may I add advertise frame at the beginning when play?
What do you mean with this? Are you asking if you can put additional frames which are used for advertisements?
Yes, you can. EMS has actually nothing to do with this method I’m going to mention. You can do this by putting your additional frames in your stream file being played, or you can put a file having the ads and put it at the start of a playlist (.lst file).
However, if you’re asking if EMS is able to put advertising frames at the beginning EVERY TIME you do a playback, I can only suggest doing this with a playlist. There are no other ways for now.