diff --git a/cdosea-play b/cdosea-play
index ac59d32..b243b61 100755
--- a/cdosea-play
+++ b/cdosea-play
@@ -2,7 +2,6 @@
 if [ "x$1" == "xupdate" ]; then
     shift
     exec python3 -m cdoseaplay.update $@
-
 else
     shift
     gsettings set org.gnome.desktop.screensaver ubuntu-lock-on-suspend false
@@ -14,5 +13,9 @@ else
     gsettings set org.gnome.desktop.background primary-color '#888888'
     gsettings set org.gnome.desktop.background secondary-color '#888888'
     gsettings set org.gnome.desktop.background picture-options 'none'
-    exec python3 -m cdoseaplay.play $@
+    if [ "x$1" == "xsync" ]; then
+        exec python3 -m cdoseaplay.sync $@
+    else
+        exec python3 -m cdoseaplay.play $@
+    fi
 fi
diff --git a/cdoseaplay/lights.py b/cdoseaplay/lights.py
new file mode 100755
index 0000000..96f8e5f
--- /dev/null
+++ b/cdoseaplay/lights.py
@@ -0,0 +1,26 @@
+#!/usr/bin/python3
+import subprocess
+import sys
+import os
+import time
+
+import ox
+from pi import random
+
+path = sys.argv[1]
+
+n = int(os.path.getctime(path) - 1495280000)
+duration = ox.avinfo(path)['duration']
+
+seq = random(n * 1000)
+pos = 0
+lights = []
+while pos < duration - 15:
+    sleep = seq() + 15
+    light = seq() + 1
+    if pos + sleep > duration:
+        break
+    time.sleep(sleep)
+    cmd = ['/opt/LanBox-JSONRPC/fade.py', str(light)]
+    subprocess.Popen(cmd)
+    pos += sleep
diff --git a/cdoseaplay/sync.py b/cdoseaplay/sync.py
new file mode 100755
index 0000000..e139c6f
--- /dev/null
+++ b/cdoseaplay/sync.py
@@ -0,0 +1,212 @@
+#!/usr/bin/python3
+import argparse
+import datetime
+import os
+import random
+import socket
+import string
+import subprocess
+import sys
+import time
+from glob import glob
+from queue import Queue
+from socketserver import UDPServer, ThreadingMixIn, BaseRequestHandler
+from threading import Thread
+
+import ox
+import mpv
+
+import logging
+logger = logging.getLogger('cdosea')
+
+DEFAULT_PORT = 2680
+DEBUG = False
+
+def update_playlist(playlist, prefix='video/', position=None):
+    playlist = os.path.expanduser('~/Videos/cdosea.m3u')
+    prefix = os.path.expanduser('~/Videos/CDOSEA')
+
+    files = []
+    videos = {}
+    for letter in string.ascii_uppercase:
+        videos[letter] = glob('%s%s*.mp4' % (prefix, letter.lower()))
+        random.shuffle(videos[letter])
+
+    for i in range(10):
+        for letter in string.ascii_uppercase:
+            files.append(videos[letter][i])
+
+    if position is None:
+        today = datetime.date.today()
+        seconds_since_midnight = time.time() - time.mktime(today.timetuple())
+        offset = 0
+        position = 0
+
+        while offset < seconds_since_midnight:
+            f = files.pop(0)
+            try:
+                offset += ox.avinfo(f)['duration']
+                files.append(f)
+            except:
+                pass
+            position += 1
+    else:
+        pos = position
+        while pos:
+            f = files.pop(0)
+            files.append(f)
+            pos -= 1
+
+    with open(playlist, 'w') as f:
+        f.write('\n'.join(files))
+        f.write('\n')
+    return position, len(files)
+
+def trigger_lights(path):
+    cmd = ['python3', '-m', 'cdoseaplay.lights', path]
+    subprocess.Popen(cmd)
+
+class ThreadingUDPServer(ThreadingMixIn, UDPServer):
+    pass
+
+    def q_binding(self, *args):
+        self.player.running = False
+        self.shutdown()
+
+class Handler(BaseRequestHandler):
+
+    def handle(self):
+        data = self.request[0].strip()
+        logger.debug("%s said: %s", self.client_address[0], data)
+        queue = False
+        if data == b'POS':
+            response = ('%d' % self.server.player.position).encode()
+        else:
+            if self.server.player.playing:
+                response = b'PLAYING'
+            else:
+                response = b'WAITING'
+            queue = True
+        socket = self.request[1]
+        socket.sendto(response, self.client_address)
+        if queue:
+            self.server.player.queue.put('')
+
+class Player(Thread):
+    first = True
+    running = True
+    playing = False
+    current = ''
+    playlist_items = 260
+
+    def __init__(self, peer, player, playlist, lights=False):
+        self.peer = peer
+        self.playlist = playlist
+        self.player = player
+        self.lights = lights
+        self.queue = Queue()
+        Thread.__init__(self)
+        self.daemon = True
+        self.start()
+
+    def run(self):
+        logger.debug("update playlist")
+        self.position, self.playlist_items = update_playlist(self.playlist, position=self.get_position())
+        logger.debug("load playlist")
+        self.player.loadlist(self.playlist)
+        self.player.pause = True
+        while self.running:
+            logger.debug("play")
+            self.play()
+            self.position = (self.position + 1) % self.playlist_items
+            logger.debug("ping")
+            self.ping()
+            logger.debug("wait")
+            self.queue.get()
+
+    def play(self):
+        self.playing = True
+        self.player.pause = False
+        if self.lights:
+            trigger_lights(self.player.path.decode())
+        self.player.wait_for_playback()
+        self.player.pause = True
+        self.playing = False
+
+    def ping(self):
+        data = 'NEXT'
+        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+        logger.debug("ping: %s %s", self.peer, data)
+        sock.sendto(bytes(data + "\n", "utf-8"), self.peer)
+        received = str(sock.recv(1024), "utf-8")
+        if received == 'WAITING' and not self.queue.qsize():
+            if self.first:
+                self.queue.put('')
+                self.first = False
+        logger.debug("Sent:     %s", data)
+        logger.debug("Received: %s", received)
+
+    def get_position(self):
+        try:
+            sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+            sock.settimeout(1)
+            data = 'POS'
+            sock.sendto(bytes(data + "\n", "utf-8"), self.peer)
+            received = str(sock.recv(1024), "utf-8")
+            pos = int(received)
+        except socket.timeout:
+            logger.debug('no response', exc_info=1)
+            pos = None
+        return pos
+
+
+def my_log(loglevel, component, message):
+    logger.debug('[{}] {}: {}'.format(loglevel, component, message))
+
+def main():
+    parser = argparse.ArgumentParser(description='play 2 screens in sync')
+    parser.add_argument('--peer', help='ip[:port] of peer', required=True)
+    parser.add_argument('--port', type=int, help='local port', default=DEFAULT_PORT)
+    parser.add_argument('--playlist', help='play.m3u', default='play.m3u')
+    parser.add_argument('--window', action='store_true', help='run in window', default=False)
+    parser.add_argument('--debug', action='store_true', help='debug', default=False)
+    parser.add_argument('--lights', action='store_true', help='lights', default=False)
+    args = parser.parse_args()
+
+    if ':' in args.peer:
+        peer = args.peer.split(':')
+        peer = (peer[0], int(peer[1]))
+    else:
+        peer = (args.peer, DEFAULT_PORT)
+
+    DEBUG = args.debug
+    if DEBUG:
+        log_format = '%(asctime)s:%(levelname)s:%(name)s:%(message)s'
+        logging.basicConfig(level=logging.DEBUG, format=log_format)
+    base = os.path.dirname(os.path.abspath(__file__))
+    os.chdir(base)
+    if args.lights:
+        time.sleep(5)
+
+    # 42 max
+    player = mpv.MPV(
+        log_handler=my_log, input_default_bindings=True,
+        input_vo_keyboard=True, sub_text_font_size=28, sub_text_font='Menlo'
+    )
+    player.fullscreen = not args.window
+    player.loop = 'inf'
+
+    server = ThreadingUDPServer(('0.0.0.0', args.port), Handler)
+    server.player = Player(peer, player, args.playlist, args.lights)
+    player.register_key_binding('q', server.q_binding)
+
+    logger.debug("listen on %s...", args.port)
+    try:
+        server.serve_forever()
+    except KeyboardInterrupt:
+        pass
+    del player
+
+
+if __name__ == "__main__":
+    main()