[FFmpeg-user] Convert Audio Track To Numbers and Back
l1 at newanswertech.com
Mon Mar 13 13:25:04 EET 2017
On Tue, 7 Mar 2017, Michele Monteferrante wrote:
> I was not clear. What I want is a function of time, a graph.
> x: time in seconds
> Y: amplitude in whatever format
> This file must be a simple text file which,for example, I can plot with
> Gnuplot and edit whit vim.
Would maybe SoX be a better tool for this? Something like the --plot option?
Or, possibly using the .dat output mechanism?
(I.E. sox infile.mp3 outfile.dat)
>From the soxformat man page:
.dat Text Data files. These files contain a textual representation of the
sample data. There is one line at the beginning that contains the sam-
ple rate, and one line that contains the number of channels.
Subsequent lines contain two or more numeric data intems: the time since the
beginning of the first sample and the sample value for each
Values are normalized so that the maximum and minimum are 1 and
-1. This file format can be used to create data files for external programs
such as FFT analysers or graph routines. SoX can also convert a
file in this format back into one of the other file formats.
Example containing only 2 stereo samples of silence:
; Sample Rate 8012
; Channels 2
0 0 0
0.00012481278 0 0
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