What method is generally used for local ad insertion in video content delivery?

The method generally used for local ad insertion in video content delivery is managed by a video server. Video servers are specifically designed to handle and deliver video content, including the insertion of advertisements into streams. They can dynamically manage advertising slots, facilitating the replacement of national advertisements with local ones based on geographic targeting or time.

This ad insertion process allows for several advantages, such as the ability to provide relevant advertisements to viewers based on their location, enhancing viewer engagement, and potentially increasing ad revenue for broadcasters. By leveraging the infrastructure of a video server, content providers can ensure that ads are delivered efficiently and in sync with the primary video content, maintaining a seamless experience for the audience.

While other options involve various technologies used within the broadcasting and content delivery ecosystem, they are not specifically focused on the role of ad insertion. A content delivery network primarily handles the distribution of content over the internet but does not manage ad placements directly. Cable modems and satellite links are involved in the transmission of video signals but do not actively manage ad insertion. Therefore, the video server is the most relevant and capable method for executing local ad insertion effectively.