If you combine this tutorial with the audio synchronization test you should find a much more reliable presentation for day-to-day use with little to no modifications required.

If you do not see the NTP option on your camera please proceed with updating the firmware using the PTZOptics Firmware Finder. My hunch is that there is a problem in FFMPEG default settings with RTSP/HTTP in blender.

ffplay -fflags nobuffer -rtsptransport tcp rtsp://:. The bug does not appear with file inputs ou webcam.

In the knowledgebase entry shared below you will learn how to leverage the NTP options on the camera, you PC and network to minimize video drift and allow for better synchronization of multiple cameras and audio feeds. This command will reduce noticeable the delay and will not introduce audio glitches.

Our network is a Unifi solution, top to bottom, that uses the following setup guide to for configuration for IP video On our network I typically see latency around 800ms - 900ms in testing in OBS using the VLC input option for RTSP.

While I cannot speak to the exact latency you will see via OBS I can likely assist with the 'drift' issue you are experiencing.

Ffmpeg rtsp stream latency