08.08.2022, 01:56
I don't know much about this matter, so I've started to find out about it.
I wanted to convert a movie with HDR to SDR using Hybrid. And I've found that the Vaporsynth's conversion filters don't work as expected. Or am I doing something wrong. The image is either more whitish or gray, or even worse than what it looks like without HDR processing. None of the filters or options seem to give an acceptable result.
However, I have seen that by using "No XSynth", and enabling Tonemap in the FFMPEG tab. The result seems to be what is expected with any of your options.
I have also tried to use a conversion from HDR to SDR through the Nvenc codec, and that has worked perfectly.
The Avisynth filter doesn't seem to have any options.
Apart from this, I don't understand much about it, but I have also noticed that, when in VUI, I believe that in any of the codecs, the options "transfer characteristics" and "color primaries" are activated, to input, without adding any other option to proccess, the result doesn't look whitish, and it appears to have been converted to SDR somehow.
The test video that I am using, a piece of the film, has these characteristics.
Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@High
HDR format : SMPTE ST 2086, HDR10 compatible
Codec ID : V_MPEGH/ISO/HEVC
Duration : 31 s 407 ms
Bit rate : 9 606 kb/s
Width : 3 840 píxeles
Height : 2 160 píxeles
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23,976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.048
Stream size : 36,0 MiB (93%)
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0050 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 1000 cd/m2
Maximum Frame-Average Light Level : 180 cd/m2
I wanted to convert a movie with HDR to SDR using Hybrid. And I've found that the Vaporsynth's conversion filters don't work as expected. Or am I doing something wrong. The image is either more whitish or gray, or even worse than what it looks like without HDR processing. None of the filters or options seem to give an acceptable result.
However, I have seen that by using "No XSynth", and enabling Tonemap in the FFMPEG tab. The result seems to be what is expected with any of your options.
I have also tried to use a conversion from HDR to SDR through the Nvenc codec, and that has worked perfectly.
The Avisynth filter doesn't seem to have any options.
Apart from this, I don't understand much about it, but I have also noticed that, when in VUI, I believe that in any of the codecs, the options "transfer characteristics" and "color primaries" are activated, to input, without adding any other option to proccess, the result doesn't look whitish, and it appears to have been converted to SDR somehow.
The test video that I am using, a piece of the film, has these characteristics.
Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@High
HDR format : SMPTE ST 2086, HDR10 compatible
Codec ID : V_MPEGH/ISO/HEVC
Duration : 31 s 407 ms
Bit rate : 9 606 kb/s
Width : 3 840 píxeles
Height : 2 160 píxeles
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23,976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.048
Stream size : 36,0 MiB (93%)
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0050 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 1000 cd/m2
Maximum Frame-Average Light Level : 180 cd/m2