LL-HLS extension #EXT-X-PROGRAM-DATE-TIME return timestamps from future

[mbakumenkov]

Describe the bug
Hi guys, I`ve returned with reproduction details for #1845

The problems is: #EXT-X-PROGRAM-DATE-TIME LL-HLS extension returns time from the future

To Reproduce
Steps to reproduce the behavior:

1. 1x Origin server v0.18.0 configurred as follows Origin.txt (reproduces on last master commit too)
2. 2x Edge servers v0.18.0 configurred as follows Edge.txt (reproduces on last master commit too)
3. Nginx-rtmp configured as follows nginx-rtmp.txt
4. push rtmp stream from OBS to nginx-rtmp (and nginx-rtmp configured for rtmp push to OME)

5. OBS and Nginx-rtmp are on the same machine, OME Origin and OME Edge on different. 6. On streaming machine start streaming and make a short disconnect: `sudo ip link set enp15s0 down && sudo ip link set enp15s0 up` 7. Check #EXT-X-PROGRAM-DATE-TIME extension returns timestamps from future. For example on https://www.theoplayer.com/test-your-stream-hls-dash-hesp **Expected behavior** #EXT-X-PROGRAM-DATE-TIME extension returns correct time

Logs
-logs-2025-05-20 07_54_41.txt - problem stream is "stream1"

Server (please complete the following information):

OS: Ubuntu 22.04
OvenMediaEngine Version: v0.18.0
Branch: master

Player (please complete the following information):

Device: Desktop PC
OS: Windows 11
Browser chrome
Version 136.0.7103.114 x64

Additional context
If remove nginx-rtmp from the streaming chain the problem disappears (direct rtmp push from OBS -> OME)

[getroot]

Hi, thank you for sharing the details.

• I’ve never used nginx-rtmp before. How is it different from OBS?
• Are playback and other things working normally in that situation?
• Does the issue not occur when playing directly from the Origin?

[mbakumenkov]

Hi, thank you for sharing the details.

• I’ve never used nginx-rtmp before. How is it different from OBS?
• Are playback and other things working normally in that situation?
• Does the issue not occur when playing directly from the Origin?

Hi!

• Its completely different, nginx-rtmp is a media server module for Nginx. Receives RTMP input from clients like OBS, and redistributes or transcodes it
• Everything is ok in this case, except EXT-X-PROGRAM-DATETIME values
• Seems like no, can`t reproduce

[getroot]

Thank you. I’m already aware that nginx-rtmp is a module of nginx and that it is a different piece of software from OBS.
What I wanted to know is what makes the RTMP streaming behavior different between OBS and nginx-rtmp, and why the issue can be reproduced with nginx-rtmp but not with OBS.
Understanding this difference could help with debugging, but since setting up nginx-rtmp myself to reproduce the issue will take some time, I wanted to ask first.

[mbakumenkov]

Thank you. I’m already aware that nginx-rtmp is a module of nginx and that it is a different piece of software from OBS. What I wanted to know is what makes the RTMP streaming behavior different between OBS and nginx-rtmp, and why the issue can be reproduced with nginx-rtmp but not with OBS. Understanding this difference could help with debugging, but since setting up nginx-rtmp myself to reproduce the issue will take some time, I wanted to ask first.

Sorry, unfortunately, I can't tell you what the difference is between rtmp in OBS and nginx-rtmp :(