A walkthrough they can watch but never touch

Month-end review with the client. You could send the workspace URL in read-only mode, but a URL to a live session is still a door: one they hold after the call ends. Instead, ffmpeg captures the display into a pipe, and the client opens ?video on whatever screen is nearby while you talk.

They see every number you scroll past, live. They cannot click, cannot type, cannot come back tomorrow: the stream ends the moment you stop sending, and there is nothing left to revisit.

Screen-sharing normally means a meeting platform, an install, a calendar invite. This is a URL that works for exactly as long as the walkthrough does.

The view expires with the conversation; the key never left your pocket.