It is a good signPapitaHD wrote: Sat Sep 26, 2020 12:55 pm I checked all of them and only Saving Private Ryan flickers.
Thanks for the files!
I see. Profile 5 only? No profile 8?RESET_9999 wrote: Sat Sep 26, 2020 3:46 pm Because I have a another DV TV with an appleTV in another room.
I think so too. Also because all the examples you mentioned occur during the decoding phase, using the previously encoded information.RESET_9999 wrote: Sat Sep 26, 2020 3:46 pm But i do get that in order to obtain a new/proper profile 5 file, encoding is required.
The concept of "-mode 2" should remain associated with those profiles (5/8) in which the EL is completely absent (and the RPUs have a different structure). In this case I'm trying to mimic the behavior of a MEL file.shawnc22 wrote: Sat Sep 26, 2020 4:46 pm this is a more sophisticated version of your previous -mode 2 conversion?
During decoding, the image generated by the data present in EL represents a residue (difference) of the original video content compared to the image obtained by processing the data present in BL.shawnc22 wrote: Sat Sep 26, 2020 4:46 pm When converting to MEL, am I correct to understand that your tool is not actually converting the base layer to 4000 nits with information from the EL, but instead modifying the RPU so that it can tell the decoder later during playback that no extra picture information exists on the EL, thus treating the entire file as MEL?
EL is a 10-bit video bitstream that carries the residual between the mezzanine source and the base layer and the dynamic metadata for Dolby Vision.
By modifying the RPU the idea is to tell the decoder that the residual signal is equal to zero and that it should not bother to "read" the content.
The rest of the information, both static (eg, MaxFALL and MaxCLL) and dynamic (eg, min, max and avg luminance of each shot) remain unchanged.
By giving up the process of decoding the data in EL, I think it is normal that it is no longer possible to generate the 12bit signal as it was mastered by the creators (using monitors up to 10000 nits).
Keep also in mind that current consumer displays rarely exceed 2000 nits (LCD). OLEDs peak at 600-700 nits, and few home projectors are lucky enough to hit 150 nits. When the signal exceeds the capability of the TV, tone mapping is activated by reducing the luminance as the signal approaches the clipping point of the display (following a Perceptual Quantizer (PQ) curve, remaps luminance from the source values to the lower values the display can support)
