Win10 又带着Bug来了！部分 FLAC 格式音乐文件损坏，已发布紧急更新修复

他来了，他来了，他又带着bug走来了！

5月底，微软发布的一份最新文档，称修复了一个令众多用户苦恼的问题。Win10 文件管理器中存在一个 Bug，可使部分 FLAC 格式音频文件损坏。（好家伙，无损变全损，这我可受不住）

微软称，在 Win10 2004 及以上版本中，如果使用文件管理器修改 FLAC 音频文件的元数据，比如标题、艺术家或者其他音频元数据，将使 FLAC 文件损坏，无法播放。

部分 FLAC 文件开头会包含 ID3 帧头，其中包含歌手、标题、专辑名称、年代、风格等信息。

而在 Win10 2004 及以上版本中，文件资源管理器会忽略 ID3 帧头，因为它默认判定 FLAC 文件使用 4 字节 fLaC 开头。因此当用户使用文件资源管理器修改 FLAC 文件的元数据时，就会把 ID3 帧头覆盖掉，从而破坏原有的 FLAC 文件结构，使音乐播放器无法正常识别。

该bug影响多个Windows 10版本（Home、Pro、Enterprise、Education、Pro Education和Pro for工作站）和版本2004和版本20H2。

微软已针对该 Bug 发布了紧急修复更新，在 KB5003214 更新中，微软确认已修复该问题，大家安装即可。

1. 打开notepad，并输入下方内容

# 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

}

2. 点击保存，将文件保存为 FixFlacFiles.ps1，保存类型设置为（*.txt）

3. 在Windows资源管理器中找到保存的PowerShell脚本，然后单击「使用PowerShell运行」

4. 在弹出的对话框中，输入不可播放的fLAC文件的文件名，然后点击「enter」

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