static const AVOption swaprect_options[] = {
{ "w", "set rect width", OFFSET(w), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
{ "h", "set rect height", OFFSET(h), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
static const AVOption swaprect_options[] = {
{ "w", "set rect width", OFFSET(w), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
{ "h", "set rect height", OFFSET(h), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },