In reply to zimpara:
> Thanks! What is this codec, is it inside the camera and unchangeable?
Codecs are what convert the data into something that we can see and hear. Some examples are divx,xvid, mp4, H.264, H.265, MP2.
Ever downloaded a movie off the internet with some weird file system like MVK. You could see the movie but could not hear it. This most probably was because your computer or media software did not have the right codecs. Microsoft try to sell the codecs to you while software like VLC are free and can cope with just about any codec you throw at them.
A cheap action-cam may use a propriety codec that very few can read. Wile other cheap action-cams are cheap for a reason, as in they may have the components such as a sensor, lens and storage but not enough processing power to cope with the expectations of the person who bought the action-cam.
Saying all this not all cheap action-cams are rubbish. With a little research you can get an action-cam to go toe-to-toe with aGoPro.
http://www.techmoan.com/blog/category/action-cameras