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Re: Dolby Vision now possible through MP4 Mux.
Posted: Fri Nov 01, 2024 11:25 am
by LV8HD
RESET_9999 wrote: Tue Oct 29, 2024 5:10 pm
LV8HD wrote: Tue Oct 29, 2024 4:48 pm
@RESET_9999 in the most recent update you introduced the possibility to measure brightness of an HDR10 video on a frame-by-frame basis, which, to me, seems the most correct approach. Does this mean the MadVR method is less accurate even with excluded letterboxes? does it work on a scene-by-scene basis?
good catch haha. I didn't mention it in the release note because it's soooooo slow that it's unusable. I practically wasted my time on this code but it is indeed a frame by frame analysis / plotting. It uses the same script that generates the maxcll/fall stats in (7-2) (7-1).
Madvr analysis is also frame by frame but because I use Dovi_tool to plot the data, the graph is shot by shot. It's still 100% accurate but the values are rounded shot by shot. MadVR overall should be more accurate too since it measure pixels perceptually while the other script just measures the pixels as they are without any restriction.
I see. Correct me if I'm wrong. MadVR measures pixels using perceptual quantization while the other script the raw data?
Re: Dolby Vision now possible through MP4 Mux.
Posted: Fri Nov 01, 2024 12:04 pm
by RESET_9999
right
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Nov 02, 2024 5:03 pm
by LV8HD
@RESET_9999 pushed by curiosity I decided to check what the fastest method of measuring HDR with excluded letterboxes was on my PC (MKV measurement vs. Cropped ProRes measurement). The winner ended up being MKV although I have a good CPU (AMD Ryzen 7 7700x), but that's not the point.
As soon as both measurements were done (same movie) I took a look at them expecting to see the same results, however, they differed of a couple of nits. Why is that?
MKV measurement
ProRes measurement
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Nov 02, 2024 6:45 pm
by RESET_9999
prores encode probably change the grain structure a little bit so small variation like that is normal
The winner ended up being MKV although I have a good CPU (AMD Ryzen 7 7700x), but that's not the point.
Thats surprising. On my i9 13900ks it's almost two times faster with prores.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Tue Nov 05, 2024 10:57 am
by daffie
kazuma wrote: Thu Oct 31, 2024 5:17 pm
reset_9999, how did you find the PQ of the tenant with cm4.0?
Hi, how do you watch ''with cm4.0'' ?
By using the CPM build with the AM6B+ ?
Re: Dolby Vision now possible through MP4 Mux.
Posted: Tue Nov 05, 2024 10:50 pm
by TheEqualizer
RESET_9999 wrote: Wed Oct 16, 2024 7:28 pm
maybe, I dont know. You can also demux with tsmuxer
I've done all sorts of tests with this German edition of the movie "Late Night with the Devil". I used mkvtoolnix, dovi_script, DGDemux, MakeMKV, the first three have a similar output, the last one does not output correctly, but if you compare the scene-cuts of all the options, but they do not match the scene-cuts of the EL layer extracted using tsMuxeR, does this mean that technically remux mkv 7Profile is not allowed?
EL_scene-cuts
MKVToolNix_DoVi-Script_DGDemux_scene-cuts
https://i.ibb.co/KrX9cbG/EL-PLOT.png
https://i.ibb.co/VBs1t5h/ST-DL-PLOT.png
Re: Dolby Vision now possible through MP4 Mux.
Posted: Wed Nov 06, 2024 12:52 am
by RESET_9999
I dont know. I watched this one in Profile 8 without EL and everything was fine.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Wed Nov 06, 2024 5:40 am
by TheEqualizer
RESET_9999 wrote: Wed Nov 06, 2024 12:52 am
I dont know. I watched this one in Profile 8 without EL and everything was fine.
I'll tell you more, those who have already watched the remux in mkv 7p also did not see anything suspicious, so in the question I pointed out that technically it is still not correct and it is not allowed to make such remuxs. Perhaps if a
British UHD appears, things will be better on it.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Wed Nov 06, 2024 11:30 am
by RESET_9999
i dont know but my p8 remux is perfectly in sync with the BL scene cuts
Re: Dolby Vision now possible through MP4 Mux.
Posted: Fri Nov 08, 2024 10:25 pm
by RESET_9999
TheEqualizer wrote: Wed Nov 06, 2024 5:40 am
so in the question I pointed out that technically it is still not correct and it is not allowed to make such remuxs. Perhaps
I had another look at this movie and indeed a P7 mux with dovi_tool or mkvtoolnix is still wrong.
The RPU extracted from tsmuxer demuxed hevc is fine though so a P8 rip works.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Nov 09, 2024 10:18 am
by valington
RESET_9999 wrote: Fri Nov 08, 2024 10:25 pm
TheEqualizer wrote: Wed Nov 06, 2024 5:40 am
so in the question I pointed out that technically it is still not correct and it is not allowed to make such remuxs. Perhaps
I had another look at this movie and indeed a P7 mux with dovi_tool or mkvtoolnix is still wrong.
The RPU extracted from tsmuxer demuxed hevc is fine though so a P8 rip works.
maybe try to do this film in TS container and it will be proper in ts muxer
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Nov 09, 2024 1:50 pm
by RESET_9999
valington wrote: Sat Nov 09, 2024 10:18 am
maybe try to do this film in TS container and it will be proper in ts muxer
tsmuxer doesn't support ST-DL authoring.
anyway the problem is the EL and german discs
Re: Dolby Vision now possible through MP4 Mux.
Posted: Tue Nov 12, 2024 1:42 pm
by daffie
RESET_9999 wrote: Fri Nov 08, 2024 10:25 pm
TheEqualizer wrote: Wed Nov 06, 2024 5:40 am
so in the question I pointed out that technically it is still not correct and it is not allowed to make such remuxs. Perhaps
I had another look at this movie and indeed a P7 mux with dovi_tool or mkvtoolnix is still wrong.
The RPU extracted from tsmuxer demuxed hevc is fine though so a P8 rip works.
I have a profile 7 mkv of this movie - is there a way to make a P8 rip from it while keep all the EL data ?
Not with this German disc I guess?
Re: Dolby Vision now possible through MP4 Mux.
Posted: Tue Nov 12, 2024 7:04 pm
by RESET_9999
daffie wrote: Tue Nov 12, 2024 1:42 pm
I have a profile 7 mkv of this movie - is there a way to make a P8 rip from it while keep all the EL data ?
Not with this German disc I guess?
Remove the EL and inject this RPU:
https://drive.google.com/file/d/1urqjRi ... drive_link
Re: Dolby Vision now possible through MP4 Mux.
Posted: Thu Nov 14, 2024 8:45 am
by daffie
Thanks for your help!
Do I need to use workflow 4-1 for this?
