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You can actually stream the file directly to the chromecast as it's transcoding.

I've got this working in my own chromecast app mkvcast: https://github.com/maherbeg/mkvcast

See https://github.com/maherbeg/mkvcast/blob/master/lib/controll... for the parameters to use.

I got something similar working in Java by simply exec'ing ffmpeg and getting a handle on the stream. Not being able to seek kind of sucks, and Chromecast does not like infinite streams. However, I've seen that he Chromecast will actually stream some MKVs just fine (so long as the underlying codecs are supported).

Thanks for the reference! This looks like just what I need.

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