@@ -56,6 +56,7 @@ AVABufferSinkParams *av_abuffersink_params_alloc(void)

 typedef struct {

     AVFifoBuffer *fifo;                      ///< FIFO buffer of video frame references

+    unsigned warning_limit;

     /* only used for video */

     enum PixelFormat *pixel_fmts;           ///< list of accepted pixel formats, must be terminated with -1

@@ -76,6 +77,7 @@ static av_cold int common_init(AVFilterContext *ctx)

         av_log(ctx, AV_LOG_ERROR, "Failed to allocate fifo\n");

         return AVERROR(ENOMEM);

     }

+    buf->warning_limit = 100;

     return 0;

 }

@@ -113,6 +115,14 @@ static void end_frame(AVFilterLink *inlink)

     /* cache frame */

     av_fifo_generic_write(buf->fifo,

                           &inlink->cur_buf, sizeof(AVFilterBufferRef *), NULL);

+    if (buf->warning_limit &&

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

+        av_log(ctx, AV_LOG_WARNING,

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

+               buf->warning_limit,

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

+        buf->warning_limit *= 10;

+    }

 }

 int av_buffersink_get_buffer_ref(AVFilterContext *ctx,