Audio-audio sync problems

[juef]

Greetings,

I plan to stream a musical performance based on a hour-long video and a 5 minute video. The videos contains backing tracks and visual cues for song starts, and is set as a media source for the stream's main scene.

The problem is that I cannot get proper audio sync between my instrument (bass going through a Steinberg UR12) and the backing tracks from the video. The bass has a slight input delay (something like 70 ms), which I attempted to compensate by having two sources for my video in OBS: one for monitoring only, and one (with an intended delay) for output only. This worked okay… until some unknown thing (disk / cpu hiccup?) happened during a test recording and nothing was even close to being in sync anymore (1+ second delay). Plus, the amount of delay I needed to use for each video seemed to be different and required a lot of testing to sound okay.

I can certainly make the song start cues part of the audio, but I'd still need two sources to compensate for the bass input delay… which brings me back to the same problem.

I am running out of ideas and would very much appreciate any kind of input! Thank you!

 

[juef]

Ohhhhhhhh and I just learned that you can actually set a negative amount of time in "Sync offset"?! I'm guessing doing this for my instrument will make everything fine both on my end and the stream itself, but I'll test it tomorrow to make sure.

I'm still very much open to other suggestions, should anyone have other ideas. Thank you.

 

[khaver]

What you can try is taking the line-out from your computer into a direct box and into the UR12 XLR input. Direct the audio from the video to the computer line-out. Plug headphones into your UR12 and use the direct monitor to hear both the audio from the videos and your bass. In OBS do not use the audio from the video files. Instead use only the audio from the UR12 in your scenes. Note: this will only provide mono audio.

 

[juef]

I intended to use the XLR input for a mic at some point during the stream, but this certainly sounds like a great idea, and should it work, I will gladly forego the mic! Thank you very much for the suggestion, I really appreciate it!