code: public void write(IRTMPEvent event) {
          if (!connection.isClosed()) {
              final IClientStream stream = connection.getStreamByChannelId(id);
              if (id > 3 && stream == null) {
                  log.warn("Non-existant stream for channel id: {}, session: {} discarding: {}", id, connection.getSessionId(), event);
              }
              // if the stream is non-existant, the event will go out with stream id == 0
              final Number streamId = (stream == null) ? 0 : stream.getStreamId();
              write(event, streamId);
          } else {
              log.debug("Connection {} is closed, cannot write to channel: {}", connection.getSessionId(), id);
          }
      }
docs: Writes packet from event data to RTMP connection.
  
  @param event
  Event data