In all likelihood, it has to do with an audio codec issue.
1) Download and install codec packs:
For Windows – https://codecguide.com/download_k-lite_codec_pack_mega.htm
![In all likelihood, it has to do with an audio codec issue. Download and install codec packs](https://nimbusweb.me/images/klite.jpg)
For MAC – https://perian.org
![Download and install codec packs](https://nimbusweb.me/images/perianmac.jpg)
2) After installation, reboot the system.
3) Try playing the video again.