如果你習慣從在線商城下載 FLAC（自由無損音頻壓縮編碼）格式的音頻文件，請不要使用 Windows 10 系統的資源管理器來編輯元數據。在 Windows 10 Version 2004 及更高版本中存在一個錯誤，如果使用資源管理器修改元數據，就有可能會損壞 FLAC 音頻文件。
這個 BUG 影響 Windows 10 專業版、家庭版、企業版、工作站和其他 SKU 版本。根據本月早些時候發布的支持文件，Windows 10的文件資源管理器的錯誤將破壞某些FLAC文件，這些文件在FLAC頭之前包含一個ID3框架。ID3是一個框架，它負責存儲信息，如音樂標題、藝術家、專輯、曲目編號等。
在 Windows 10 系統，FLAC處理程序忽略了ID3框架，因為它認為FLAC文件在開頭使用4字節的fLaC。當音樂文件被用戶編輯時，ID3 框架被覆蓋了，沒有開始代碼。因此，音樂播放器無法識別修改後的文件。如果音樂文件的標題、藝術家或其他元數據在文件資源管理器中被改變，音樂文件就不會播放或加載。
幸運的是，微軟已經確定了根本原因，現在可以通過Windows Update進行修復。在 KB5003214 更新的更新日誌中，微軟確認該錯誤已被修復，如果你改變了他們的標題、藝術家或其他元數據，自由無損音頻編解碼器（FLAC）音樂文件將不再變得無法播放。
對於那些有損壞的音樂文件，微軟已經發布了一個新的PowerShell腳本，你可以運行它來使文件再次播放。然而，它不能恢復存儲在ID3框架中的丟失的元數據。為了避免FLAC音樂文件在未來出現問題，微軟建議應用本月的可選累積更新。
解決方案
1. 打開記事本
2. 將以下腳本代碼複製到記事本中
# Copyright 2021 Microsoft
# This script will repair a FLAC file that has been corrupted by Media Foundation in reference to KB5003430.
# Refer to KB5003430 for further information
param(
[parameter(Mandatory =$ true,
HelpMessage = “The path to the FLAC file that has been corrupted by Media Foundation”,
ValueFromRemainingArguments =$ true)]
[ValidateScript({ -not [String]::IsNullOrEmpty( $_) -and (Test-Path $_) })]
[String] $ File
)
# We need to back up the current file incase we have any errors
$ FileDirectory = Split-Path -Resolve $ File
$ Filename = Split-Path -Leaf -Resolve $ File
$ FullPath = Join-Path -Resolve $ FileDirectory $ Filename
$ Filename = [String]::Format(“Backup_{0:yyyyMMdd_hhmmss}_{1}”, [DateTime]::Now, $ Filename)
$ BackupLocation = Join-Path $ FileDirectory $ Filename
Write-Output “Microsoft FLAC Repair Tool. This tool will repair a FLAC audio file that was corrupted when editing its details.”
Write-Output “Affected File: $ FullPath”
Write-Output “A backup of the file will be made: $ BackupLocation”
Write-Output “Do you wish to continue?”
$ choice =$ host.ui.PromptForChoice(“Fixing FLAC Script”, “Do you wish to continue”, (‘&Yes’, ‘&No’), 1)
function ParseStreamInfoMetADATABlock([System.IO.FileStream] $ stream)
{
$ blockType = $ stream.ReadByte()
$ lastBlock = ($ blockType -shr 7) -ne 0
$ blockType = $ blockType -band 0x7F
if ($ blockType -ne 0)
{
return $ false
}
$ blockSize = (($ stream.ReadByte() -shl 16) -bor ($ stream.ReadByte() -shl 8) -bor $ stream.ReadByte())
if ($ blockSize -lt 34)
{
return $ false
}
$ minAudioBlockSize = ($ stream.ReadByte() -shl 8) -bor $ stream.ReadByte()
$ maxAudioBlockSize = ($ stream.ReadByte() -shl 8) -bor $ stream.ReadByte()
if ($ minAudioBlockSize -lt 16 -or $ maxAudioBlockSize -lt 16)
{
return $ false
}
$ minFrameSize = (($ stream.ReadByte() -shl 16) -bor ($ stream.ReadByte() -shl 8) -bor $ stream.ReadByte())
$ maxFrameSize = (($ stream.ReadByte() -shl 16) -bor ($ stream.ReadByte() -shl 8) -bor $ stream.ReadByte())
$ sampleInfo = (($ stream.ReadByte() -shl 24) -bor ($ stream.ReadByte() -shl 16) -bor ($ stream.ReadByte() -shl 8) -bor $ stream.ReadByte())
$ sampleRate = $ sampleInfo -shr 12
$ channelCount = (($ sampleInfo -shr 9) -band 0x7) + 1
$ bitsPerSample = (($ sampleInfo -shr 4) -band 0x1F) + 1
[UInt64] $ sampleCount = (($ stream.ReadByte() -shl 24) -bor ($ stream.ReadByte() -shl 16) -bor ($ stream.ReadByte() -shl 8) -bor $ stream.ReadByte())
$ sampleCount = (([UInt64] $ sampleInfo -band 0xF) -shl 32) -bor $ sampleCount
$ MD5HashBytes = New-Object byte[] 16
$ stream.Read( $ MD5HashBytes, 0, $ MD5HashBytes.Length)
$ MD5Hash = [Guid]( $ MD5HashBytes)
if ($ sampleRate -eq 0)
{
return $ false
}
# Passing these checks means that we likely have a stream info header and can rebuild the file
Write-Output “File Stream Information”
Write-Output “Sample Rate: $ sampleRate”
Write-Output “Audio Channels: $ channelCount”
Write-Output “Sample Depth: $ bitsPerSample”
Write-Output “MD5 Audio Sample Hash: $ MD5Hash”
return $ true
}
if ($ choice -eq 0)
{
Copy-Item $ FullPath -Destination $ BackupLocation -Force
$ stream = [System.IO.File]::Open( $ FullPath, [System.IO.FileMode]::Open)
$ stream.Seek(4, [System.IO.SeekOrigin]::Begin)
while ($ stream.ReadByte() -eq 0) {}
# We now need to figure out where a valid FLAC metadata frame begins
# We are likely pointing to the last byte of the size member so we’ll seek back 4 bytes and retry
$ flacDataStartPosition = $ stream.Position – 4
$ stream.Seek( $ flacDataStartPosition, [System.IO.SeekOrigin]::Begin)
while (-not(ParseStreamInfoMetadataBlock( $ stream)))
{
$ flacDataStartPosition = $ flacDataStartPosition + 1
$ stream.Seek( $ flacDataStartPosition, [System.IO.SeekOrigin]::Begin)
}
# Insert the start code
$ stream.Seek( $ flacDataStartPosition, [System.IO.SeekOrigin]::Begin)
if (Test-Path “$ FullPath.tmp”)
{
Remove-Item “$ FullPath.tmp”
}
$ fixedStream = [System.IO.File]::Open(” $ FullPath.tmp”, [System.IO.FileMode]::CreateNew)
[byte[]] $ startCode = [char[]](‘f’, ‘L’, ‘a’, ‘C’);
$ fixedStream.Write( $ startCode, 0, $ startCode.Length)
$ stream.CopyTo( $ fixedStream)
$ stream.Close()
$ fixedStream.Close()
Move-Item -Force “$ FullPath.tmp” $ FullPath
}
3. 文件菜單上，點擊保存。
4. 在 “另存為 “對話框中，找到你要保存PowerShell腳本的文件夾。
5. 在文件名框中，輸入FixFlacFiles.ps1，將保存類型框改為文本文檔（*.txt），然後點擊保存。
6. 在Windows Explorer中，找到你保存的PowerShell腳本。
7. 右鍵單擊該腳本，然後單擊用PowerShell運行。
8. 當有提示時，輸入無法播放的FLAC文件的文件名，然後按回車鍵。