fix build error

examples/streamer/main.cpp

@@ -210,7 +210,7 @@ shared_ptr<ClientTrackData> addVideo(const shared_ptr<PeerConnection> pc, const
     // create RTP configuration
     auto rtpConfig = make_shared<RtpPacketizationConfig>(ssrc, cname, payloadType, H264RtpPacketizer::defaultClockRate);
     // create packetizer
-    auto packetizer = make_shared<H264RtpPacketizer>(H264RtpPacketizer::Separator::Length, rtpConfig);
+    auto packetizer = make_shared<H264RtpPacketizer>(NalUnit::Separator::Length, rtpConfig);
     // create H264 handler
     auto h264Handler = make_shared<H264PacketizationHandler>(packetizer);
     // add RTCP SR handler