So yeah, I would bet my money that atmos metadata is just a blob that can be taken from MLP frame and inserted into DDP frame, providing frame sizes and channel configuration is the same. Code complexity - like any codec, similar to decoding an ac3 frame. So, with current knowledge, even the "impossible" task of converting double-layer FEL to single-layer MEL looks quite doable - not as trivial as prefixing a byte, but not an impossible task either - decode EL layer, render data, encode coefficients back with MEL parameters, profit.
And with Dolby patents released in December 2019 we now know entire DV RPU structure - MakeMKV currently detects MEL and FEL streams, and to do so it parses 90% of RPU unit. Outcome? Converting from double-PID to single-PID is a matter of prefixing a single byte per packet. Originally Posted by acejh1987 /t/1476817/why-does-blurays-have-mu.tell-which-one-is-the-valid-onepost23418623 Yes, I can confirm just picking the first large file or track in MakeMKV will not work with Screenpass protected titles, the scenes will be completely out of order and unwatchable. For years(!!!) we have discussed what a complex job would be to convert DV streams and how million dollar software and NDA specs are required. Dolby engineering is sort of "straightforward".
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