@@ -92,6 +92,7 @@ static void free_pool(AVFilterPool *pool)

             AVFilterBufferRef *picref = pool->pic[i];

             /* free buffer: picrefs stored in the pool are not

              * supposed to contain a free callback */

+            av_assert0(!picref->buf->refcount);

             av_freep(&picref->buf->data[0]);

             av_freep(&picref->buf);

@@ -146,6 +147,7 @@ void avfilter_unref_buffer(AVFilterBufferRef *ref)

 {

     if (!ref)

         return;

+    av_assert0(ref->buf->refcount > 0);

     if (!(--ref->buf->refcount)) {

         if (!ref->buf->free) {

             store_in_pool(ref);