I would like to manipulate MP3 files that I have recorded.
My main need is to decrease file size by decreasing bit rate.
I have found several freeware programs that offers this but not in a
flexible way where I am allowed to set the bit rate to any value I want.
My idea then was to create a small piece of software myself.

Is there any free MP3 component or audio lib that is easy to include in .Net?

Hi,

I find an article on the codeproject website discussing using speexenc and
speexdec command-line utilities to decrease the bit rate of an audio data:

http://www.codeproject.com/KB/cs/speexincsharp.aspx

Hope this is what you want.

Sincerely,
Linda Liu
Microsoft Online Community Support

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Hi Jakob,

How about the problem now?

If you have any question, please feel free to let me know.

Thank you for using our MSDN Managed Newsgroup Support Service!

Sincerely,
Linda Liu
Microsoft Online Community Support

Thanks for your suggestion.
As I understood Speex, it is an alternative for handling limited audio
information (like speech) for compact transmission.

In my case I have the incoming MP3 files. They can not be exchanged. The
ouput must also be MP3 files.

The problem is that the incoming source delivers MP3 files with a minimum
bit rate of 48 kbit/s and a minimum sampling frequency of 44.1 kHz. As an
average talk is 30 minutes I really would like to limit the size of the files.

By experimenting I have found out that a bit rate of 16 kbit/s and a
sampling frequency of 11 kHz makes almost no impact on the audio quality but
drastically limits the size to 3-4 Mb.

So I am still curious to find some MP3 manipulating library.

Hi Jakob,

Thank you for your reply!

I searched the Internet and found the following 3rd party tool that can
convert your MP3s to a different bitrate. It seems good although it is not
free. The following is the link introducing this tool:

http://www.zittware.com/Products/CDM...ate_conversion
.html

In addition, you may search the Internet with the keyword "mp3 compressor"
and you will get may candidates for that.

Sincerely,
Linda Liu
Microsoft Online Community Support

I have also found a couple of stand alone utilities that does the job.
It seems to be a popular area

The intention was to somehow include them in my own software to get full
control and batch enable the processing, but I guess I will have to stick to
manual handling for a while.

Thanks for your effort!

"Jakob Lithner" <jaklithn (AT) noemail (DOT) noemail> wrote


Have you looked into BASS? http://www.un4seen.com/