diff --git a/debugserver/srv.go b/debugserver/srv.go
new file mode 100644
index 0000000..e80f3b5
--- /dev/null
+++ b/debugserver/srv.go
@@ -0,0 +1,118 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"image"
+	"image/color"
+	"log"
+	"net"
+	"os"
+	"time"
+
+	"github.com/dmisol/animportal/defs"
+	"gocv.io/x/gocv"
+)
+
+func main() {
+	// Listen for incoming connections.
+	l, err := net.Listen("tcp", ":50000")
+	if err != nil {
+		log.Println("istening:", err.Error())
+		os.Exit(1)
+	}
+	// Close the listener when the application closes.
+	defer l.Close()
+	for {
+		// Listen for an incoming connection.
+		conn, err := l.Accept()
+		if err != nil {
+			log.Println("accepting: ", err.Error())
+			os.Exit(1)
+		}
+		// Handle connections in a new goroutine.
+		go handler(conn)
+	}
+}
+
+func handler(conn net.Conn) {
+	defer conn.Close()
+
+	buf := make([]byte, 2048)
+	// initial json
+	if _, err := conn.Read(buf); err != nil {
+		log.Println("reading:", err.Error())
+		return
+	}
+	var init *defs.Init
+
+	if err := json.Unmarshal(buf, init); err != nil {
+		log.Println("initial json", err)
+		return
+	}
+
+	var started chan bool
+	go func() {
+		// wait for the first "audio" file
+		audio := <-started
+		if !audio {
+			return
+		}
+
+		img := gocv.NewMatWithSize(init.W, init.H, gocv.MatTypeCV8UC3)
+		fps := 24
+		if init.FPS != 0 {
+			fps = init.FPS
+		}
+		dt := 10000000000 / fps
+		t := time.NewTicker(time.Nanosecond * time.Duration(dt))
+		defer t.Stop()
+
+		index := 0
+		for {
+			<-t.C
+			name := fmt.Sprintf("%s/%d.png", init.Dir, index)
+			index++
+
+			if err := firePng(conn, &img, name); err != nil {
+				log.Println("senging png", err)
+				return
+			}
+		}
+	}()
+
+	running := false
+	for {
+		i, err := conn.Read(buf)
+		if err != nil {
+			log.Println("read", err)
+			if !running {
+				started <- false
+			}
+			return
+		}
+		if err = os.Remove(string(buf[:i])); err != nil {
+			log.Println("removing", err)
+			if !running {
+				started <- false
+			}
+			return
+		}
+		if !running {
+			log.Println("first audio")
+			started <- true
+			running = true
+		}
+	}
+}
+
+func firePng(c net.Conn, img *gocv.Mat, name string) (err error) {
+	gocv.PutText(img, time.Now().String(), image.Point{5, 5}, 0, 5.0, color.RGBA{0, 0, 255, 0}, 2)
+	if res := gocv.IMWrite(name, *img); !res {
+		err = errors.New("failed to write " + name)
+		return
+	}
+	_, err = c.Write([]byte(name))
+	return
+}
diff --git a/go.mod b/go.mod
index 3af2c55..7c602f8 100644
--- a/go.mod
+++ b/go.mod
@@ -12,6 +12,7 @@ require (
 	github.com/pion/webrtc/v3 v3.1.43
 	github.com/valyala/fasthttp v1.39.0
 	github.com/zaf/resample v0.0.0-20220109201959-aca35f45e6fa
+	gocv.io/x/gocv v0.31.0
 	gopkg.in/yaml.v2 v2.4.0
 )
 
diff --git a/go.sum b/go.sum
index 46a9a75..16e3827 100644
--- a/go.sum
+++ b/go.sum
@@ -105,6 +105,7 @@ github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0U
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/hybridgroup/mjpeg v0.0.0-20140228234708-4680f319790e/go.mod h1:eagM805MRKrioHYuU7iKLUyFPVKqVV6um5DAvCkUtXs=
 github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
@@ -156,6 +157,7 @@ github.com/onsi/gomega v1.10.3/go.mod h1:V9xEwhxec5O8UDM77eCW8vLymOMltsqPVYWrpDs
 github.com/onsi/gomega v1.15.0/go.mod h1:cIuvLEne0aoVhAgh/O6ac0Op8WWw9H6eYCriF+tEHG0=
 github.com/onsi/gomega v1.17.0 h1:9Luw4uT5HTjHTN8+aNcSThgH1vdXnmdJ8xIfZ4wyTRE=
 github.com/onsi/gomega v1.17.0/go.mod h1:HnhC7FXeEQY45zxNK3PPoIUhzk/80Xly9PcubAlGdZY=
+github.com/pascaldekloe/goe v0.1.0/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
 github.com/pion/datachannel v1.5.2 h1:piB93s8LGmbECrpO84DnkIVWasRMk3IimbcXkTQLE6E=
 github.com/pion/datachannel v1.5.2/go.mod h1:FTGQWaHrdCwIJ1rw6xBIfZVkslikjShim5yr05XFuCQ=
 github.com/pion/dtls/v2 v2.1.3/go.mod h1:o6+WvyLDAlXF7YiPB/RlskRoeK+/JtuaZa5emwQcWus=
@@ -258,6 +260,8 @@ go.uber.org/goleak v1.1.11/go.mod h1:cwTWslyiVhfpKIDGSZEM2HlOvcqm+tG4zioyIeLoqMQ
 go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
 go.uber.org/zap v1.19.0/go.mod h1:xg/QME4nWcxGxrpdeYfq7UvYrLh66cuVKdrbD1XF/NI=
 go.uber.org/zap v1.21.0/go.mod h1:wjWOCqI0f2ZZrJF/UufIOkiC8ii6tm1iqIsLo76RfJw=
+gocv.io/x/gocv v0.31.0 h1:BHDtK8v+YPvoSPQTTiZB2fM/7BLg6511JqkruY2z6LQ=
+gocv.io/x/gocv v0.31.0/go.mod h1:oc6FvfYqfBp99p+yOEzs9tbYF9gOrAQSeL/dyIPefJU=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=