Merge commit 'c71c80f5'

* commit 'c71c80f5':
  pthread: unref already decoded frames when flushing the decoder
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/pthread.c

@@ -928,6 +928,7 @@ void ff_thread_flush(AVCodecContext *avctx)
         PerThreadContext *p = &fctx->threads[i];
         // Make sure decode flush calls with size=0 won't return old frames
         p->got_frame = 0;
+        av_frame_unref(&p->frame);
 
         release_delayed_buffers(p);
     }