Re: Wav to Mp3 leads to an mp3 file that has a longer duration

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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

-----------------------------------------------------------------------
Martin RATINAUD
-----------------------------------------------------------------------


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
_______________________________________________
Sox-users mailing list
Sox-users@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/sox-users

[Index of Archives]     [Linux Sound]     [ALSA Users]     [ALSA Devel]     [Linux Audio Users]     [Linux Media]     [Kernel]     [Photo Sharing]     [Gimp]     [Yosemite News]     [Linux Media]

  Powered by Linux