Hello,
I think we have the same problem like you.
We want to build a sreaming system in our church with 3 cameras. We have ptz ip cameras with rtsp stream, an analog audio mixer and we wanted to use the OBS program for streaming, but we noticed that the videos from the cameras are in delay, compared to each other, and also compared to the audio from the analog audio mixer.
In the OBS we can adjust the audio and also the video delay parameters, but we noticed that each time we restart the OBS, the 3 video feeds and the audio feed are delayed in a random way, so the previously adjusted delay compensation parameters are not covering the actual delay situation.
The builders of the system said that maybe using vMix instead of OBS will solve the problem.
Did you managed to solve it somehow with OBS or other program?
Thank you in advance!
Zoltán