FLAC Stream Decoder Error, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_S Options

[Zennon]

I'm in the process of backing up 500 CD-DA discs in FLAC format (using EAC). I ran a shell script to test (flac.exe -t; flac version 1.1.1) the 4000 FLAC files on my hard drive so far and found that flac.exe reported errors for 36 files. All errors are the same:

<filename>: *** Got error code 0:FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC

The files decompress fine, but now I'm not sure if I got the exact WAVs back. What does this error message mean, and how severe is the error? Moreover, is there a way to avoid it when compressing WAVs to FLAC in EAC?

This post has been edited by Zennon: Jan 17 2005, 00:10

[jcoalson]

OK, found the problem. it is a decoder bug that is exposed when there is an id3 tag at the end of the file AND the last frame of the audio stream has a certain blocksize. integrity of the audio is not affected but the sync error is annoying. no need to re-encode either.

it's fixed in CVS and will be in the next release.

Josh

[80k]

OK, found the problem.  it is a decoder bug that is exposed when there is an id3 tag at the end of the file AND the last frame of the audio stream has a certain blocksize.  integrity of the audio is not affected but the sync error is annoying.  no need to re-encode either.

it's fixed in CVS and will be in the next release.

Josh

interesting. yea it has happened to me a bunch, and i just decoded and reencoded (which stripped the id3 tag, i guess). i did it because foobar always pops up a message and i wanted it to go away

so a fix would be to set EAC to not "add ID3 tag", huh? in fact, the ID3 tag really does nothing and has no place/purpose in a flac file, cuz it uses a different tagging system?

[Zennon]

Josh, many thanks for sorting this out. Glad to hear I don't have to re-rip/re-encode.

Cheers,
Zennon

[KingTubba]

I was wondering if you could help me out. I have a bunch of flacs (with no access to the original sources) that I encoded but give the LOST_SYNC error when verified. The strange thing is they will play fine in Media Monkey if a non LOST_SYNC file is played first (?). Anyway, is there anyway to fix the files? flac -d doesn't work. It gives the same error, and if you tell decode through errors is says something about the source file being to big for a single wav chunk. Note: Yes, these were originally encoded with an id3 tag, silly of me...

Any ideas on how to fix the files? I do have a 4MB sample (its an intro to a "song") that I could email over if anyone needs to see it. Feel free to reply here or email me at maps1@nesurf.com.

[jcoalson]

I was wondering if you could help me out. I have a bunch of flacs (with no access to the original sources) that I encoded but give the LOST_SYNC error when verified. The strange thing is they will play fine in Media Monkey if a non LOST_SYNC file is played first (?). Anyway, is there anyway to fix the files? flac -d doesn't work. It gives the same error, and if you tell decode through errors is says something about the source file being to big for a single wav chunk. Note: Yes, these were originally encoded with an id3 tag, silly of me...

Any ideas on how to fix the files? I do have a 4MB sample (its an intro to a "song") that I could email over if anyone needs to see it. Feel free to reply here or email me at maps1@nesurf.com.

got the file. it's corrupted. I can see in a hex editor that there are big blocks of zeroes where the middle of the id3v2 tag and beginning of the FLAC stream should be.

flac -dF is currently not able to decode through errors like this.

Josh

[KingTubba]

got the file.  it's corrupted.  I can see in a hex editor that there are big blocks of zeroes where the middle of the id3v2 tag and beginning of the FLAC stream should be.

flac -dF is currently not able to decode through errors like this.

Josh

So no way to fix it yet? No flac repair tools out there yet huh? Will using Case's Tag as stated above have any effect?

By the way, I repeat, the files play and sound great in Media Monkey (if I play a song that does not have this problem first), so I'm a little confused by your statement that the begining of the FLAC stream has a bunch of zeros in it...

P.S. I forgot to mention, that if there is a way to repari the file I do not mind loosing any of the tags as there are a plenty of programs that will be able to retag them from their filename/directory struction.

This post has been edited by KingTubba: Apr 21 2005, 17:55

[jcoalson]

So no way to fix it yet? No flac repair tools out there yet huh?

no, the damage is too severe. it is possible to recover frames on a frame-by-frame basis totally ignoring the metadata but I still have to add that functionality to -F.

another FLAC developer has written a frame decoder that includes recovery but I haven't tried it. it may work for your files:
http://phoenix.inf.upol.cz/~lichvarm/affd/affd-0.1.0.tar.gz

Will using Case's Tag as stated above have any effect?

not on this file I don't think. even the id3v2 tag is corrupted.

By the way, I repeat, the files play and sound great in Media Monkey (if I play a song that does not have this problem first), so I'm a little confused by your statement that the begining of the FLAC stream has a bunch of zeros in it...

can't explain that.

Josh