Based on our record, Google Cast SDK should be more popular than VIXY video. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I'm currently working with a client that uses Vixyvideo (vixyvideo.com) for their Video embeds. All though they have more control over the layout of the embeds, it's hard to optimize the videos for Google. I can add some meta- and structured data, but the videos won't show up in the SERP's like Youtube videos do. Source: almost 3 years ago
Fairly sure that's how the Chromecast SDK works. That will cover a good amount of ground for you, as many modern TVs are chromecast targets. Source: about 2 years ago
But I don't believe Fire TV supports Casting (the specific Google-developed protocol that Chromecast and other devices support). Source: over 2 years ago
This might help: https://developers.google.com/cast. Source: about 3 years ago
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