Quick Summary
The "AVC Validation Failed" error on macOS typically indicates a problem with the Advanced Video Coding (AVC), also known as H.264, codec used for video encoding or decoding. This usually means that the system or application is having trouble reading, processing, or validating a video file’s codec information.
Common Causes
- Corrupted Video File: The video file itself might be corrupted, leading to issues with the AVC/H.264 codec during playback or editing.
- Incompatible Codec Version: The video file might be encoded with a version of H.264 not fully supported by the application or system's codec library.
- Missing or Outdated Codecs: The required AVC/H.264 codecs are either missing from the system or are outdated, hindering proper decoding.
- Application Issues: The specific application you are using to play or edit the video might have a bug or compatibility problem with certain AVC/H.264 encoded files.
- System Conflicts: Conflicting software or system-level configurations can sometimes interfere with the proper functioning of video codecs.
Step-by-Step Fixes
Method 1: Try a Different Video Player
Step 1: Attempt to open the video file with a different video player application on your macOS system, such as VLC Media Player (a commonly recommended free and open-source cross-platform multimedia player & framework), IINA, or QuickTime Player.
Step 2: If the video plays successfully in another player, the issue is likely related to the original application you were using. Consider updating or reinstalling that application.
Method 2: Update Codecs and macOS
Step 1: Ensure your macOS is up to date. Go to System Preferences > Software Update to check for and install any available updates. These updates often include codec updates.
Step 2: While macOS handles most codecs, check if the application you are using has its own codec updates or recommended codecs package. Note: Be cautious about downloading codecs from untrusted sources.
Method 3: Convert the Video File
Step 1: Use a video conversion tool (such as HandBrake, a free and open-source transcoder) to convert the video file to a different format or a different H.264 profile.
Step 2: Select a common and widely supported format like MP4 with H.264 video and AAC audio.
Step 3: After conversion, try to play the new file. This can often bypass codec issues in the original file.
Method 4: Check for Damaged Files
Step 1: Try downloading another copy of the same video file from its original source. The original download may have been corrupted during transmission.
Step 2: If you have another device (e.g., another computer, a smartphone), try playing the video on that device to determine if the issue is specific to your macOS system.
Step 3: Consider using a file integrity checker tool (if available for your video format) to verify the file's checksum against a known good value.
Method 5: Reinstall the Application
Step 1: If the issue persists with a specific application, try completely uninstalling it. This may involve deleting application support files as well as the application itself (check the application's documentation or the developer's website for instructions).
Step 2: Reinstall the latest version of the application from the official source.