Martin Ratinaud <martinratinaud@xxxxxxxxx> writes: > 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 ? That difference is due to a rounding error in the stream length calculation. > 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. >> >> > > _______________________________________________ > Sox-users mailing list > Sox-users@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/sox-users > -- Måns Rullgård _______________________________________________ Sox-users mailing list Sox-users@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/sox-users
