Watermarking prerecorded streams

Can EvoStream be used to apply a watermark to a prerecorded stream, as opposed to a live stream? I’ve managed to get basic watermarking working by issuing a transcode command with the following parameters:

source=rtsp://myserver:5544/vod/mp4:sample.mp4 group=myGroup overlays=/var/evostreamms/media/watermark.png destinations=watermarkedsample keepAlive=0

Evostream immediately starts playing the file at “/var/evostreamms/media/sample.mp4”, transcoding it, and pushing the transcoded stream back to itself using the live FLV protocol. VLC can then view the stream using the URL:

rtmp://myserver/vod/watermarkedsample

However, I need the transcoding to start only when VLC connects, such that the client can view the entire video. Is such a thing possible with EvoStream? Thanks, Shane