Hey there @mikhail_Kartashov, haven’t heard from you in awhile, hope you’re doing well. I checked for you with our nDVR engineer and he said you would want to use playlist request delegate. to accomplish this.
Here is the doc for it:
There are two default ones.
The standard one uses a 0 based offset from the start of the stream. The alternative one uses a UTC based time.
You basically use a start and duration as query params to define the playback window.
If you have any issues setting it up, feel free to submit a support ticket and an engineer will walk through it with you until it functions the way you’d like.