Flac corruption in MM 2.5.5.996

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Expand view Topic review: Flac corruption in MM 2.5.5.996

Flac corruption in MM 2.5.5.996

by rusty » Wed Jun 13, 2007 11:32 am

MediaMonkey 2.5.5.996/997 had a bug which overwrote the first 4 bytes in a flac header during tagging operations. The impact of the bug is that SampleRate and bitrate Rate info is lost lost from the header, causing playback problems on other players and devices.

This issue was fixed in version 2.5.5.998. To prevent the problem from occuring, upgrade to the current version of MediaMonkey.

If this problem affects tracks in your library, a flacfix tool http://www.mediamonkey.com/beta/FlacFixTool.zip has been created that tries to recreate header data in the first audio frame. In cases where the buggy tagging occured only once, the 4-byte header can be recreated so that the flac file is exactly as it was when it was originally ripped. However, if the file was tagged several times by the faulty version of MediaMonkey, it is impossible to recover the tag. To use the tool:

1. extract the zip file to Program FilesMediaMonkeyScriptsAuto folder and restart MediaMonkey.
2. select all your flac tracks, and select Tools > Check and fix flac corruption.
MediaMonkey will check the integrity of your flac tracks, and attempt to repair those that have been compromised.

After the tool has been run, download audiotester at http://www.vuplayer.com/files/audiotester.zip and have it verify all your FLAC files. It will report any files that are still damaged.

For tracks reported as damaged, there are 2 options:

1. Convert the FLAC files to FLAC using the current version of MediaMonkey. This will re-encode the files without the first (corrupted) frame, but will consequently lose the first few ms of audio data (this is usually silence).
2. Rerip the CDs. This is often the preferred approach if you need your flac files to be lossless replicas of the original CD, however, it can be painful as it requires previously entered metadata to be re-entered.

The following may help in terms of retaining as much metadata as possible: http://www.mediamonkey.com/forum/viewto ... 3659#43659

Another possibly useful script for importing metadata is at:
http://www.mediamonkey.com/forum/viewtopic.php?t=8882

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