DylanValenti wrote: ↑Sat Jan 28, 2023 9:12 am
Forgive me if this is a dumb question but what does MDL mismatch mean? Is there a way of fixing it? I noticed a lot of the incompatible web-dls on your spreadsheet cite “MDL mismatch”, but a lot of the compatible ones do as well @RESET_9999
MDL = mastering display luminance, in other words, this is the monitor brightness they used to grade the movie.
Some are in the "green" section because of the L1 plot comparison that clearly show that they are the same brightness. Why is there MDL mismatch? I dont know but studios are probably stupid, i doubt they did exactly the same grade on two different monitors so one value must be an error. Same goes for Bt2020 vs P3 of the MD, sometimes the same movie have different value depending on the streaming services but they are exactly the same grade.
But the thing is that MDL is defined in L6 metadata which has no effect on the image in DV but its also defined in the "source max PQ" which has a direct impact on the brightness in DV, see:
https://www.youtube.com/watch?v=sl_wopsmdmc
https://www.youtube.com/watch?v=56y0svpsTMw
so three options:
1- be 100% safe and never mux web and bd that have a MDL mismatch
2- if L1 plot is close enough, edit "source max pq" to what makes more sense(by looking at the grade brightness) and hope it's accurate.
3- if L1 plot is close enough, leave "source max pq" untouched and hope it's accurate.
I use option 2 FYI.
There are also some MA web-dl that have the first two frames MDL 1000nits but all the other frames have MDL 4000nits (Puss in boots 2 / Tar)