[ecasound] Fade-in/Fade-out

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Subject: [ecasound] Fade-in/Fade-out
From: Michael Carmack (karmak_AT_karmak.org)
Date: Sun Apr 21 2002 - 20:06:03 EEST

There's probably a simple answer to this question, but I haven't quite
got the hang of ecasound yet and I'm under a bit of a deadline to put
a simple fade-in/fade-out on some sound clips ripped from a CD. What
I've been doing to put a 1-second fade-in/fade-out is the following:

1. Rip a snippet of a track from a CD -- call it clip.wav. For this
   example, we'll assume it's a 30-second clip:

2. Run the following commands

    ecasound clip.wav -ea -kl:1,0,100,1 -t:29 -o clip1.wav
    ecasound clip.wav -ea -kl:1,100,0,1 -y:29 -o clip2.wav
    ecasound -i clip2.wav -o clip1.wav -y:29
    mv clip1.wav clip.wav

For the most part this seems to work, but the issues are:

  (1) It seems a bit clumsy--is there a more direct way to do this?
  (2) Occasionally I get a 'hiccup' where the two files are patched
      together (the third command above).

Any suggestions?

Thanks,
m. 

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