Still having trouble with audio on Macbook Pro

I had posted a discussion board earlier on this issue. I've been having trouble with audio for certain videos on youtube and basically any website embedded with a video. The audio works for a few seconds that doesn't or it doesn't work at all. My volume is up, not on mute, and the one on the video isn't on mute either. It's funny because I just tried watching a video on Firefox (as opposed to Safari) and it works. Could it possible be something with the settings for safari?
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Try restarting your Mac, resetting your router, and resetting your modem. My cable internet has gotten slow at times as well, and when I reset my router everything cleared up.