Michael Collins from JW Player discussed best practices for making mobile video marketing more effective. He explained that mobile video viewing is increasing and adaptive streaming can help by downloading video in chunks to allow for skipping around and reduce buffering. Responsive design is also important to allow seamless viewing across devices. Tracking key performance indicators and running A/B tests can provide insights into optimizing elements like video length, calls to action, and ad placement. Social sharing features and branded experiences can help increase engagement as users switch between devices.