MQA have/had many different aspect and suffered from bad presentation, mainly from its creators and a lot of misunderstanding of how it works and what level of applications can have. To simplify, it is/was lossless in audio band and lossy for the ultrasonic part. Since Tidal dropped MQA by long time ago and its use for HD masters derived and replaced them with original HD Flacs, this kind of application it's no more significant.So did I, then went back to Qobuz.
I still don't trust Tidal.
MQA was also applied to CD quality masters and delivered with 44.1KHz 16bit MQA files. In this case, the one recalled by video you post, MQA encoding was just a file flag telling to dac to use custom MQA upsample to 88.2KHz and antialias filter, just another type of dac filter, and the PCM part is identical to normal CD Flacs.
Since this equivalence, there wasn't any reason to completely replace files. Tidal removed just flag but some DAC, like the BluOS ones, still recognize the former MQA structure and activate upsampling and custom antialias filter.
Like it or not, I find that the topic of MQA is generally treated superficially, as in the video reported.
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