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Thread: A riddle wrapped up in an enigma - conversion errors

  1. #1

    Join Date
    Dec 2012
    Posts
    3

    A riddle wrapped up in an enigma - conversion errors

    Hello, it's a straight forward issue, but the context is puzzling. I am now re-converting my FLAC ripped library (over 200 titles) to MP3 library.

    I'm regularly (every few titles, sometimes 1-3 tracks per title) running into various errors mostly: 'FLAC__STREAM_DECODER_READ_FRAME', 'FLAC__STREAM_DECODER_READ_METADATA', and 'FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC'.

    Here's where things are getting interesting:
    Using Illustrate tools this FLAC library was ripped a few years ago using CDRipper (v13?) and batch converted to mp3 on a Windows PC.
    This time around, I copied the FLAC library to my iMac's HD (from the same external HD) and I'm running the conversion to MP3 under VM (Parallels) on my iMac (latest OS/Parallels). I'm using the latest versions of all the tools.

    I proceeded to do the following:
    1) Re-applied tags to a couple of the FLAC titles/tracks using mp3Tag. Then reconverted. Same errors.
    2) Went back to the original MP3 conversion (on the same external HD) and checked to see if the files I converted then show any errors in the same tracks/location - no issues whatsoever. They converted perfectly and are playing back without a hitch.
    3) Went back to the original FLAC library (on the same external HD) and tried running the conversion directly from there - Same errors!
    4) One last detail: I'm running the conversion on 4 CPUs. When it runs into errors, it will not allow me to exit the conversion status window. I can still retrieve the error log though. Finally, I decided to configure the conversion to continue decoding after running into corrupted files. No doubt they are; it sounds like the music skips.

    Point 3 above is of course the most interesting aspect. If I follow some logic, the original FLAC files that are showing corruption, worked somehow back when. Now they don't. Any ideas?

    There are so many corrupt files, it'll be a pain to go back and re-ripp them all. Even if I do, it is important for me to know the reason. What improbable cause could corrupt FLAC files over time? (almost like Vinyl;-)

    Thanks in advance!

    S.Alter
    Last edited by salter; 12-24-2012 at 11:37 AM.

  2. #2
    Administrator
    Join Date
    Apr 2002
    Posts
    39,053

    Re: A riddle wrapped up in an enigma - conversion errors

    HDD failure will corrupt the FLAC files.

    When ripping discs, straight after ripping, copy the files to a backup.

  3. #3

    Join Date
    Dec 2012
    Posts
    3

    Re: A riddle wrapped up in an enigma - conversion errors

    Quote Originally Posted by Spoon View Post
    HDD failure will corrupt the FLAC files.

    When ripping discs, straight after ripping, copy the files to a backup.
    Thanks for the reply. I ran a disk check utility on it and it shows no signs of errors. No history of failures that I know of. It's not particularly defragmented either.

    S.Alter

  4. #4
    dBpoweramp Guru
    Join Date
    Jan 2011
    Posts
    937

    Re: A riddle wrapped up in an enigma - conversion errors

    You can download the official flac.exe command line tool to check the file independently for errors

  5. #5

    Join Date
    Dec 2012
    Posts
    3

    Re: A riddle wrapped up in an enigma - conversion errors

    Quote Originally Posted by ********* View Post
    You can download the official flac.exe command line tool to check the file independently for errors
    Thank you for the suggestion. I'll give it a try.

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