vf_overlay: fix permissions.

libavfilter/vf_overlay.c

@@ -622,19 +622,18 @@ AVFilter avfilter_vf_overlay = {
                                           .start_frame     = start_frame_main,
                                           .draw_slice      = draw_slice_main,
                                           .end_frame       = end_frame_main,
-                                          .min_perms       = AV_PERM_READ,
-                                          .rej_perms       = AV_PERM_REUSE2|AV_PERM_PRESERVE, },
+                                          .min_perms       = AV_PERM_READ | AV_PERM_WRITE | AV_PERM_PRESERVE },
                                         { .name            = "overlay",
                                           .type            = AVMEDIA_TYPE_VIDEO,
                                           .config_props    = config_input_overlay,
                                           .start_frame     = start_frame_over,
                                           .draw_slice      = null_draw_slice,
                                           .end_frame       = end_frame_over,
-                                          .min_perms       = AV_PERM_READ,
-                                          .rej_perms       = AV_PERM_REUSE2, },
+                                          .min_perms       = AV_PERM_READ | AV_PERM_PRESERVE },
                                         { .name = NULL}},
     .outputs   = (const AVFilterPad[]) {{ .name            = "default",
                                           .type            = AVMEDIA_TYPE_VIDEO,
+                                          .rej_perms       = AV_PERM_WRITE,
                                           .config_props    = config_output,
                                           .request_frame   = request_frame, },
                                         { .name = NULL}},