linux - 如何在 Linux 中创建 MP3 的波形图像？

Question

给定一个 MP3，我想从文件中提取波形到图像 (.png)

是否有可以满足我需要的软件包？

Answer 1

使用 sox 和 gnuplot 您可以创建基本的波形图像:

sox audio.mp3 audio.dat #create plaintext file of amplitude values
tail -n+3 audio.dat > audio_only.dat #remove comments

# write script file for gnuplot
echo set term png size 320,180 > audio.gpi #set output format
echo set output \"audio.png\" >> audio.gpi #set output file
echo plot \"audio_only.dat\" with lines >> audio.gpi #plot data

gnuplot audio.gpi #run script

要创建更简单/更漂亮的内容，请使用以下 GNU Plot 文件作为模板(将其保存为 audio.gpi):

#set output format and size
set term png size 320,180

#set output file
set output "audio.png"

# set y range
set yr [-1:1]

# we want just the data
unset key
unset tics
unset border
set lmargin 0             
set rmargin 0
set tmargin 0
set bmargin 0

# draw rectangle to change background color
set obj 1 rectangle behind from screen 0,0 to screen 1,1
set obj 1 fillstyle solid 1.0 fillcolor rgbcolor "#222222"

# draw data with foreground color
plot "audio_only.dat" with lines lt rgb 'white'

然后运行:

sox audio.mp3 audio.dat #create plaintext file of amplitude values
tail -n+3 audio.dat > audio_only.dat #remove comments

gnuplot audio.gpi #run script

基于 this answer一个类似的问题，该问题在文件格式方面更为普遍，但在所用软件方面则不太普遍。