I had the same problem with videos on FB2Mate too.
It may be the jack that is the problem. To be sure, try the headphones in another device. If they work fine, it is the jack. If they don’t, then obviously (new pair or not) the problem is the headphones.
Now if it turns out to be the jack you have basically two ways to resolve it. 1. You can yourself, or by taking it to a tech, have the jack repaired (if possible) or replaced. 2. You can get yourself a 3.5mm to USB adapter and run it through a USB port instead.
