From: "Måns Rullgård" <mans@mansr.com>
To: Martin Ratinaud <martinratinaud@gmail.com>
Cc: sox-users@lists.sourceforge.net
Subject: Re: Wav to Mp3 leads to an mp3 file that has a longer duration
Date: Mon, 16 Dec 2019 11:48:54 +0000 [thread overview]
Message-ID: <yw1xv9qgwkwp.fsf@mansr.com> (raw)
In-Reply-To: <CAKy7tYjNmTxeuYL9wSksye7P=swccp_SpLrznN2tV80fK_PR2Q@mail.gmail.com> (Martin Ratinaud's message of "Wed, 11 Dec 2019 18:26:21 +0400")
Martin Ratinaud <martinratinaud@gmail.com> 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@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sox-users
next prev parent reply other threads:[~2019-12-16 11:49 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-11 14:26 Wav to Mp3 leads to an mp3 file that has a longer duration Martin Ratinaud
2019-12-11 17:18 ` Jeremy Nicoll - ml sox users
2019-12-12 4:18 ` Martin Ratinaud
2019-12-12 17:05 ` Jeremy Nicoll - ml sox users
2019-12-16 5:10 ` Martin Ratinaud
2019-12-16 11:48 ` Måns Rullgård [this message]
2019-12-16 12:02 ` Martin Ratinaud
2019-12-16 13:30 ` Måns Rullgård
2019-12-16 13:36 ` Martin Ratinaud
2019-12-16 17:44 ` Måns Rullgård
2019-12-17 10:04 ` Martin Ratinaud
2019-12-17 10:50 ` Måns Rullgård
2019-12-18 4:00 ` Martin Ratinaud
2019-12-18 7:43 ` Mikko Olkkonen
2019-12-18 9:06 ` Martin Ratinaud
2019-12-19 9:52 ` Mikko Olkkonen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-list from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://lists.sourceforge.net/lists/listinfo/sox-users
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=yw1xv9qgwkwp.fsf@mansr.com \
--to=sox-users@lists.sourceforge.net \
--cc=martinratinaud@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/sox.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).