I can confirm for you:
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Hardware transcoding (without HDR tone mapping) is natively available on DSM 7 for Intel x86_64 processors (J3355 and above).
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Be certain to enable both transcoding options
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If you opt to use the Docker container overlay method (to layer Docker PMS on top of your native package), The J3455 and above CPUs will support HDR → SDR tone mapping.
