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Old 21st August 2019, 19:22   #1661  |  Link
Zenitram
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Quote:
Originally Posted by mariner View Post
ARIB STD-B67 [...] PQ [...] But mediainfo only show vp92 for the downloaded clips
vp92 is not on the same line as ARIB STD-B67 or PQ, so misleading report.
I guess that you mean that "vp92" files (actually "VP9" content, I guess, and vp92 is just not recognized by MediaInfo so displayed as is) don't have transfer_characteristics related info.

Please provide a file (not a link to a youtube channel page).
If I read well the VP9 spec, HDR10+ info is in the container (WebM) and it would be relevant for me to support that (WebM still used by Google), currently it is not supported (looks like they don't use the same method than Matroska), but if it is in the VP9 bitstream I would be less motivated (VP9 is abandoned in favor of AV1...)
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Old 21st August 2019, 19:27   #1662  |  Link
SeeMoreDigital
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Originally Posted by Zenitram View Post
"MLP FBA" is the technical name preferred by Dolby Inc for naming this technology, and we list "TrueHD" as the commercial name now.
I wonder why Dolby went for that?!

I recently found this Dolby TrueHD high-level bitstream description - Dolby Developer [.pdf file] documentation but I can't seem to find out what FBA stands for...
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Old 22nd August 2019, 10:07   #1663  |  Link
Zenitram
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Originally Posted by SeeMoreDigital View Post
I can't seem to find out what FBA stands for...
You see in that doc "referred to in this document as the FBA syntax." ;-)

FBA and FBB are the last 12 bits of the magic sync value (0xF8726FBA / 0xF8726FBB).
IIUC FBB syntax is the first one (before Dolby buys Meridian Audio related technology) then Dolby updated the bistream syntax and has set FBA instead of FBB in the magic value for their version.

I don't have access to Meridian FBB spec, so difficult to know the exact purpose of the modified bit (was it planned or not? ...), but I was said that technical people working on MLP use the "FBA" term for speaking about the Dolby version.
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Old 16th September 2019, 21:27   #1664  |  Link
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Quote:
Originally Posted by Selur View Post
Small question about 'MasteringDisplay_ColorPrimaries', what to use for R, G, B, WP, when it only reports 'Display P3'?
The only solution i know for100% correct values is to index the file with DGIndexNV and look at the MASTERING Line. Problem, you need a Nvidea GTX 1050 or higher.
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