On Tue, Nov 7, 2023 at 11:21 AM <markfilipak.i...@gmail.com> wrote:
> On 11/7/23 04:08, Phil Rhodes via ffmpeg-user wrote: > > I have no idea how colour handling in x265 works so I can't really > advise on specifically how to set it up. Possibly it's documented > somewhere. One of the problems with this (which comes up in some high end > post production software quite often) is that it's sometimes not very clear > whether we're specifying what we expect the input data to be, or what we > expect it to be converted to. > > I thought only I had that problem. :-) > > > For instance, I'm not sure what's meant by "transfer" in this context. > > Perfect example. > > >> It's 1920x1080. I 'heard' of "studio swing". What is it relative to > what x265 expects (above)? Do you know? > > I'm possibly guilty of indulging in jargon here; by "studio swing" I'm > referring to a reduced data range often from 16-235 for the luminance > channel. > > The preferred term appears to be 'limited range'. > > >> I feel a headache coming on. Let's assume ffprobe is correct and > colormatrix is undefined on the discs > > What's on the disc will be in Rec. 709. > > I don't think so. If that were true, then what's on disc and what's in the > MP4 would both play > accurately and without saturation. I'm pretty sure they're not BT709. > > > I honestly don't know what data ranges blu-rays use. > > Limited. It's silly -- more legacy analog TV hangover -- but it's limited. > The MPEG folks just can't > seem to wean themselves away from TV-on-disc. > > > It's often fairly clear if you can look at it and it looks all lifted, > that'll be why. > > "lifted"? > > > Unfortunately there are a lot of moving parts here. > > I may be naive but I don't think so. X265 has presets that appear to cover > all commercial media. How > it covers is apparently a matter of some conjecture. But really, all that > color adaptation stuff, > like to accommodate phosphors in CRTs, needs to be done BY THE TV, not by > the media. There should be > one set of colors and they should be RGB full range with unlimited gamut. > The TV makers know what > the TVs are capable of and can do dot-by-dot fix up. > > You're off the hook, Phil. Thanks for your thoughts. I appreciate them. -- > Mark. > Use setparams filter to properly tag inputs colorspace related metadata. > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
