Just make sure to verify how much space these hold before actually using them

As someone else said, this almost always comes down to the device they’re using. Especially if it’s a Playstation console or a Smart TV (in my experience) as they don’t support x265 codec or have .ass support, or both

Are you after wireless or wired earbuds? And what kind of music do you generally listen to?

It’s ads from OpenSubtitles baked into subtitle file. You can pay for a premium account to remove the ad messages I think