diff --git a/av/avutil/avutil.go b/av/avutil/avutil.go
index 59ebd4a..1e980cd 100644
--- a/av/avutil/avutil.go
+++ b/av/avutil/avutil.go
@@ -300,11 +300,12 @@ func CopyFile(dst av.Muxer, src av.Demuxer) (err error) {
 		return
 	}
 	if err = CopyPackets(dst, src); err != nil {
-		return
+		if err != io.EOF {
+			return
+		}
 	}
 	if err = dst.WriteTrailer(); err != nil {
 		return
 	}
 	return
 }
-