Can’t render WAV in runtime

Hello!

I have a problem with rendering stuff. I’m trying to render a sequence in runtime with using blueprints. Output should be .mp4 with audio.

In-editor movie render queue works fine, but in my case, I need it to work at runtime.

I’m aware of runtime render limitations (it can’t output WAV).

I tried to use NewProcessExecutor (because it has the -determenisticaudio -audiomixer parameters which are required for WAV output). but it doesn’t work because it gives this error:

One or more jobs in the queue have an unsaved map as their target map. These unsaved maps cannot be loaded by an external process, and the render has been aborted.

I don’t know why this error is coming out, I tried re-saving the level, and building the level, still doesn’t work…

I also tried to use InProcessExecutor, it works, but it renders without audio…

Could you help me to solve this issue? Thank you!