This plugin is created for Ssam to export mp4 videos by using ffmpeg on the server side.
npm i -D vite-plugin-ssam-ffmpegIf you create a Ssam sketch using
npm create ssam@latest, this plugin is already set up for you.
When the plugin is loaded, it will first check ffmpeg is available on the machine. When mp4 recording is initiated from Ssam (client side), the ssam:ffmpeg message is sent to the plugin. The ffmpeg process is spawned and image2pipe streaming is setup. The plugin then waits for ssam:ffmpeg-newframe message, which will be written to the output video. It then sends ssam:ffmpeg-reqframe to the client and this will go on until there's no more frame to be recorded. The client finally sends ssam:ffmpeg-done message to the plugin which will finalize the encoding process.
To not overwhelm the encoding process, newframe and reqframe cycle is used. Otherwise, the speed of the client sending new frames will clog up the stream.
MIT