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Roku Streambar Pro will not play audio from Ultra HD 4k disc

I have a Streambar Pro, Sony 4k TV, and 4k DVD player. First, note that other than the Ultra HD disc, all other content (dvd / streamed programs / TV programs) plays perfectly.

I have checked that all devices are updated. The disc I mention will play if I use the TV speakers. The previews etc on this disc also play fine - it goes silent when the movie begins. The HDMI cables are high-quality (both the DVD-to-TV, and TV-to-Roku).


I contacted Sony support, and they state their products' settings are correct.

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