Testcamera use frame timestamp when open from RTSP streaming API

Hi,

I use Nx Witness 4.2.0.34860.

I used Testcamera with the following command,

testcamera files=<filename> --pts

The file came from previous recording clip in Nx Witness.

I would like to keep the timestamp in the video frame, so I set --pts in command, according to the document as below.

Then I used Video API to get RTSP streaming url. When I pulled the stream, it seemed that Nx server reset the timestamp to current time.

Is there any way to keep the timestamp in the recording video frame when I open the RTSP stream served from Nx server?

Thank you.