@@ -532,6 +532,8 @@ static void do_video_out(AVFormatContext *s,

     /* by default, we output a single frame */

     nb_frames = 1;

+    *frame_size = 0;

+

     /* NOTE: the A/V sync is always done by considering the audio is

        the master clock. It is suffisant for transcoding or playing,

        but not for the general case */

@@ -1401,7 +1403,7 @@ static int av_encode(AVFormatContext **output_files,

                                 }

                                 do_video_out(os, ost, ist, &picture, &frame_size, audio_sync);

-                                if (do_vstats)

+                                if (do_vstats && frame_size)

                                     do_video_stats(os, ost, frame_size);

                             }

                             break;