The put.io Google/Android TV app is pretty decent, as long as you don’t have to reencode content.

Let me throw my seedbox into the ring. :)

You don’t have to convert to mobi anymore. The Kindle backend supports epub for a couple of months already. I’ve also read reports that Kindle’s can now convert ePub by themselves if you copy ePub files via cable but I haven’t verified that myself.

Can confirm, though it’s unlikely to be some piracy check. The epub just has a couple of errors that might make it difficult for Amazon’s server-side epub parsing implemention:

$ epubcheck ~/Downloads/nietzsche-a-guide-for-the-perplexed-r-kevin-hill--annas-archive.epub
[...]
ERROR(RSC-005): ./Downloads/nietzsche-a-guide-for-the-perplexed-r-kevin-hill--annas-archive.epub/index_split_003.html(172,403): Error while parsing file: element "blockquote" incomplete; expected element "address", "blockquote", "del", "div", "dl", "h1", "h2", "h3", "h4", "h5", "h6", "hr", "ins", "noscript", "ns:svg", "ol", "p", "pre", "script", "table" or "ul" (with xmlns:ns="http://www.w3.org/2000/svg")
ERROR(RSC-005): ./Downloads/nietzsche-a-guide-for-the-perplexed-r-kevin-hill--annas-archive.epub/toc.ncx(62,42): Error while parsing file: playOrder sequence has gaps
Check finished with errors
Messages: 0 fatals / 69 errors / 0 warnings / 0 infos

Unfortunately I couldn’t find any other epub versions. Though I just discovered the Kindle ePub fix project and converted the ePub to a fixed version using the en language tag. That seems to work because the book just showed up in my Kindle library. :)

Can’t reproduce on the most recent stable version of Brave on Android 13 (Pixel 7 Pro). Tried multiple mirrors on Anna’s Archive.

I can’t recommend the Google TV/Chromecast if you have to interact with multiple apps or plan on using the Discover screen or search. The remote is finicky and feels cheap and the device itself is totally underpowered for Google TV. Its Amlogic SoC is slow as fuck and often drops frames and the 2GB of memory are barely enough to keep the bloated interface in memory while the storage is often full even after just installing a few apps. It has gotten a bit better after even Google had to admit that performance was abysmal but the optimizations just fixed the most obvious shortcomings.

I have sinced unsubscribed from all streaming services and just rely on the put.io app on Google TV to handle my media consumption needs and it is good enough for that. So if you just need the Stremio app (which I haven’t used myself) to access local content, you should be fine. I never saw it struggle with 4k HDR content nor did I encounter A/V sync issues.