OS 10.12.6

I downloaded a few movies and there is no audio. I have VLC as my default. I tried playing a couple more and noticed that quicktime player was used and the audio was fine. I also noticed that QT was my default although I never chose it. How did this happen? Is it because I now have sierra? Can I revert back to VLC and regain the audio?

jaybass


OS 13.6.6 iMac (Retina 5K, 27", 2017, 3.4 GHz Intel Core i5, 24 GB RAM, 2400 MHz DDR4. SuperDuper. 1 TB Lacie HD