Transcoding? It's the process of converting an audio or video file from one encoding format to another so media files can be visible on different platforms and devices. On PeerTube, we use the FFmpeg program to transcode the videos you upload. You probably have noticed the warning message when you post a video saying "This video is being transcoded, it may not work properly yet". In fact, until transcoding is complete, your video may not be seen from all your devices.