Re: [FFmpeg-user] Convert Audio Track To Numbers and Back

[Luke Davis]

On Tue, 7 Mar 2017, Michele Monteferrante wrote:


Sorry,
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 
channel.


  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   00
  0.00012481278   00
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Re: [FFmpeg-user] Convert Audio Track To Numbers and Back

[Bouke / VideoToolShed]

On 07 Mar 2017, at 03:43, Michele Monteferrante  wrote:
> 
> Sorry,
> 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.
> Ciao
> Michele

Not sure if FFmpeg can do this, but if you hire a coder he’ll be done in no 
time.
If the sound is uncompressed, it’s nothing more of finding the start of the 
actual sound data, and read the numbers.
Creating a sound file from numbers (uncompressed) is pretty easy too. (Although 
it’s your task to make it sound like ‘something’ .:-)

Now, since you want to do math on it, and you have already a nice format to 
store a couple of numbers (being X the position in the file, Y the value of the 
bits), why not stick to that as a file format as input? (And to plot, any half 
decent audio editor can plot a sound file…)

hth
Bouke


>> On 6 Mar 2017, at 10:05, Carl Eugen Hoyos  wrote:
>> 
>> 2017-03-06 4:22 GMT+01:00 Michele Monteferrante :
>>> I have a very simple task.
>> 
>>> Given an audio track (aiff or mp3) I want to convert it in series of real 
>>> numbers.
>> 
>> Are you searching for the pcm_s32be format? Or pcm_u8?
>> 
>> Carl Eugen
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Re: [FFmpeg-user] Convert Audio Track To Numbers and Back

[Michele Monteferrante]

Sorry,
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.
Ciao
Michele

> On 6 Mar 2017, at 10:05, Carl Eugen Hoyos  wrote:
> 
> 2017-03-06 4:22 GMT+01:00 Michele Monteferrante :
>> I have a very simple task.
> 
>> Given an audio track (aiff or mp3) I want to convert it in series of real 
>> numbers.
> 
> Are you searching for the pcm_s32be format? Or pcm_u8?
> 
> Carl Eugen
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> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
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> To unsubscribe, visit link above, or email
> ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".

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Re: [FFmpeg-user] Convert Audio Track To Numbers and Back

[Michele Monteferrante]

If u8 is unsigned 8 bit and pcm32 is 32 bit (4 bytes) I am searching 
for pcm32.
Many many Thanks
Michele 
> On 6 Mar 2017, at 10:05, Carl Eugen Hoyos  wrote:
> 
> 2017-03-06 4:22 GMT+01:00 Michele Monteferrante :
>> I have a very simple task.
> 
>> Given an audio track (aiff or mp3) I want to convert it in series of real 
>> numbers.
> 
> Are you searching for the pcm_s32be format? Or pcm_u8?
> 
> Carl Eugen
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> ffmpeg-user@ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
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> To unsubscribe, visit link above, or email
> ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".

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Re: [FFmpeg-user] Convert Audio Track To Numbers and Back

[Carl Eugen Hoyos]

2017-03-06 4:22 GMT+01:00 Michele Monteferrante :
> I have a very simple task.

> Given an audio track (aiff or mp3) I want to convert it in series of real 
> numbers.

Are you searching for the pcm_s32be format? Or pcm_u8?

Carl Eugen
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[FFmpeg-user] Convert Audio Track To Numbers and Back

[Michele Monteferrante]

I have a very simple task. 
Given an audio track (aiff or mp3) I want to convert it in series of real 
numbers. 
I do some kind of analysis on this numbers to obtain another series of real 
numbers 
(Corresponding to another audio file of the same duration).
At this point I want to convert it back to audio file.
That you.
Michele Monteferrante 

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