How can I change the bittrate and the sample rate of the MP3

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rita1075
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Post by rita1075 »

Hello, I am Eunah Choi, a newbie to Librivox, who just have signed in yesterday.
I plan to record one of Shakespeare's sonnets and submit it into the short poetry collection.
Actually, I have already recorded Sonnet XVIII using my IRivir, and the MP3 file is stored in my hard drive.
The file was recorded as a 32kbps 32khz MP3.
I imported the 32kbps file which was recorded with my IRiver to the Audacity, and I exported it as a 128kbps MP3 file.
The file was exported successfully, but I couldn't change the sample rate from 32khz to 44khz, which, I think, the standard sample rate applied to all Librivox recordings.
:?
How can I change the bittrate and sample rate of an MP3 file using Audacity?
Is it still possible to submit the 128kbps 32khz MP3 file to the collection anyway?
Please give a few words of advice on this problem.

Thank you.
Eunah Choi
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jimmowatt
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Post by jimmowatt »

If you use a PC then you're looking for a file called CDex
A wonderful program that can do many things with files and it's free.
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kristin
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Post by kristin »

Another program that you can use to change that is WavePad. Convert sample rate is under the File menu.

http://www.nch.com.au/wavepad/index.html
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Planish
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Post by Planish »

Once you've got it at a given sample rate, is there any point at all to resampling it to a higher rate? Unless you really just like larger file sizes for no gain in quality.

Besides, 44 kHz is nearly three times higher than the 15 kHz audio from an FM broadcast.
There is no frigate like a book / To take us lands away,
Nor any coursers like a page / Of prancing poetry.
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Stephan
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Post by Stephan »

Jimmowatt,
i went from cdex (which is specialized in ripping CDs really) to Razorlame (which is speciallized in mp3-conversion with lame).

It's free too and even lighter and easier to setup.
What it can't do is a "normalize" while processing the files.
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jimmowatt
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Post by jimmowatt »

Stephan
You need levelator to normalise the files but it is a seperate process.
It would be nice to combine all these various steps we put files through.

Thanks for the pointer to razorlame.
I'll have a look
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Gesine
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Post by Gesine »

rita1075 wrote:Hello, I am Eunah Choi, a newbie to Librivox, who just have signed in yesterday.
I plan to record one of Shakespeare's sonnets and submit it into the short poetry collection.
Actually, I have already recorded Sonnet XVIII using my IRivir, and the MP3 file is stored in my hard drive.
The file was recorded as a 32kbps 32khz MP3.
I imported the 32kbps file which was recorded with my IRiver to the Audacity, and I exported it as a 128kbps MP3 file.
The file was exported successfully, but I couldn't change the sample rate from 32khz to 44khz, which, I think, the standard sample rate applied to all Librivox recordings.
:?
How can I change the bittrate and sample rate of an MP3 file using Audacity?
Is it still possible to submit the 128kbps 32khz MP3 file to the collection anyway?
Please give a few words of advice on this problem.

Thank you.
Eunah Choi
Uhm actually there's no need to change it at all. 32K is fine as a sample rate - we accept 22K to 44.1K - see this article for further information: http://librivox.org/wiki/moin.cgi/TechSpecs
"Imagination is more important than knowledge. Knowledge is limited. Imagination circles the world." Albert Einstein
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kayray
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Post by kayray »

No no no, please, we need 44,100.
Other rates produce chipmunk voices in the archive.org flash player.
Gesine, could you change the wiki page? Get rid of everything that says anything other than 44100 is ok, would you? It won't let me log in.
Kara
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--------
"Mary wished to say something very sensible into her Zoom H2 Handy Recorder, but knew not how." -- Jane Austen (& Kara)
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Gesine
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Post by Gesine »

Oh - when did this come out? OK, I'll change it.
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Gesine
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Post by Gesine »

Changed wiki to this:
But using other sample rates than 44.1 kHz is better suited to voice recording, isn't it?
There has been a lot of discussion, since there are tempting reasons to use other sample rates. Therefore the complete official version is the following:
  1. 44.1 kHz is the default sample rate in lots of software. We need to get files at this rate because this is what our host, archive.org, uses for its flash player
  2. Please don't use any rate other than 44,100 Hz. If you accidentally send us something at these rates, our catalogers will resample it for you and advise you on how to record at a sample rate we can use. Don't worry, your work will never be wasted!
"Imagination is more important than knowledge. Knowledge is limited. Imagination circles the world." Albert Einstein
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kayray
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Post by kayray »

Thank you very very much -- I changed the BC template aeons ago but forgot about the wiki.
Kara
http://kayray.org/
--------
"Mary wished to say something very sensible into her Zoom H2 Handy Recorder, but knew not how." -- Jane Austen (& Kara)
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Gesine
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Post by Gesine »

Ah - thought we only took it out of the BC template to avoid clutter. Anyway, good to know - just now I'm cataloguing a project and there's a 32K file which I would have let through. :)
"Imagination is more important than knowledge. Knowledge is limited. Imagination circles the world." Albert Einstein
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Planish
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Post by Planish »

kayray wrote:No no no, please, we need 44,100.
Other rates produce chipmunk voices in the archive.org flash player.
That's a very good reason. Thanks
There is no frigate like a book / To take us lands away,
Nor any coursers like a page / Of prancing poetry.
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