This is the first time I have ever experienced this issue using Google Chrome browser. When viewing any type of Flash videos I would hear static in the audio. I realize that there is a Google Chrome alternative within Linux Mint called Chromium, and I have been using it for the past couple of years. However since Google changed to Hangouts and created a Chrome extension that I use all the time I found that it doesn’t work in Chromium so I use Google Chrome exclusively now. Oddly enough, this Flash audio static doesn’t exist in Chromium.
I found a fix on the Google Chrome forum here. Basically, within Google Chrome, in the URL area go to chrome://plugins/. Once there look for the Adobe Flash plugin. You will need to select the Details option to see every detail of the plugin. Disable everything within the plugin except for /usr/lib/flashplugin-installer/libflashplayer.so. For me I only had to disable /opt/google/chrome/PepperFlash/libpepflashplayer.so.