color issues with x265

[OrionZodiac]

I'm trying to learn how to do encode x265 through MeGUI and for some reason the color on my encodes are faded. I tried reading about it on doom9...something to do with BT.2020 and using dither to correct, but still having same issues. I uploaded a sample. The top is my encode and the bottom my source.

Here is media info from source:
Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Commercial name : HDR10
Format profile : Main 10@L5.1@High
Codec ID : hvc1
Codec ID/Info : High Efficiency Video Coding
Duration : 1 min 26 s
Bit rate : 71.4 Mb/s
Maximum bit rate : 114 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 59.940 (60000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.144
Stream size : 733 MiB (100%)
Encoded date : UTC 2016-10-24 06:29:51
Tagged date : UTC 2016-10-24 05:33:22
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primar : R: x=1.000000 y=1.000000, G: x=1.000000 y=1.000000, B: x=1.000000 y=1.000000, White point: x=1.000000 y=1.000000
Mastering display luminance : min: 0.1000 cd/m2, max: 1 cd/m2

Anybody know how to correct this?

[Selur]

Not being a MeGui-user for years, here's my two cents:

What does MediaInfo say about the output?
What are your encoding settings?

My guess is atm. that you are converting HDR content:
a. to SDR without doing any HDR->SDR mapping
b. keeping it as HDR, but forgot to set the needed

Cu Selur

Ps.: no clue whether MeGui even supports HDR->SDR out of the box (or if one would have to manually edit the Avisynth script), but that can probably be cleared up by someone using MeGui

[KarMa]

Megui has no HDR-->SDR tools that I know of. Off the top of my head RipBot264 has HDR-->SDR support. I've never tried it so I can't speak more than that.

[sneaker]

Mastering display color primar : R: x=1.000000 y=1.000000, G: x=1.000000 y=1.000000, B: x=1.000000 y=1.000000, White point: x=1.000000 y=1.000000
Mastering display luminance : min: 0.1000 cd/m2, max: 1 cd/m2

Those values are bogus, btw. Work with a non-broken source if you want to learn. (The things Selur and KarMa said apply nonetheless.),

If you want to keep HDR encode to HEVC 10 bit and set the metadata like source. For x265:
https://x265.readthedocs.io/en/latest/cli.html#vui-video-usability-information-options

To convert HDR to SDR in AviSynth you can use for example:
DGTonemap (software) or DGHDRtoSDR (CUDA/Nvidia)

[pandy]

To convert HDR to SDR in AviSynth you can use for example:
DGTonemap (software) or DGHDRtoSDR (CUDA/Nvidia)

Or instead AviSynth a ffmpeg can be used:
https://stevens.li/guides/video/converting-hdr-to-sdr-with-ffmpeg/
https://forum.doom9.org/showthread.php?t=175125

[OrionZodiac]

man, you guys are awesome. I think this is what I was looking for. I will try it and see what happens. Seems like I will need to convert HDS -> SDR...thanks for all the links. I will read those and see what I can come up with