[FFmpeg-user] Segment sound to multiple Waveform images

[Bouke (VideoToolShed)]

Hi guys,
Trying to split a soundfile to generate multiple audio waveform images.

ffmpeg.exe -i K:\test\test.wav -f segment -segment_time 8  -filter_complex 
"aformat=channel_layouts=mono,compand,showwavespic=s=640x120" -f image2 
K:\test\test_%03d.png

However, this gives me just one file, showing the entire duration of the 
sound clip. What am I missing here?

To make it slightly more complex, if this can be done, how can I make the 
last file to have the same timescale as the other ones?
(say the file is 12 seconds, the first image would show second 0 to 8, and I 
want the second one to be as wide, but have the audio data show only in the 
first half of the image.)

thx,

Bouke

 -- "ffmpeg version N-79253-g8005b6d Copyright (c) 2000-2016 the FFmpeg 
developers
  built with gcc 5.3.0 (GCC)
  configuration --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth 
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  libavutil      55. 20.100 / 55. 20.100
  libavcodec     57. 34.100 / 57. 34.100
  libavformat    57. 30.100 / 57. 30.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 40.102 /  6. 40.102
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Guessed Channel Layout for  Input Stream #0.0  stereo
Input #0, wav, from 'K\test\test.wav'
  Metadata
    encoder          Lavf57.30.100
  Duration 000104.08, bitrate 1536 kb/s
    Stream #00 Audio pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 
channels, s16, 1536 kb/s
Output #0, image2, to 'K\test\test_%03d.png'
  Metadata
    encoder          Lavf57.30.100
    Stream #00 Video png, rgba, 640x120 [SAR 11 DAR 163], q=2-31, 200 kb/s, 
75 fps, 75 tbn, 75 tbc
    Metadata
      encoder          Lavc57.34.100 png
Stream mapping
  Stream #00 (pcm_s16le) -> aformat
  showwavespic -> Stream #00 (png)
Press [q] to stop, [?] for help
frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=000000.01 bitrate=N/A 
speed=0.0452x
video12kB audio0kB subtitle0kB other streams0kB global headers0kB muxing 
overhead unknown



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