avfilter/vf_fade: add missing .flags for type option

libavfilter/vf_fade.c

@@ -413,8 +413,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 static const AVOption fade_options[] = {
     { "type", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
     { "t",    "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
-        { "in",  "fade-in",  0, AV_OPT_TYPE_CONST, { .i64 = FADE_IN },  .unit = "type" },
-        { "out", "fade-out", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_OUT }, .unit = "type" },
+        { "in",  "fade-in",  0, AV_OPT_TYPE_CONST, { .i64 = FADE_IN },  .flags = FLAGS, .unit = "type" },
+        { "out", "fade-out", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_OUT }, .flags = FLAGS, .unit = "type" },
     { "start_frame", "Number of the first frame to which to apply the effect.",
                                                     OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
     { "s",           "Number of the first frame to which to apply the effect.",