@@ -43,6 +43,7 @@ typedef struct {

     AVRational        time_base;     ///< time_base to set in the output link

     AVRational        frame_rate;    ///< frame_rate to set in the output link

     unsigned          nb_failed_requests;

+    unsigned          warning_limit;

     /* video only */

     int               w, h;

@@ -183,6 +184,14 @@ int av_buffersrc_add_ref(AVFilterContext *s, AVFilterBufferRef *buf, int flags)

         return ret;

     }

     c->nb_failed_requests = 0;

+    if (c->warning_limit &&

+        av_fifo_size(c->fifo) / sizeof(buf) >= c->warning_limit) {

+        av_log(s, AV_LOG_WARNING,

+               "%d buffers queued in %s, something may be wrong.\n",

+               c->warning_limit,

+               (char *)av_x_if_null(s->name, s->filter->name));

+        c->warning_limit *= 10;

+    }

     return 0;

 }

@@ -261,6 +270,7 @@ static av_cold int init_video(AVFilterContext *ctx, const char *args)

            c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,

            c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,

            c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));

+    c->warning_limit = 100;

     return 0;

 fail:

@@ -320,6 +330,7 @@ static av_cold int init_audio(AVFilterContext *ctx, const char *args)

            "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",

            s->time_base.num, s->time_base.den, s->sample_fmt_str,

            s->sample_rate, s->channel_layout_str);

+    s->warning_limit = 100;

 fail:

     av_opt_free(s);