diff --git a/rtmp/flv/writer.go b/rtmp/flv/writer.go
index 67c79bb..cfe5beb 100644
--- a/rtmp/flv/writer.go
+++ b/rtmp/flv/writer.go
@@ -23,6 +23,7 @@ func NewFLVWriter(stream_key string) (*FLVWriter, error) {
 		"-c:a", "aac",
 		"-c:v", "h264",
 		"-b:v", "1M",
+		"-g", "30",
 		"-hls_time", "6",
 		"-hls_list_size", "4",
 		"-hls_base_url", "/vid/" + stream_key + "/",