I am new to the forum, not sure where this belongs. We have 3 PTZ Optics cameras. Did not happen the first several years, but now the video and audio get out of sync during the worship. I have found that I can go into each camera in OBS and where it says source timing, I can hit OK and it will pause the camera and reset it.......... good for a while. My offset is 100 ms, and I have a gig switch dedicated to those devices. When it is happening I get < 1ms ping times. I have tried using network timing, but it is worse. Thanks for any ideas.
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Erratic video and audio sync - church system
- Thread starter Lesnelson
- Start date
Lawrence_SoCal
Active Member
Do the cameras stay in sync with themselves (ignoring audio)? or are the cameras drifting relative to each other?
easy to test by pointing all 3 cameras to same video source and run time sync check tool/video.. I use https://streamgeeks.us/fix-audio-sync-issue-in-obs/ running on a tablet or laptop
What connection are you using for the cameras - SDI, USB, HDMI (with capture device), NDI?
How is audio connected to OBS Studio PC? analog, USB, Dante?
if cameras aren't staying in sync with each other, I'd contact PTZ Optics for support
As for the dedicated switch: PoE?
is that switch/cameras on an isolated network segment (ie VLAN, or otherwise)?
I'm all for not fixing what isn't broken, but in the case, Operating System and driver updates have taken place (by default) automatically over the years.. which can change behavior (and 3rd party security software, if using such)
- so, covering basics, have you checked Ethernet switch and camera firmware?
- check real-time hardware resource utilization monitoring on OBS Studio PC (ie RAM, CPU, GPU, disk and network I/O), making sure there aren't some new background tasks taking up some otherwise needed I/O
easy to test by pointing all 3 cameras to same video source and run time sync check tool/video.. I use https://streamgeeks.us/fix-audio-sync-issue-in-obs/ running on a tablet or laptop
What connection are you using for the cameras - SDI, USB, HDMI (with capture device), NDI?
How is audio connected to OBS Studio PC? analog, USB, Dante?
if cameras aren't staying in sync with each other, I'd contact PTZ Optics for support
As for the dedicated switch: PoE?
is that switch/cameras on an isolated network segment (ie VLAN, or otherwise)?
I'm all for not fixing what isn't broken, but in the case, Operating System and driver updates have taken place (by default) automatically over the years.. which can change behavior (and 3rd party security software, if using such)
- so, covering basics, have you checked Ethernet switch and camera firmware?
- check real-time hardware resource utilization monitoring on OBS Studio PC (ie RAM, CPU, GPU, disk and network I/O), making sure there aren't some new background tasks taking up some otherwise needed I/O
Thanks. They are not in sync with each other. Sometimes one camera will be off. If I go in and settings on a camera and hit source timing it will cause the camara to pause, then will be in sync. Most of the time for the rest of the recording, but recently it can go south again. We are using NDI exclusively. I have 3 PTXOptics cameras, all the same, all on the latest firmware. I have another PC that outputs NDI from our powerpoint that drives the projectors. Audio comes through a Audio96 conversion box coming into the pc as USB. Also I tried recently to make the Live Stream PC a time server and point the 3 cameras at it. Thought that was the fix, but last night it was off again.
I am not really sold on the switch. I have it in the AV booth and everything in the booth comes off that one switch. It is a Ubiquity 16 port 1Gig POE. I wonder if I need a 4 Gig Switch? I have no VLAN's. When I am having issues, the pings between the PC and the cameras are 1ms or less. Thanks for the idea of talking to PTXOPtics telling them that the cameras are not in sync. I will try that.
Lawrence_SoCal
Active Member
first question would be whether PTZ Optics cameras use network NTP to begin with? Usually one needs to set NTP on DHCP server
3 NDI feeds, plus NDI fed of PPTx.... do you have an overload (CPU and/or GPU) on OBS Studio computer?
As for 1Gbe switch... should be fine, depending on NDI feeds and other traffic. I'm guessing network monitor on OBS Studio computer will show much less than 1GbE incoming traffic from the 4 feeds, right? That PoE switch isn't overheating, hopefully (unlikely, but possible)
A question for PTZ optics is what would cause cameras time sync to drift? for example, if you have option of regular NDI vs NDI HX (high compression) could it be the camera CPU getting overwhelmed with your settings? My Panasonic PTZ NDI camera has option for multiple video feeds. I made sure to disable the one I'm not using
And what about firmware updates for cameras?
3 NDI feeds, plus NDI fed of PPTx.... do you have an overload (CPU and/or GPU) on OBS Studio computer?
As for 1Gbe switch... should be fine, depending on NDI feeds and other traffic. I'm guessing network monitor on OBS Studio computer will show much less than 1GbE incoming traffic from the 4 feeds, right? That PoE switch isn't overheating, hopefully (unlikely, but possible)
A question for PTZ optics is what would cause cameras time sync to drift? for example, if you have option of regular NDI vs NDI HX (high compression) could it be the camera CPU getting overwhelmed with your settings? My Panasonic PTZ NDI camera has option for multiple video feeds. I made sure to disable the one I'm not using
And what about firmware updates for cameras?