diff --git a/libavformat/dv.c b/libavformat/dv.c
index c650b5b..54ed818 100644
--- a/libavformat/dv.c
+++ b/libavformat/dv.c
@@ -341,7 +341,8 @@
        c->audio_pkt[i].pts  = c->abytes * 30000*8 / c->ast[i]->codec->bit_rate;
        ppcm[i] = c->audio_buf[i];
     }
-    dv_extract_audio(buf, ppcm, c->sys);
+    if (c->ach)
+        dv_extract_audio(buf, ppcm, c->sys);
     c->abytes += size;
 
     /* We work with 720p frames split in half, thus even frames have