diff --git a/doc/demuxers.texi b/doc/demuxers.texi
index b7ddebb9a9..35a1561439 100644
--- a/doc/demuxers.texi
+++ b/doc/demuxers.texi
@@ -151,6 +151,7 @@ probed and 0 otherwise.
 @item auto_convert
 If set to 1, try to perform automatic conversions on packet data to make the
 streams concatenable.
+The default is 1.
 
 Currently, the only conversion is adding the h264_mp4toannexb bitstream
 filter to H.264 streams in MP4 format. This is necessary in particular if
diff --git a/libavformat/concatdec.c b/libavformat/concatdec.c
index f07cfd7e8f..07db9f96a3 100644
--- a/libavformat/concatdec.c
+++ b/libavformat/concatdec.c
@@ -627,7 +627,7 @@ static const AVOption options[] = {
     { "safe", "enable safe mode",
       OFFSET(safe), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, DEC },
     { "auto_convert", "automatically convert bitstream format",
-      OFFSET(auto_convert), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
+      OFFSET(auto_convert), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, DEC },
     { NULL }
 };