Based on our record, Google Cast SDK seems to be more popular. 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.
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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