After considering various possibilities and searching for related terms, "vpn视频专线" could refer to either a less common term in the context of VPNs, potentially related to video technology or a specific VPN service offering video conferencing or streaming capabilities. Without more context, it's challenging to provide a precise definition. However, it might be a VPN protocol like "VPN视频" or a software tool for video calls and streaming. For a precise answer, additional context or clarification would be beneficial.