I have two problems.
1. The videos I play on my cell phone while WiFi connected to the 70mai all have sound. When I take the chip out of the camera and put it in my computer none of the videos have sound.
2. I also can not find the album where I have down loaded the videos to the cell phone. They are not on the chip nore in the phone.
Download and install this:https://codecguide.com/download_k-lite_codec_pack_standard.htm
And you will have sound.
That is a chrome extension. I have my files associated with movies and TV and/or windows media player. Still now sound. Thanks!