[Flac] Checking file integrity

[scott brown]

flac -t audio.flac

-d, --decodeDecode (flac encodes by default). flac will exit with an exit
code of 1 (and print a message, even in silent mode) if there were any
errors during decoding, including when the MD5 checksum does not match the
decoded output. Otherwise the exit code will be 0. -t, --test Test (same as
-d except no decoded file is written). The exit codes are the same as in
decode mode.
On Sun, Apr 24, 2011 at 5:43 AM, Anton Shepelev <anton.txt at gmail.com> wrote:

> J.B. Nicholson-Owens:
>
> > I'm not sure what you're asking for
>
> I  have  a huge archive of FLAC files and want auto-
> matically to check the integrity thereof, so  as  if
> some  file be reported as corrupted I can restore it
> from a mirror backup.
>
> > I should have mentioned before that apparently the
> > MD5  hash is computed on the uncompressed raw sam-
> > ple data and the easiest way  to  check  the  FLAC
> > file is with
> >
> >        flac --verify audio.flac
> >
>
> This  doesn't work, and the official FLAC focumenta-
> tion says this option  is  only  applicable  to  WAV
> files:
>
>    -V, --verify
>        Verify  the  encoding process. With this
>        option,  flac  will  create  a  parallel
>        decoder  that  decodes the output of the
>        encoder and compares the result  against
>        the  original. It will abort immediately
>        with an error if a mismatch  occurs.  -V
>        increases the total encoding time but is
>        guaranteed to catch any unforseen bug in
>        the encoding process.
>
> It seems to have nothing to do with the MD5 hash.
>
> The  procedure  you  have described in your previous
> reply is quite complicated for an  automatic  check-
> ing.  Why  does FLAC calculate MD5 on the RAW uncom-
> pressed data?  If  it  were  using  compressed  data
> instead  the checking wouldn't require decompression
> and would be quicker: just calculate the hash on the
> binary  file  and  compare  it  against  the  stored
> value...
>
> Anton
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