We encountered an issue when playing videos with DRM on HE-AAC audio (Smooth). No audio heard. Same video plays ok on earlier firmware version.
HLS (no DRM) on HE-AAC plays ok with audio.
NOTE: DRM IS PLAYREADY
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What Roku device are you using?
4630X - Roku Premiere+ (9.2.0 build 4131-29)
4660X - Roku Ultra (9.2.0 build 4131-46)