diff --git a/diskwriter/diskwriter.go b/diskwriter/diskwriter.go
index 7b068dc..0aee424 100644
--- a/diskwriter/diskwriter.go
+++ b/diskwriter/diskwriter.go
@@ -523,6 +523,7 @@ func (t *diskTrack) writeBuffered(force bool) error {
 				}
 			}
 		} else {
+			keyframe = true
 			if t.writer == nil {
 				if !t.conn.hasVideo {
 					err := t.conn.initWriter(0, 0)