You have not mention what Operating System (OS) you are using on you Computer. If you are on Windows OS, most probably you have not installed the required AV "codec" to to be able to play the audio formats from your video files. Different recorded videos from different manufacturers video recorders use a varities of AV(Audio/video) formats due to copyrights protocols.
For Windows OS, you can download & install the latest codecs ie. "K-Lite Codec Pack" or "K-Lite Mega Codec Pack" which will play most of the AV formats.
In addition to the above if you wish, you also install a free versatile media player like VLC player too.
Hope it helps & happy viewing with audio & videos.
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