VLC has its own settings for speaker outputs, first make sure those are right, then you can use Audio Midi Setup to configure the speakers using your own output as well. I'd start in those two places.

We’ve been waiting a long time for a major update to VLC for Android, and v3.4 might not seem like it at face value, but it adds a number of important tweaks and improvements to the popular ...

VLC Media Player for Android, Windows PC, and Apple Mac can cast videos and audio to any Chromecast-enabled device. When watching a movie on VLC, you can stream it to a Chromecast-connected big-screen ...