pts_time calculation for Splice Insert encoding

[cosec90]

Hi, I am having some problem scte encoding in my current application. First let me throw some light on what I am doing.

I have created one POIS server for SCTE35 conditioning. In one of the cases, I have to change the break duration of the in-band scte35 (Splice Insert) marker and send the new scte35. For eg. I am receiving a scte35 maker with duration 30 seconds so I will change it to 60 seconds re encode and send the updated marker.

As the duration of the marker has changed, I have to also require to recalculate the pts_time. pts_time is a required field to re-encode scte.
I don't know how to calculate it and I think this library dosen't have any method to calculate it(maybe I am wrong here).
Can someone please suggest as to how can I calculate pts_time with respect to break_duration ? I would be great if you can point out to any method that I can use.

I am not so much familiar with scte. My POIS server code is in python.

Thanks and have a great day!

[futzu]

I have no idea what a POIS server is, but then again, there is a lot I don't know.

If you want to change the break_duration, just change the break duration and re-encode.

a@debian:~/tunein$ pypy3
Python 3.9.16 (7.3.11+dfsg-2, Feb 06 2023, 16:52:03)
[PyPy 7.3.11 with GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>> from threefive import Cue
>>>> cue = Cue('/DBFAAAAAyiYAP/wFAUAAAABf+//uX+wrv4ApN46mZkBAQAgAh5DVUVJAAAAAH/AAACky\
4ABCDEwMTAwMDAwNAAAAAArI1sl=')
>>>> cue.decode()
True
>>>> cue.command.break_duration
120.053267
>>>> cue.command.break_duration = 180.0
>>>> cue.encode()
'/DBFAAAAAyiYAP/wFAUAAAABf+//uX+wrv4A9zFAmZkBAQAgAh5DVUVJAAAAAH/AAACky4ABCDEwMTAwMDAwNAAAAACIOyLB'
>>>> cue.command.break_duration
180.0
>>>> 

If you have an associated splice in add the change in cue.command.break_duration of the splice out to the pts_time of the the splice in . In this example 180 - 120.053267 = 59.946733 I would to the splicein pts_time and re-encode.

(SpliceOut )cue.command.pts_time + cue.command.break_duration = (SpliceIn) cue.command.pts_time

[futzu]

I looked up POIS server, and I found one using threefive, but a version from over a year ago.
I didn't know. :)
https://github.com/scunning1987/pois_reference_server
I strongly recommend using the latest threefive, it shouldn't break anything, but if something does, let me know and I'll help you sort it out.