Instapod is as simple server that lets you add listen to YouTube videos in a podcast player. It uses youtube-dl to fetch the video and convert it to audio, and then serves the files as a podcast feed.
On first run, the server will generate a config file at ~/.instapod/config.json. Update the Title and Description fields to your liking and BaseURL to point to your server. You should also set Link and ImageURL so that you have a link in your metadata and nice album art for your feed.