[SoX-devel] [ sox-Bugs-2779041 ] spectrogram PNG file is invalid on Windows

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Bugs item #2779041, was opened at 2009-04-22 16:08
Message generated for change (Tracker Item Submitted) made by glenndavis
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: gdavis (glenndavis)
Assigned to: Nobody/Anonymous (nobody)
Summary: spectrogram PNG file is invalid on Windows

Initial Comment:
I'm using Sox 14.2.0 and Windows 2000.
Sox makes spectrogram.PNG OK, but no program I tried can open it.
I looked at the header in binary, and it seems to have extra bytes.

Here is the program output:

F:\audio\creek\sweep>f:\install\sox\sox-14.2.0\sox.exe -V -V  -n -n synth 6 tri 10k:14k spectrogram -x 10
/cygdrive/f/install/sox/sox-14.2.0/sox: SoX v14.2.0
time:  Nov  8 2008 19:35:10
uname: CYGWIN_NT-5.0 athlon-64 1.5.25(0.156/4/2) 2008-06-12 19:34 i686
gcc:   3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
arch:  1248 48 44 L
/cygdrive/f/install/sox/sox-14.2.0/sox nulfile: sample rate not specified; using 48000

Input File     : '' (null)
Channels       : 1
Sample Rate    : 48000
Precision      : 32-bit


Output File    : '' (null)
Channels       : 1
Sample Rate    : 48000
Precision      : 32-bit

/cygdrive/f/install/sox/sox-14.2.0/sox synth: type=triangle, combine=create, samples_to_do=288000, f1=10000,
ffset=0, phase=0, p1=0.5, p2=-1, p3=-1 mult=0.00694444
/cygdrive/f/install/sox/sox-14.2.0/sox spectrogram: window_density=0.499512
/cygdrive/f/install/sox/sox-14.2.0/sox spectrogram: step_size=480 block_steps=10
/cygdrive/f/install/sox/sox-14.2.0/sox sox: effects chain: input      48000Hz 1 channels 32 bits (multi)
/cygdrive/f/install/sox/sox-14.2.0/sox sox: effects chain: synth      48000Hz 1 channels 32 bits (multi)
/cygdrive/f/install/sox/sox-14.2.0/sox sox: effects chain: spectrogram 48000Hz 1 channels 32 bits
/cygdrive/f/install/sox/sox-14.2.0/sox sox: effects chain: output     48000Hz 1 channels 32 bits (multi)
/cygdrive/f/install/sox/sox-14.2.0/sox spectrogram: cols=59 left=208 end=-208
/cygdrive/f/install/sox/sox-14.2.0/sox spectrogram: flushed cols=60 left=0 end=-272
/cygdrive/f/install/sox/sox-14.2.0/sox spectrogram: signal-max=-2.70008

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