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OLED 55C7T is not supporting atmos in truehd container when playing from Hard drive after firmware update


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This is because the TV outputs audio via ARC, or its internal speakers + Optical. Neither of those methods supports TrueHD or any lossless audio. ARC only supports DD+ with Atmos metadata, and Optical won't support Atmos in any form. Your option would be to find a device that connects to your receiver by HDMI, like a 4K Blu-Ray player, which can play media files from an external drive. Or, y'know, buy the movies legitimately.

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7 hours ago, hellojavad said:

@Cody k TV supported and played this metadata from time I bought TV  but problem showed up after firmware update.

That sounds unlikely. I've had a C7 for eighteen months and it never supported lossless audio. The TV does not have and never had a transcoder for those codecs. 

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