Build instructions outdated. Please revise to current usage requirements.

[Noemata]

Please update the build instructions and provided examples. Even after peering into the PowerShell build script and using the example given:

.\BuildFFmpeg.ps1 -Architectures x86,x64,arm64 -AppPlatform uwp -CRT dynamic -Settings "--enable-small"

I get this error:

At X:\samples\FFmpegInterop\BuildFFmpeg.ps1:114 char:58

• $hostArch = [System.Environment]::Is64BitOperatingSystem ? 'x64' : 'x ...

•                                                      ~
  

Unexpected token '?' in expression or statement.
At X:\samples\FFmpegInterop\BuildFFmpeg.ps1:139 char:43

• $spectreLibs = $AppPlatform -eq 'onecore' ? '' : 'spectre'

•                                       ~
  

Unexpected token '?' in expression or statement.
+ CategoryInfo : ParserError: (:) [], ParseException
+ FullyQualifiedErrorId : UnexpectedToken

[Mansoo]

I had the same problem.
In my case, the powershell I was using was an older 5.x version, and upgrading to version 7 (clean install) solved the problem.

After installation, I used “PowerShell 7 (x64)” in the startup program and compiled without errors.
(The ? syntax that causes the error is said to be supported only by PowerShell 7 or later)

1) Check the version of PowerShell :.
PS C:\blahblah> $PSVersionTable
.....
PSVersion 5.1.22621.3880 <--- your version
PSEdition Desktop
.....

2) Install the new version.

Check for new versions:

• winget search Microsoft.PowerShell.

Perform the installation:

• winget install Microsoft.PowerShell