Script to set HDR10 properties in a transcoded video file.

hdr-copy-metadata.ps1

# hdr-copy-metadata.ps1
# 
# Version: 1.0
# Reads HDR metadata from source file and applies it to a transcoded output file.

 param(
  [Parameter(Mandatory)]
  [string]$fsource,
  [Parameter(Mandatory)]
  [string]$fdest
)

# Pre-defined RGB & WP values for BT.2020
$BT2020_xW = 0.3127
$BT2020_yW = 0.3290
$BT2020_xR = 0.708
$BT2020_yR = 0.292
$BT2020_xG = 0.17
$BT2020_yG = 0.797
$BT2020_xB = 0.131
$BT2020_yB = 0.046

# Pre-defined RGB & WP values for P3-D65
$P3D65_xW = 0.3127
$P3D65_yW = 0.3290
$P3D65_xR = 0.680
$P3D65_yR = 0.320
$P3D65_xG = 0.265
$P3D65_yG = 0.690
$P3D65_xB = 0.150
$P3D65_yB = 0.060

# Extract values from source video
$colourSpace = mediainfo --Inform="Video;%MasteringDisplay_ColorPrimaries%" "$fSource"
$luminance = mediainfo --Inform="Video;%MasteringDisplay_Luminance%" "$fSource"
$maxCLL =  mediainfo --Inform="Video;%MaxCLL%" "$fSource"
$maxFALL = mediainfo --Inform="Video;%MaxFALL%" "$fSource"
if ( $maxCLL -eq "" ) {
  $maxCLL = "0 cd/m2"
}
if ( $maxFALL -eq "" ) {
  $maxFALL = "0 cd/m2"
}  

# Print results from MediaInfo
write-host "Colour Space: $colourSpace"
write-host "Luminance: $luminance"
write-host "MaxCLL: $maxCLL"
write-host "MaxFALL: $maxFALL"

# Extract max and min lumanances
$minLuminance = $luminance.split( )[1]
$maxLuminance = $luminance.split( )[4]

# Extract MaxCLL
$maxCLL_noUnit = $maxCLL.split( )[0]

# Extract MaxFALL
$maxFALL_noUnit = $maxFALL.split( )[0]

# Print extracted values
write-host "Minimum luminance: $minLuminance"
write-host "Maximum luminance: $maxLuminance"
write-host "MaxCLL: $maxCLL_noUnit"
write-host "MaxFALL: $maxFALL_noUnit"

# Edit second input based on values extracted from MediaInfo
switch ($colourSpace) {
  "BT.2020" {
    mkvpropedit "$fDest" --edit track:v1 --set chromaticity-coordinates-red-x="$BT2020_xR" `
	--set chromaticity-coordinates-red-y=$BT2020_yR   `
	--set chromaticity-coordinates-green-x=$BT2020_xG `
	--set chromaticity-coordinates-green-y=$BT2020_yG `
	--set chromaticity-coordinates-blue-x=$BT2020_xB  `
	--set chromaticity-coordinates-blue-y=$BT2020_yB  `
	--set white-coordinates-x=$BT2020_xW              `
	--set white-coordinates-y=$BT2020_yW              `
	--set max-luminance=$maxLuminance                 `
	--set min-luminance=$minLuminance                 `
	--set max-content-light=$maxCLL_noUnit            `
	--set max-frame-light=$maxFALL_noUnit
  }
  "Display P3" {
    mkvpropedit "$fDest" --edit track:v1 --set chromaticity-coordinates-red-x="$P3D65_xR" `
    --set chromaticity-coordinates-red-y=$P3D65_yR     `
	--set chromaticity-coordinates-green-x=$P3D65_xG   `
	--set chromaticity-coordinates-green-y=$P3D65_yG   `
	--set chromaticity-coordinates-blue-x=$P3D65_xB    `
	--set chromaticity-coordinates-blue-y=$P3D65_yB    `
	--set white-coordinates-x=$P3D65_xW                `
	--set white-coordinates-y=$P3D65_yW                `
	--set max-luminance=$maxLuminance                  `
	--set min-luminance=$minLuminance                  `
	--set max-content-light=$maxCLL_noUnit             `
	--set max-frame-light=$maxFALL_noUnit
  }
  default { write-warning "Unknown Colourspace" }
}