I am working on building my own on-demand video delivery (hosting/transcoding/streaming) platform. I looked for an existing open source alternative but couldn't

I am working on building my own on-demand video delivery (hosting/transcoding/streaming) platform. I looked for an existing open source alternative but couldn't find any. Either there are proprietary options (wowza etc.) or you go with providers such as Wistia, Vimeo etc. that are great but limited when it comes to fully customizing what you want. If I am happy enough, I will open source it :)