no audio when playing avc1.4d401f (136) / mp4a.40.2 (140) videos

Everything works very fine on my hackintosh, I've been using it for almost a year now for video editing and post production stuff.

What really bugs me is that I get no audio out of a very few videos, including some youtube videos like this one:

https://www.youtube.com/watch?v=f4rPDF993qs

which has these codecs: avc1.4d401f (136) / mp4a.40.2 (140)

Any idea on why this happens and how to manually install the right codecs?

Thanks!

submitted by /u/iacopob
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