[flac-dev] exhaustive-model-search issue results in multi-gigabyte FLAC file

[Leigh Dyer]

Hi,

On a particular input file, FLAC (testing with current git) greatly 
inflates its output if I encode at level 7, which enables 
--exhaustive-model-search. The source is a 24-bit WAV file of about 
60MB; flac -6 encodes this to a 43MB FLAC file, but flac -7 produces a 
9.1GB (!) file.

The enormous file does seem to be perfectly valid, FWIW -- it 
(eventually) decodes to a WAV that's identical to the source file.

The copyright on the offending file belongs to the band that uploaded it 
to our service, so I can't provide it as a public download, but I can 
supply it to a developer privately.

Command lines and encoder output is as follows:

lsd at cletus:~/projects/flac-bug$ time ./flac/src/flac/flac -f -7 -o 
/data/moredata/flac-bug/7.flac 2303997286.wav

flac 1.3.0, Copyright (C) 2000-2009, 2011-2013  Josh Coalson & Xiph.Org 
Foundation
flac comes with ABSOLUTELY NO WARRANTY.  This is free software, and you are
welcome to redistribute it under certain conditions.  Type `flac' for 
details.

2303997286.wav: WARNING: legacy WAVE file has format type 1 but 
bits-per-sample=24
2303997286.wav: WARNING: skipping unknown chunk 'cue ' (use 
--keep-foreign-metadata to keep)
2303997286.wav: wrote 9708061456 bytes, ratio=164.494

real    2m18.059s
user    0m34.836s
sys     0m4.480s

lsd at cletus:~/projects/flac-bug$ time ./flac/src/flac/flac -f -6 -o 
/data/moredata/flac-bug/6.flac 2303997286.wav

flac 1.3.0, Copyright (C) 2000-2009, 2011-2013  Josh Coalson & Xiph.Org 
Foundation
flac comes with ABSOLUTELY NO WARRANTY.  This is free software, and you are
welcome to redistribute it under certain conditions.  Type `flac' for 
details.

2303997286.wav: WARNING: legacy WAVE file has format type 1 but 
bits-per-sample=24
2303997286.wav: WARNING: skipping unknown chunk 'cue ' (use 
--keep-foreign-metadata to keep)
2303997286.wav: wrote 44402581 bytes, ratio=0.752

real    0m1.471s
user    0m1.368s
sys     0m0.065s

Thanks
Leigh