iCloud内照片损坏，如何排查四万余张照片与视频的损坏范围？

Hey Anthony, sorry to hear about your corrupted scanned photos—dealing with a library of 40k+ photos and 2500 videos is no small task, so manual checks are totally out of the question. Here are actionable, scalable ways to spot damaged files across your entire collection:

1. Start with Photos App Built-In Tools (Quick & Easy) #

First, leverage macOS Photos' native features to catch obvious issues:

• Open Photos, then go to Photos > Show Corrupted Items (this option exists in most recent macOS versions). It’ll flag any files the app already recognizes as broken, though it might miss some subtle corruption.
• Create a Smart Album to filter unopenable files: Go to File > New Smart Album, set rules like File Type includes Image/Video, plus Status is Cannot Open. This pulls all system-identified damaged media into one view.

2. Command-Line Scans for Thorough Checks #

For deeper visibility, use macOS built-in tools or third-party CLI utilities to batch-test file integrity:

Use qlmanage to Verify Preview Capability #

qlmanage is the backend for macOS Quick Look—we can use it to test if files load properly:

# Navigate to your Photos library's master files (default path below)
cd ~/Pictures/Photos\ Library.photoslibrary/Masters

# Scan common media types, output paths of files that fail to preview
find . -type f \( -iname "*.jpg" -o -iname "*.png" -o -iname "*.mov" -o -iname "*.mp4" \) | while read file; do
  qlmanage -p "$file" >/dev/null 2>&1 || echo "Corrupted: $file"
done

This runs through each file and prints paths where Quick Look can’t render the media. It’s slower than metadata checks, but it’s a reliable test of whether the file is actually usable.

Use exiftool to Check Metadata Integrity #

If corruption is tied to broken metadata (common with scanned files), exiftool can flag these issues:

1. Install it via Homebrew first (if you don’t have Homebrew, run the official installation script in terminal):

   /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
   brew install exiftool
   

2. Run the scan to export damaged file paths to a text file:

   cd ~/Pictures/Photos\ Library.photoslibrary/Masters
   exiftool -q -if '$Error' -p '$Directory/$Filename' . > corrupted_media.txt
   

This will generate a corrupted_media.txt file with all files that have metadata errors, which you can review later.

3. Third-Party Tools for Non-Technical Users #

If command lines aren’t your thing, these apps offer user-friendly scanning:

• Photo Sweeper: While known for duplicate removal, its scan feature automatically detects unopenable photos/videos and lets you review them in a clean interface.
• Disk Drill: Its photo recovery module includes a file integrity check that can quickly flag damaged media across your library.

Pro Tips Before You Start #

• Backup First: Copy your entire Photos Library.photoslibrary folder to an external drive before running any scans—better safe than sorry if something goes wrong.
• Re-sync from iCloud: If you find widespread corruption, try toggling off iCloud Photos on your Mac (wait for local files to delete), then re-enable sync to pull fresh copies from iCloud’s servers. Sometimes this fixes sync-related corruption.

内容的提问来源于stack exchange，提问作者Anthony Kong