[Flac] Rather serious flac problem

[Josh Coalson]

can you file a bug on sourceforge:

  http://sourceforge.net/tracker/?group_id=13478&atid=113478

and attach the first 100k of each file?  it will help to debug
since I don't have any wave files that cause this behavior.

Josh

--- Free Lunch <freelunch at gmail.com> wrote:
> Okay.. I love flac but just had a rather serious failure that really
> shakes my confidence.  It resulted in the near loss of a master audio
> recording.  Fortunately, I have a backup.  Though there may have been
> other cases where I have lost original material because I have been
> compressing a lot of originals and deleting them after doing a 'flac
> -t' on them.
> 
> Basically, flac failed with a 'warning' but still created flac
> archives which tested ok.
> 
> Here's the scoop:
> 
> % flac *wav
> 
> flac 1.1.1, Copyright (C) 2000,2001,2002,2003,2004 Josh Coalson
> flac comes with ABSOLUTELY NO WARRANTY.  This is free software, and
> you are
> welcome to redistribute it under certain conditions.  Type `flac' for
> details.
> 
> options: -P 4096 -b 4608 -m -l 8 -q 0 -r 3,3
> umb.1.wav: WARNING: skipping unknown sub-chunk 'p9'
> umb.2.wav: WARNING: skipping unknown sub-chunk 'c=¶'
> % flac -t *flac
> 
> flac 1.1.1, Copyright (C) 2000,2001,2002,2003,2004 Josh Coalson
> flac comes with ABSOLUTELY NO WARRANTY.  This is free software, and
> you are
> welcome to redistribute it under certain conditions.  Type `flac' for
> details.
> 
> umb.1.flac: ok                    
> umb.2.flac: ok                    
> % ls -lt
> total 3105736
> -r--r--r--  1 root root       4186 Jun  5 00:43 umb.2.flac
> -r--r--r--  1 b    b    1933467692 Jun  5 00:43 umb.2.wav
> -r--r--r--  1 root root       4186 Jun  4 22:37 umb.1.flac
> -r--r--r--  1 b    b    1243668524 Jun  4 22:37 umb.1.wav
> 
> % file *
> umb.1.flac: FLAC audio bitstream data, 24 bit, stereo, 44.1 kHz,
> length unknown
> umb.1.wav:  RIFF (little-endian) data, WAVE audio, Microsoft PCM, 24
> bit, stereo 44100 Hz
> umb.2.flac: FLAC audio bitstream data, 24 bit, stereo, 44.1 kHz,
> length unknown
> umb.2.wav:  RIFF (little-endian) data, WAVE audio, Microsoft PCM, 24
> bit, stereo 44100 Hz
> 
> 
> % flac -v
> flac 1.1.1
> % uname -a
> Linux foobar 2.6.7-gentoo-r11 #12 Fri Aug 12 19:40:17 EDT 2005 x86_64
> AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux
> 
> 
> My guess is that in this case, the wav file header may not correctly
> reflect the length of the wav file.  I would think that flac could be
> coded to handle these cases correctly.



		
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