[londons_explore]

Alternate/hacked YouTube apps exist that you can install on your TV that won't show ads...

Also, if you cast stuff to the TV, you only need a modded version of YouTube on your phone - you don't need to make any changes to the TV.

[brbsix]

YouTube Vanced[1] for Android is awesome. It supports background playback and allows you to block all ads as well as community posts, surveys, premium movies, and just about anything else. They recently integrated SponsorBlock[2], which allows you to block in-video intros, outros, sponsored sections, and subscription reminders.

However it uses microG, which has long had an open issue with v2 of Google's Cast API. The issue was recently closed however I don't believe it was solved. However it is still possible to work around this. I ended up writing a quick script on my phone that uses pychromecast to initialize the cast so that it can be passed off to YouTube Vanced.

It's been a while since I've cast anything but are you certain that ads are blocked when casting from an app that blocks ads? In my experience with casting, the video is always streamed directly from the content provider's servers (YouTube) to the cast receiver (smart TV) with ads intact. You would need to mirror your phone's display in order to block ads.

[1]: https://vancedapp.com

[2]: https://sponsor.ajay.app

[3]: https://github.com/microg/GmsCore/issues/79

[londons_explore]

Casting from YouTube vanced is ad-free. Not sure how it does it - perhaps by immediately fast forwarding the ads

[2OEH8eoCRo0]

Newpipe on Shield TV.