Lost audio in live stream when changing scenes

[Amy_UCBR]

Problem: We just upgraded to OBS 26.1.1 on Thursday 1/14/2021 and did when we did the next live stream (of our church service on 1/17/2021) we did not have audio on certain scenes in the live stream. We are using mulitple scenes during the service, one for each part of the service. We have a scene for the pre-service with no audio and that worked fine, then a "Main" scene for the majority of the service (that worked fine), and then a different scene for the various music portions; one for the prelude, hymn1, hymn2 etc. When we went to the music related scenes the audio showed everywhere from start to live stream computer, but was not in the actual live stream. (see symptoms below). If we went back to the "Main" scene the audio worked. We have been using OBS with multiple scenes since November and this is the first time we have had problems with losing the audio. Wondering if we should go back to the previous version, 26.1.0.

Setup: We have an Allen and Heath sound board connected to a BlackMagic switch, connected to an SDI to HDMI converter, connected to an HDMI to USB converter, connected to a desktop computer which is where the OBS is located and from where we do the live stream.

Symptoms: We could hear the audio on the Allen and Heath headphones and in our radio broadcast (sent from the Allen and Heath). We could hear the audio in the headphones on the BM switch and could see the audio. We could hear the audio in the headphones connected to the desktop computer and the auidio feed in OBS was showing the audio to be present.

Tried: we tried to turn on/off the audio source, no success. Didn't know what else to try during the live service.

I am at home and the computer is at church. I will get the log files and post them tomorrow. Any help will be greatly appreciated.

 

[Amy_UCBR]

Here is the log file from the live stream where experienced the issue

 

[Lawrence_SoCal]

I've been using OBS for HoW streaming since last Mar/April, and I'm at over 25 scenes, switching back and forth (usually) from pre-recorded videos to live audio/video. I initially tried re-using scenes, but found it was too easy to get distracted and make a mistake. So my scenes are in service order. I don't use ANY of the global/default OBS audio sources. In each scene, I only have the either the sound panel (currently plugged in via analog 3.5mm TRRS connection, soon to be USB so I can mix the channels separately from house mix) OR the pre-recorded video (which has its own audio, no need for house audio). With no-one in-person, the muting of house mics during pre-recorded video is a benefit (had mistakes earlier on with accidental live mic)

That is an old PC. I tried a gaming laptop, 1 generation newer than you PC and failed (so we got a new PC). so congrats on having you setup working at all. You are creating extra GPU/CPU load (I think) by re-scaling from base canvas of 1080p to output resolution of 720p. Since streaming to YouTube, any reason to not stick with 1080p? or is a bandwidth issue?
And why are you using 60fps? unless doing slo-mo, you'll lower your load on the PC by dropping to 30 fps

I see liturgical based setup... same here. Our videos include preludes, postlude, announcements, readings, Psalm, etc then multiple scenes for opening (initial thumbnail scene for a few seconds, countdown scene, replay prelude scene (fill time as we start livestream 10 minute in advance of service to give people time to connect. Could probably drop to 5 minutes now... but folks enjoy the extra music. We also have a walk-up video for a reminder of the physical space, and includes service starting bell chimes. Each week, I generally simply replace last week's videos with this weeks, adjust video framing and service bulletin as appropriate. Using Advanced Scene Switcher, I've automated a lot of the scne changes (from timed at the beginning, to scene change after pre-recorded video ends, and specific timed sequence as service ends (coffee hour, copyright notice, etc)

I upgraded from v 25.0.8 to v26.1.1 this week with no issues (so far.. fingers crossed)
Why the convoluted audio path? just curious
If you could hear the desired (sound panel) audio on the OBS PC, did you check Advanced Audio Properties and make sure something didn't turn off Output? As I have sound panel directly plugged into OBS PC, and am in same room, I've set Sound Panel Audio Input to be Output only (no Monitor)
08:33:59.418: - scene 'Epiphany':
08:33:59.418: - source: 'Radio Feed' (wasapi_input_capture)
08:33:59.418: - monitoring: monitor only

 

[Amy_UCBR]

I've been using OBS for HoW streaming since last Mar/April, and I'm at over 25 scenes, switching back and forth (usually) from pre-recorded videos to live audio/video. I initially tried re-using scenes, but found it was too easy to get distracted and make a mistake. So my scenes are in service order. I don't use ANY of the global/default OBS audio sources. In each scene, I only have the either the sound panel (currently plugged in via analog 3.5mm TRRS connection, soon to be USB so I can mix the channels separately from house mix) OR the pre-recorded video (which has its own audio, no need for house audio). With no-one in-person, the muting of house mics during pre-recorded video is a benefit (had mistakes earlier on with accidental live mic)

That is an old PC. I tried a gaming laptop, 1 generation newer than you PC and failed (so we got a new PC). so congrats on having you setup working at all. You are creating extra GPU/CPU load (I think) by re-scaling from base canvas of 1080p to output resolution of 720p. Since streaming to YouTube, any reason to not stick with 1080p? or is a bandwidth issue?
And why are you using 60fps? unless doing slo-mo, you'll lower your load on the PC by dropping to 30 fps

I see liturgical based setup... same here. Our videos include preludes, postlude, announcements, readings, Psalm, etc then multiple scenes for opening (initial thumbnail scene for a few seconds, countdown scene, replay prelude scene (fill time as we start livestream 10 minute in advance of service to give people time to connect. Could probably drop to 5 minutes now... but folks enjoy the extra music. We also have a walk-up video for a reminder of the physical space, and includes service starting bell chimes. Each week, I generally simply replace last week's videos with this weeks, adjust video framing and service bulletin as appropriate. Using Advanced Scene Switcher, I've automated a lot of the scne changes (from timed at the beginning, to scene change after pre-recorded video ends, and specific timed sequence as service ends (coffee hour, copyright notice, etc)

I upgraded from v 25.0.8 to v26.1.1 this week with no issues (so far.. fingers crossed)
Why the convoluted audio path? just curious
If you could hear the desired (sound panel) audio on the OBS PC, did you check Advanced Audio Properties and make sure something didn't turn off Output? As I have sound panel directly plugged into OBS PC, and am in same room, I've set Sound Panel Audio Input to be Output only (no Monitor)
08:33:59.418: - scene 'Epiphany':
08:33:59.418: - source: 'Radio Feed' (wasapi_input_capture)
08:33:59.418: - monitoring: monitor only

Thank you for the information.
We have changed the video to stay with 1080p and we changed to the 30 fps, thank you for the suggestion.
The audio path might seem convoluted, but we are using the BlackMagic (BM) switch to gather the audio and the input from 5 cameras (could be up to 8 but we only have 5), and the output on the BM switch is SDI so we have to that output converted to be USB for the input on the streaming computer.

One setting we did change is on the Advanced Audio Properties of the "Radio Feed" source (the audio source from the Allen and Heath sound board to the BM switch) in the "Audio Monitoring" setting it was "Monitor Off" and we could not hear the audio in the headphones of the streaming computer. So we changed that to "Monitor Only (Mute Output)". We have changed it to "Monitor and Output". The funny part is with the "Monitor Only (Mute Output" it worked in one scene (the Main scene) but not the other scenes when the setting is a global setting. We did a test with the new setting "Monitor and Output" and it seemed to work on all scenes so hopefully it will work tomorrow. Can you tell me what that setting is really doing (what it is really controlling)? And why it would work in one scene but not others?

We do some of the same things you are doing but haven't really done and videos with audio because we don't know how to get the audio back to the live feed to the broadcast on the radio station. The live feed for the radio station broadcast comes out of the Allen and Heath sound board to a cell phone and then sent to the radio station through the cell phone.
Appreciate your help.

 

[Lawrence_SoCal]

In Advanced Audio Properties
- Monitor means being able to hear audio on OBS PC. Output means sending that audio signal out to Record/Stream

Sources (be that Audio, video or other) can be added individually per scene, or added once, then copy/referenced in other scenes (meaning change in one scene will impact other scenes.. though depends on source type and exact change as to whether visible/audible in other scenes)... so depends on how EXACTLY you added/setup your sources that may explain the behavior you saw

The audio path might seem convoluted, but we are using the BlackMagic (BM) switch to gather the audio and the input from 5 cameras (could be up to 8 but we only have 5), and the output on the BM switch is SDI so we have to that output converted to be USB for the input on the streaming computer.

I don't have/use a BM device, so take that into account. But your answer doesn't explain to me (might be obvious to others) why running audio into BM?

I've recently helped another church. Being recently unemployed (and very much liking not working for that company), I have spare time ... so I help out (hopefully that is what I'm doing) on this forum. Direct message me, and I'm happy to set up a web conference call and spend a little time helping out. I'm not a touch typist, so talking is a much faster way for me to help out than typing this... so I don't mind, especially when helping out for HoW

Interesting in regards to radio station. Presuming you want to add content to your service from the PC (ie coming from sound board), you'll have to decide:
- route final OBS composited audio back to sound board for transmission (most likely require learning to use sub-mixes)
- of take audio from OBS PC and send that to radio station
If you don't have in-person worshippers, then sending extra audio to in-house speakers is probably a non-issue. But if planning for what future normal (what we call) 'hybrid' service with both in-person and live streamed service, there gets to be some interesting audio routing questions/decisions to make if source audio is not ONLY that picked up via Mic/Sound Panel (ie videos or other content on PC) ... interesting in sense of avoiding audio loops/echos, etc, as well as most likely need for slightly different audio mix for in-person vs remote users (something you may have already address for radio broadcast)

*IF* you don't want more help from me (or others on this forum, most likely), what would probably help is a very clear audio routing drawing/diagram, and associated OBS source naming. And sound panel setup/advise will depend on exact model, and how connected.

 

[vdjzen]

I have been facing the Exact problem recently...happened while streaming to youtube / vimeo and also the NDI output from the OBS... when switched the scene, the audio worked perfectly...this seems like a bug. coz it happened in two different machines, on two different occasions with diff contents...Audio Sources are fine, only Video Files having this issue. both running in the same 26.1.1 ...its impossible to replicate the issue, coz it is jus random. the same scene jus works fine after a while without any changes or by closing and reopening OBS fixes it....anyone else facing the same issues??