@@ -274,13 +274,14 @@ static int config_input(AVFilterLink *inlink)

 static int filter_frame(AVFilterLink *inlink, AVFrame *in)

 {

-    HQDN3DContext *hqdn3d = inlink->dst->priv;

-    AVFilterLink *outlink = inlink->dst->outputs[0];

+    AVFilterContext *ctx  = inlink->dst;

+    HQDN3DContext *hqdn3d = ctx->priv;

+    AVFilterLink *outlink = ctx->outputs[0];

     AVFrame *out;

     int direct, c;

-    if (av_frame_is_writable(in)) {

+    if (av_frame_is_writable(in) && !ctx->is_disabled) {

         direct = 1;

         out = in;

     } else {

@@ -304,6 +305,11 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)

                 hqdn3d->coefs[c ? CHROMA_TMP     : LUMA_TMP]);

     }

+    if (ctx->is_disabled) {

+        av_frame_free(&out);

+        return ff_filter_frame(outlink, in);

+    }

+

     if (!direct)

         av_frame_free(&in);

@@ -358,4 +364,5 @@ AVFilter avfilter_vf_hqdn3d = {

     .inputs    = avfilter_vf_hqdn3d_inputs,

     .outputs   = avfilter_vf_hqdn3d_outputs,

+    .flags     = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,

 };