[FFmpeg-user] Conversion wav -> mp3 -> wav

Reindl Harald h.reindl at thelounge.net
Fri Jun 23 01:54:33 EEST 2017

Am 22.06.2017 um 22:20 schrieb Rodolfo Medina:
> As an experiment, I converted a .wav file to mp3 format and then back into wav
> again, just to see what happens:
>   $ ffmpeg -i file1.wav file1.mp3
>   $ ffmpeg -i file1.mp3 file2.wav
> I've always heard and read that the first step produces a loss in quality.  So
> I would expect that to be seen in a reduction of size.  Instead, I was suprised
> to see that file1.wav and file2.wav are both 154M large.  Also the output of
> `ffmpeg -i' is almost the same for the two: in both cases, there is:
>   Duration: 00:15:10.84, bitrate: 1411 kb/s
>      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
> So I wonder, and am asking to you listers, in where that quality loss is shown
> and how it can be detected.  Or maybe should we think and conclude that the
> original quality is restored with the second step...?

common sense - something which got lost in step1 can not be restored in 
step 2 - it's really that simple

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