[Octave-bug-tracker] [bug #60888] Cannot read a FLAC from ffmpeg that sox and VLC can

[John Beale]

URL:
  <https://savannah.gnu.org/bugs/?60888>

                 Summary: Cannot read a FLAC from ffmpeg that sox and VLC can
                 Project: GNU Octave
            Submitted by: jbeale
            Submitted on: Tue 06 Jul 2021 04:16:45 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error or Warning
                  Status: None
             Assigned to: None
         Originator Name: John Beale
        Originator Email: 
             Open/Closed: Open
                 Release: 5.2.0
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

Using a Raspberry Pi 4 with Ubuntu 20.04, a .flac format audio file created by
ffmpeg v4.2.4 cannot be read by Octave audioread(). The function audioinfo()
shows the duration and sample count is incorrect and extremely large.  'sox'
can read and convert this same .flac file without trouble, as can Audacity and
VLC. Note that Octave can correctly read a .flac audio file generated by sox
created by converting the file to WAV format and then back to FLAC on the same
system.  I attach the file in question.


octave:3> info=audioinfo("fftest.flac")
info =

  scalar structure containing the fields:

    Filename = /home/ubuntu/audio/fftest.flac
    CompressionMethod =
    NumChannels =  1
    SampleRate =  8000
    TotalSamples =    9.2234e+18
    Duration =  1152921504606847
    BitsPerSample =  16
    BitRate = -1
    Title =
    Artist =
    Comment =

octave:4> [yraw, fs] = audioread("fftest.flac");
error: out of memory or dimension too large for Octave's index type

ubuntu@ubuntu:~/audio$ sox -V fftest.wav sox.flac
sox:      SoX v14.4.2
sox INFO formats: detected file format type `wav'

Input File     : 'fftest.wav'
Channels       : 1
Sample Rate    : 8000
Precision      : 16-bit
Duration       : 00:00:04.97 = 39744 samples ~ 372.6 CDDA sectors
File Size      : 79.5k
Bit Rate       : 128k
Sample Encoding: 16-bit Signed Integer PCM
Endian Type    : little
Reverse Nibbles: no
Reverse Bits   : no



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File Attachments:


-------------------------------------------------------
Date: Tue 06 Jul 2021 04:16:45 PM UTC  Name: fftest.flac  Size: 40KiB   By:
jbeale
Octave cannot read this FLAC format audio file
<http://savannah.gnu.org/bugs/download.php?file_id=51653>

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