Starting PTS

I'm experimenting with mediafilesegmenter to segment our HLS streams (to-date, we've used ffmpeg), and everything is working fine. However, I notice that the start_time (PTS) of the segmented fMP4 is ~10 seconds, where ffmpeg was ~0.


Is there a way to change the start_time? Ideally, we'd like it to behave like ffmpeg and start ~0.


Thanks.