I'm looking for an error recovery measure comparing FLAC1.2 and WMA9 Lossless.

Indeed, the purpose of archiving is to be able to retrieve the information some later time, compression is one thing, but being able to recover as much as possible a corrupted file is another.

Some random file modification in FLAC or WMA I tried, showed that file are scratteched but which format is more resistant ??

Same questions applies for MP3pro and Ogg.

Thanks.

Sorry I do not know the answer to your question, however, might it not be more reliable to keep par2 files for your music collection on a seperate medium?

WinRAR can create a 10% error recovery section in your archives.

For DVD medium I use DVDisaster, and burn the correction files to CDs and DVDs.

I didn't know par2 files, interesting, but it generates large files.

Issue with compression like rar(7-zip, etc.), additionnal work - quite some if you have a large library - and can't readily play your library.

Any contact of someone knowing the internal formats to answer such a tricky question.

Ideas otherwise to design a test case scenario.

Thanks,

P.S. Luckily with all these formats, if one changes some bytes, one does not loose the all file, contrary to .xls(2000)

Error recovery isn't free. The smaller the error recovery file the smaller the number of defects that can be tolerated.

Most people aren't willing to take a significant overhead in their music files to recover from a problem that may never occur on their system, so the file formats themselves typically don't provide significant error recovery, only the ability to play the parts that weren't affected.

MP3 (and MP3Pro) allows for corrupted frames not affecting the rest of the file. There is a provision for including a checksum in each frame, but most decoders ignore it, and it would only detect corruption, not correct it.

Not true. FooBar2000 will play files that are withing ZIP/RAR archives and will show them in your library. While it would take time, it would not have to be manual using a BAT script.

I would be more worried about this before using wmal:
http://www.hydrogenaudio.org/forums/index....c=59764&st=

error recovery typically means how much is lost and how well the codec can continue decoding in the presence of errors. par2/dvdisaster etc are error correction schemes, adding redundancy in order to correct errors.

I don't know how wmal recovers from errors but with flac you lose only the damaged frames, usually ~9msec per frame for CD audio.

FWIW, that particular sample (before it was removed) could be encoded to WMAL and then decoded without any loss to the audio data.

Other reported instances of WMAL being lossy posted to this forum that I've investigated revealed a problem with the CEP/Audition filter and not the format itself. This doesn't mean that there isn't a problem and I have no reason to doubt the claims that Spoon has made about WMAL.