Quote:
Originally Posted by d3rd3vil
Thank you very much benwaggoner for the detailed information. Its interesting and YET disappointing its thats difficult meaning no Dolby Vision for us noses soon Cant be helped aparently.
At least Dolby itself could release a DV software that would be nice
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Dolby Vision is a quite complex set of technologies. In essence,
- Starts with 12-bit Y'CtCp PQ 2020 HDR content, typically 4000 nits peak and using the P3 subset of color volume.
- Plus creative intent metadata where a colorist indicates what parts of what frames are important to preserve on displays that are less than 4000 nit P3 (like blue sky or bright sky)
- Encodes it into one or two lower precision layers with metadata so it can be decoded with existing HW decoders
- On a device, decodes and then reverses the 1/2 layer coding to the native 12-bit Y'CtCp color space
- Then uses information about the particulars of the display it is being played back, combined with the creative intent metadata, to determine the optional way to map the 4000 nit P3 into whatever the display is capable of, so the sky comes out in the right mix of bright and blue
- And some even more complex pixel mapping and metadata stuff to make it work over HDMI
This isn't a simple incremental technology, but a complex set of interlocking technologies that need to get implemented together to be useful.
If one already has DoVi elementary streams and wants to play them back on a device that's enabled with DoVi playback, that seems potentially feasible as a pure muxing project. But even then there is a whole lot of metadata that needs to be handled correctly. I don't know of any open-source muxers are capable of this. Not that I've tried personally.