avfilter/af_dynaudnorm: improve EOF timestamp precision

libavfilter/af_dynaudnorm.c

@@ -706,7 +706,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
         cqueue_dequeue(s->is_enabled, &is_enabled);
 
         amplify_frame(s, out, is_enabled > 0.);
-        s->pts = out->pts + out->nb_samples;
+        s->pts = out->pts + av_rescale_q(out->nb_samples, av_make_q(1, outlink->sample_rate),
+                                         outlink->time_base);
         ret = ff_filter_frame(outlink, out);
     }
 
@@ -749,15 +750,17 @@ static int flush_buffer(DynamicAudioNormalizerContext *s, AVFilterLink *inlink,
 static int flush(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
+    AVFilterLink *inlink = ctx->inputs[0];
     DynamicAudioNormalizerContext *s = ctx->priv;
     int ret = 0;
 
     if (!cqueue_empty(s->gain_history_smoothed[0])) {
-        ret = flush_buffer(s, ctx->inputs[0], outlink);
+        ret = flush_buffer(s, inlink, outlink);
     } else if (s->queue.available) {
         AVFrame *out = ff_bufqueue_get(&s->queue);
 
-        s->pts = out->pts + out->nb_samples;
+        s->pts = out->pts + av_rescale_q(out->nb_samples, av_make_q(1, outlink->sample_rate),
+                                         outlink->time_base);
         ret = ff_filter_frame(outlink, out);
     }