I did this too, I have pi that downloads and combined a bunch of rss feeds every 30min (cron) and downloads the vids, I browse them with Thunderbird on my desktop, I inject a special link to the mp4 on my pi. So I can just watch vids at 192.168.1.106/videos/X.mp4 using the Firefox mp4 player.

Did it in ~300 lines of node.js, was trying to learn how to use JS for server stuff, seemed like a good idea at the time. It still works 5 years later, but it stands as a reminder to me to never use async/await.