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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=MWBEd5rFUFIkVloaxys8QIcvZ2WnzNmYANhkvalaxTk=; b=aGYrU3QRXSHNZab00+txPdA6PYaJUXVw8hh1q8Z4k0aIwUKTYV6ku+z/llq90vAXtf 8BG299SYPK580nFl9TwADwoHqhsEm/CCl9lt/NUZQiMXujmVkCbnXH1lGIBRvgasyN87 xuVMwf2Ko3tft9Z/+5/KysWBVLhRt44j2bVmniLwwOy3iy6G5UXmfs7c/T19F/mj8oFS iAG6xfftS3simec7ST4sLtWQaxykPU328sEJc4DeG2sAoqwb6l0COsPk+maGqceZcRUf 0Scb3WXRXXlnCVjqP/jwjS46Nrv8BwPjXtWEY5E1gNTaDrpS0NXJvzZavgUTGsBcehhJ 4Vbg== X-Gm-Message-State: APjAAAUwndXK5rkVjLZHZ+0HssqDx/kAoelVOLQof507pPiezYIhzNWU 0iY/clxip6mPXpFW1HXRdb6YWAxmmoLZMTv4fw== X-Google-Smtp-Source: APXvYqy9CcmxLUwhO9TMWiOE2nbTTj6W8YIsflwqL6/T4LbbF/W5+tPyiJz9agIth4jsF25PHUqXhcIwTChR8eRL1g4= X-Received: by 2002:a0c:ecc6:: with SMTP id o6mr3776185qvq.220.1576577071702; Tue, 17 Dec 2019 02:04:31 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Martin Ratinaud Date: Tue, 17 Dec 2019 14:04:04 +0400 Message-ID: To: =?UTF-8?B?TcOlbnMgUnVsbGfDpXJk?= X-Headers-End: 1ih9iX-001gXY-Qg Subject: Re: Wav to Mp3 leads to an mp3 file that has a longer duration X-BeenThere: sox-users@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: sox-users@lists.sourceforge.net Cc: sox-users@lists.sourceforge.net Content-Type: multipart/mixed; boundary="===============5339382782376299506==" Errors-To: sox-users-bounces@lists.sourceforge.net --===============5339382782376299506== Content-Type: multipart/alternative; boundary="00000000000051e9460599e3743c" --00000000000051e9460599e3743c Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Thanks for the tip! What codec should I use then ? Thanks ----------------------------------------------------------------------- *Martin RATINAUD* ----------------------------------------------------------------------- On Mon, Dec 16, 2019 at 9:44 PM M=C3=A5ns Rullg=C3=A5rd wr= ote: > Martin Ratinaud writes: > > > Ok, thanks. > > > > But would it be possible to > > - add silence samples at the end of the wav file so that is is a multip= le > > of 1152 > > - convert it to an mp3 > > - and get the exact same number of samples with no change between wav > > duration and mp3 duration > > > > Because I just test with a wav file that is 8640000 samples =3D 7500 * = 1152 > > and when I convert it to an mp3, I get 8641152 samples > > Apparently the LAME encoder is adding an extra frame for some reason. > MP3 is weird like this. If you need the number of samples to be exact, > you'll have to switch a more modern codec. > > -- > M=C3=A5ns Rullg=C3=A5rd > --00000000000051e9460599e3743c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Thanks for the tip!=C2=A0

What codec sh= ould I use then ?

Thanks
= ------------------------------------= -----------------------------------
Martin RATINAUD
---------------= --------------------------------------------------------
=

On Mon, Dec 16, 2019 at 9:44 PM M=C3=A5ns Rullg=C3=A5rd <mans@mansr.com> wrote:
Martin Ratinaud <martinratinaud@gmail.com<= /a>> writes:

> Ok, thanks.
>
> But would it be possible to
> - add silence samples at the end of the wav file so that is is a multi= ple
> of 1152
> - convert it to an mp3
> - and get the exact same number of samples with no change between wav<= br> > duration and mp3 duration
>
> Because I just test with a wav file that is 8640000 samples =3D 7500 *= 1152
> and when I convert it to an mp3, I get 8641152 samples

Apparently the LAME encoder is adding an extra frame for some reason.
MP3 is weird like this.=C2=A0 If you need the number of samples to be exact= ,
you'll have to switch a more modern codec.

--
M=C3=A5ns Rullg=C3=A5rd
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