Hi Måns and thanks very much
Though it seems the resulting file is 7939544 samples
and 7939544 / 1152 = 6891.965277777777
So it's not a multiple of 1152 unless I'm missing something ?
Cheers
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Martin RATINAUD
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Martin RATINAUD
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On Mon, Dec 16, 2019 at 3:48 PM Måns Rullgård <mans@xxxxxxxxx> wrote:
Martin Ratinaud <martinratinaud@xxxxxxxxx> writes:
> Hi all,
>
> I'm converting a file called vocals.wav to vocals.mp3
> vocals.wav
> <https://drive.google.com/file/d/1he1eCJag1G8iGkgL932jy_mXuLT_khGM/view?usp=drive_web>
> For this I'm using this command
>
> ```
> sox vocals.wav vocals.mp3
> ```
> and here is the result of the corresponding files
>
> - original file
> ```
> soxi /Users/martin/Downloads/split-test/vocals.wav
>
> Input File : '/Users/martin/Downloads/split-test/vocals.wav'
> Channels : 2
> Sample Rate : 44100
> Precision : 16-bit
> Duration : 00:03:00.00 = 7938000 samples = 13500 CDDA sectors
> File Size : 31.8M
> Bit Rate : 1.41M
> Sample Encoding: 16-bit Signed Integer PCM
> ```
>
> - converted file
> ```
> soxi /Users/martin/Downloads/split-test/vocals.mp3
>
> Input File : '/Users/martin/Downloads/split-test/vocals.mp3'
> Channels : 2
> Sample Rate : 44100
> Precision : 16-bit
> Duration : 00:03:00.04 = 7939544 samples = 13502.6 CDDA sectors
> File Size : 2.88M
> Bit Rate : 128k
> Sample Encoding: MPEG audio (layer I, II or III)
> ```
>
> You can see that the duration is not the same which is weird and the number
> of samples also changed.
> In fact, 1544 samples have been added to the beginning of the file
>
> If I try to launch `sox -V vocals.mp3 vocals-trimmed.mp3 trim 1544s` it
> does not work
MP3 files have to have a multiple of 1152 samples. This can't be
avoided. If the input isn't such a multiple, it will be padded by the
encoder.
--
Måns Rullgård
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