diff --git a/rtmp/flv/writer.go b/rtmp/flv/writer.go
index 3b5f60a..67c79bb 100644
--- a/rtmp/flv/writer.go
+++ b/rtmp/flv/writer.go
@@ -26,6 +26,7 @@ func NewFLVWriter(stream_key string) (*FLVWriter, error) {
 		"-hls_time", "6",
 		"-hls_list_size", "4",
 		"-hls_base_url", "/vid/" + stream_key + "/",
+		"-hls_segment_type", "fmp4",
 		"-hls_flags", "delete_segments",
 		"-hls_flags", "+program_date_time",
 		"stream.m3u8",