0},0,2,FLAGS,"force_oar"},