[flac-dev] Message about compression ratio with stdin input

Erik de Castro Lopo mle+la at mega-nerd.com
Tue Jul 1 03:25:48 PDT 2014

lvqcl wrote:

> Reproducible with the following command line:
> flac --ignore-chunk-sizes - -o out.flac < test.wav

> src/flac/flac --ignore-chunk-sizes - -o a.flac < flac-test-stereo.wav 

I get this:

    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.

    INFO: Make sure you know what you're doing when using --ignore-chunk-sizes.
          Improper use can cause flac to encode non-audio data as audio.
    -: WARNING: skipping unknown chunk 'LIST' (use --keep-foreign-metadata to keep)
    -: WARNING: 'data' chunk has non-zero size, using --ignore-chunk-sizes is probably a bad idea
    (No runtime statistics possible; please wait for encoding to finish...)
    (No runtime statistics possible; please wait for encoding to finish...)
    -: INFO: hit EOF with --ignore-chunk-sizes, got 148471808 samples
    FAILURE: Compression failed (ratio 7742270.591, should be < 1.0).
    This happens for some files for one or more of the following reasons:
     * Recompressing an existing FLAC from a higher to a lower compression setting.
     * Insufficient input data  (eg, very short files, < 10000 frames).
     * The audio data is not compressable (eg a full range white noise signal).

Removing the last four lines is easy but is it sufficient?

Erik de Castro Lopo

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