Based on available technical documentation, "AV4" commonly refers to the Crestron AV4
: Connect the chassis ground lug to a known earth ground. Plug the unit into a 100–240V AC power source using the provided IEC cord. av4 us video install
On Android or iOS, VLC also offers mobile apps that support a wide range of video formats. Based on available technical documentation
Common pitfalls and troubleshooting