@@ -232,7 +232,7 @@ static void close_input(AVFilterContext *ctx, unsigned in_no)

            ctx->input_pads[in_no].name, cat->nb_in_active);

 }

-static void find_next_delta_ts(AVFilterContext *ctx)

+static void find_next_delta_ts(AVFilterContext *ctx, int64_t *seg_delta)

 {

     ConcatContext *cat = ctx->priv;

     unsigned i = cat->cur_idx;

@@ -243,13 +243,15 @@ static void find_next_delta_ts(AVFilterContext *ctx)

     for (; i < imax; i++)

         pts = FFMAX(pts, cat->in[i].pts);

     cat->delta_ts += pts;

+    *seg_delta = pts;

 }

-static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no)

+static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no,

+                        int64_t seg_delta)

 {

     ConcatContext *cat = ctx->priv;

     AVFilterLink *outlink = ctx->outputs[out_no];

-    int64_t base_pts = cat->in[in_no].pts + cat->delta_ts;

+    int64_t base_pts = cat->in[in_no].pts + cat->delta_ts - seg_delta;

     int64_t nb_samples, sent = 0;

     int frame_nb_samples, ret;

     AVRational rate_tb = { 1, ctx->inputs[in_no]->sample_rate };

@@ -258,7 +260,7 @@ static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no)

     if (!rate_tb.den)

         return AVERROR_BUG;

-    nb_samples = av_rescale_q(cat->delta_ts - base_pts,

+    nb_samples = av_rescale_q(seg_delta - cat->in[in_no].pts,

                               outlink->time_base, rate_tb);

     frame_nb_samples = FFMAX(9600, rate_tb.den / 5); /* arbitrary */

     while (nb_samples) {

@@ -283,8 +285,9 @@ static int flush_segment(AVFilterContext *ctx)

     int ret;

     ConcatContext *cat = ctx->priv;

     unsigned str, str_max;

+    int64_t seg_delta;

-    find_next_delta_ts(ctx);

+    find_next_delta_ts(ctx, &seg_delta);

     cat->cur_idx += ctx->nb_outputs;

     cat->nb_in_active = ctx->nb_outputs;

     av_log(ctx, AV_LOG_VERBOSE, "Segment finished at pts=%"PRId64"\n",

@@ -295,7 +298,8 @@ static int flush_segment(AVFilterContext *ctx)

         str = cat->nb_streams[AVMEDIA_TYPE_VIDEO];

         str_max = str + cat->nb_streams[AVMEDIA_TYPE_AUDIO];

         for (; str < str_max; str++) {

-            ret = send_silence(ctx, cat->cur_idx - ctx->nb_outputs + str, str);

+            ret = send_silence(ctx, cat->cur_idx - ctx->nb_outputs + str, str,

+                               seg_delta);

             if (ret < 0)

                 return ret;

         }