Hi - thanks for your message
The audio might not play correctly on these files as it looking for a codec on your machine (for example: an AC3 audio codec) which is not installed.
I would recommend closing down trakAxPC and then installing the FDDshow codecs* onto your machine: You can download them at: http://www.free-codecs.com/download/FFDshow.htm
Once these codecs are installed on your PC, reboot your machine and trakAxPC should be able to read the video files correctly.
I hope this helps and please contact me if this does not work and we can look into this further for you.
*You can also download these codecs from Softpedia (http://www.softpedia.com/get/Multimedia/Video/Codec-Packs-Video-Codecs/FFDShow-MPEG-Video-Decoder.shtml) - 100% Clean and Tested.