diff --git a/TODO b/TODO
index 072621e..7fc516c 100644
--- a/TODO
+++ b/TODO
@@ -4,3 +4,6 @@
 3. 整体重构！
 4. 综合调试
 
+# 2022-9-30
+1. 视频没有图像
+2. qemu只在声卡初始化后才开始抓取声音
\ No newline at end of file
diff --git a/lib/webrtcconnection/connection.go b/lib/webrtcconnection/connection.go
index d9c78b1..d2494ec 100644
--- a/lib/webrtcconnection/connection.go
+++ b/lib/webrtcconnection/connection.go
@@ -61,7 +61,7 @@ func New(o *Options) (*Connection, error) {
 }
 
 func (c *Connection) Regist(offer *webrtc.SessionDescription) (*webrtc.SessionDescription, error) {
-	logrus.Debug("received offer ", offer)
+	logrus.Debug("received offer ")
 
 	rtc, err := c.api.NewPeerConnection(webrtc.Configuration{
 		ICEServers: []webrtc.ICEServer{
@@ -78,6 +78,10 @@ func (c *Connection) Regist(offer *webrtc.SessionDescription) (*webrtc.SessionDe
 		logrus.Debug("connection state has changed: ", connectionState.String())
 	})
 
+	rtc.OnICECandidate(func(i *webrtc.ICECandidate) {
+		logrus.Debug("cadidate: ", i)
+	})
+
 	for _, track := range c.stream.GetTracks() {
 		track.OnEnded(func(err error) {
 			logrus.Errorf("Track (ID: %s, kind: %s) ended with error: %v", track.ID(), track.Kind().String(), err)
diff --git a/servers/qemuserver/server.go b/servers/qemuserver/server.go
index f433b60..f3c9219 100644
--- a/servers/qemuserver/server.go
+++ b/servers/qemuserver/server.go
@@ -130,6 +130,7 @@ func (s *Server) Run() error {
 			logrus.Fatal(err)
 		}
 
+		logrus.Debug("start reading PCM")
 		defer close(s.pcm)
 		for {
 			b := make([]byte, 2048) // to be configured
diff --git a/web/src/components/AceScreen.vue b/web/src/components/AceScreen.vue
index 446e64a..69e8b59 100644
--- a/web/src/components/AceScreen.vue
+++ b/web/src/components/AceScreen.vue
@@ -101,7 +101,7 @@ onMounted(() => {
       el.oncontextmenu = () => false;
       document.getElementById("data").appendChild(el);
 
-      if (el.track.kind === "video") {
+      if (ev.track.kind === "video") {
         const ctx = video.getContext("2d");
         setTimeout(() => {
           ctx.drawImage(this.video, 0, 0);