Set timestamp in RTMP/wowz output

Hello,

I would like to be able to modify/set the timestamps used in the RTMP/wowz live output. Either each frame, or just the initial value. I plan to get a timecode from a wowza server, and use that as the start timestamp of each GoCoder streaming session. Is this possible? Are there any examples of this or any frame level processing around to look at?

Thanks, Jeff