setup.iss

; Script generated by the Inno Setup Script Wizard.
; SEE THE DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!

#define MyAppName "FFmpeg"
#define MyAppVersion "$version"
#define MyAppPublisher "ffmpeg.org"
#define MyAppURL "https://ffmpeg.org/"

[Setup]
; NOTE: The value of AppId uniquely identifies this application. Do not use the same AppId value in installers for other applications.
; (To generate a new GUID, click Tools | Generate GUID inside the IDE.)
AppId=ffmpeg
AppName={#MyAppName}
AppVersion={#MyAppVersion}
AppVerName={#MyAppName} {#MyAppVersion}
AppPublisher={#MyAppPublisher}
AppPublisherURL={#MyAppURL}
AppSupportURL={#MyAppURL}
AppUpdatesURL={#MyAppURL}
DefaultDirName={autopf}\{#MyAppName}
DefaultGroupName={#MyAppName}
DisableProgramGroupPage=yes
; Remove the following line to run in administrative install mode (install for all users.)
PrivilegesRequired=lowest
WizardImageFile=ffmpeg.bmp
WizardSmallImageFile=ffmpeg-small.bmp
OutputDir=dist
OutputBaseFilename=ffmpeg-setup
Compression=lzma
SolidCompression=yes
WizardStyle=classic
ChangesEnvironment=True

[Registry]
Root: HKCU; Subkey: "Environment"; ValueType:string; ValueName: "Path"; ValueData: "{olddata};{app}\bin"; Flags: preservestringtype; Check: NeedsAddPath('{app}\bin')

[Files]
Source: "$path\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs

[Code]
function NeedsAddPath(Param: string): boolean;
var
  OrigPath: string;
begin
  if not RegQueryStringValue(HKEY_LOCAL_MACHINE,
    'SYSTEM\CurrentControlSet\Control\Session Manager\Environment',
    'Path', OrigPath)
  then begin
    Result := True;
    exit;
  end;
  { look for the path with leading and trailing semicolon }
  { Pos() returns 0 if not found }
  Result := Pos(';' + Param + ';', ';' + OrigPath + ';') = 0;
end;