For testing I simply added the embed iframe into both
a) the basic overwolf demo app, just in the html
b) replaced our iframe player with the same embed code (in a template of a single file component in a more complex vue app)
Result:
Sound is hearable in a) but not in b)
With native video tags, there is no issue with the sound.
On the visual player within the iframe, it was not muted and volume on full.
Generally speaking, it’s usually preferrable to use mute_excluded_hosts instead, since mute must stay true if you want to display ads in that window. Plus, with sound being potentially disruptive, it’s always better to have it be an opt-in