Not sure if you are already tracking/aware, but the RTSP streaming seems to be very inconsistent. I’ve checked this running VLC on the stream sources and they stay in sync On the app, running on a galaxy tab a7, the stream will stall out and eventually, minutes later will catch-up, but generally the stream runs way behind realtime.
@mfinity RTSP stream slow down can be caused by a lot of factors. The app is configured to generally minimize any buffering and skip ahead when connection is slow for whatever reason, so there might something specific here.
When you checked using VLC, were you using VLC app on the same Android device?
What is the camera model?
Are you using RTSP integration or something else?