diff --git a/mplayer.c b/mplayer.c
index 664fdb7ef0..4df25a5010 100644
--- a/mplayer.c
+++ b/mplayer.c
@@ -3894,7 +3894,8 @@ if(auto_quality>0){
 
    if (mp_dvdnav_stream_has_changed(mpctx->stream)) {
      double ar = -1.0;
-     if (stream_control (mpctx->demuxer->stream,
+     if (mpctx->sh_video &&
+         stream_control (mpctx->demuxer->stream,
                          STREAM_CTRL_GET_ASPECT_RATIO, &ar)
          != STREAM_UNSUPPORTED)
        mpctx->sh_video->stream_aspect = ar;