We have such test case:
1. User1 is publishing "video_stream1" with video only(H.264) to Wowza server via RTMP.
2. User2 is playing back this "video_stream1" using Flash Player application.


We have an external pre-recorded audio data "stream2".
Is there way to inject this audio data into "video_stream1" which being playing back by User2?
Result: User2 watches the video stream and hears the injected audio.

Can we implement it using Wowza Server Side API? Any advices?

Currently we are trying to use Publisher API. But it seems that the Publisher works with new streams only. But we need to reuse an existing playback stream and inject audio data into this existing stream...