Given BeeStation, with the same J4125 CPU can do HW transcoding and the DS425+ cannot, both also with the same 5.10 kernel but different firmware, seems to indicate this is a Synology product/marketing driven decision.
Given BeeStation, with the same J4125 CPU can do HW transcoding and the DS425+ cannot, both also with the same 5.10 kernel but different firmware, seems to indicate this is a Synology product/marketing driven decision.