Slight audio delay

[llucac26]

Hello, I've been wondering if this plugin was known to have a slight delay compared to standard OBS audio capture ? Basically any sound going through the plugin is a few ms behind OBS' default Desktop Audio track, and playing with sync offset in the advanced audio properties doesn't do anything on the plugin source. I've not seen anybody having this issue, so maybe it's on my side but I don't know what I could do to fix it

[ngraham20]

You're not crazy, I am also experiencing this. It's slight, and it probably won't make too much difference, but it's there.

[ngraham20]

Ok, if you go into OBS, you can set the audio delay to between -8 and -10ms for the application audio, and for me, that re-aligned the audio.

[llucac26]

-8 indeed gave me good results, thanks !

[Tignus]

Actually, you can mesure this delay :

• Setup 2 audio sources in your OBS mixer, one for desktop audio, one for your web browser
• Setup the default Windows audio output on a device (for example your headset) => You will hear 1 pop here
• Setup the monitoring output on another device (for example your speakers) => You will hear the delay with a double pop here
• Play a very clean "pop" sound, for example this Youtube video of a metronome
• If your monitoring is setup correctly you will hear a double "pop" instead of only one. For me it only worked with the speakers as the monitoring, not the other way around. Something with OBS preventing audio loopback or something.
• You can now record this clear double "pop" with Audacity using your streaming microphone
• Zoom in on a double "pop" zone and use the Select tool to mesure the duration between the two "pops"
• Repeat on other zones if you want a better average

For my setup, this process mesured the delay to 8.6ms

I believe this delay is inherent to any audio processing and you can't do much about it except add the offset correctly in the advanced audio properties.

Does that mean that all audio will be delayed by 8.6ms on the video captures ? Should a 8ms delay filter be added to every video capture source ?

EDIT: Another way of mesuring the delay is to record your own voice over the metronome video while changing the offset and enumerating the value (the offset is applied live). "Minus 7", wait several bips, "Minus 8", wait, ..., repeat until whatever and then listen to the recording to select the best offset for you.