mp3read and mp3write

Improved reading and writing of mp3 files

Description

These versions of mp3read and mp3write are direct drop-in replacements for wavread and wavwrite to access MPEG audio mp3 files. Features include:
 - aims to duplicate complete syntax of wavread and wavwrite
 - also supports on-the-fly downsampling and channel merging of mpg123
 - optimized for very long mp3 files - only decodes the needed portion
 - uses popen for encoding to avoid a large temporary file (when available - see my popenw mex)
 - attempts to preserve time alignment of files through read/write loop by removing "warm up" samples
 - package includes helper binaries for Linux, Windows, Mac-PPC, Mac-Intel, and Mac-Intel-64bit

Acknowledgements

The author wishes to acknowledge the following in the creation of this submission:
MP3WRITE and MP3READ

• MATLAB release: MATLAB 7.10 (2010a)
• Other requirements: Relies on external binaries mpg123, mp3info, and lame. Package includes binaries that should work, but YMMV. Documentation includes links to the sources of these programs.

[Daryush Mehta]

Works great! Commenting in the code helps the reader well. I am running Windows XP SP2 and Matlab 7.3.0 (R2006b).

As Dan Ellis notes on his website <http://labrosa.ee.columbia.edu/matlab/popenrw.html>;, two functions are available to prevent Lame from having to access a large temporary file; instead, a "pipeline" is open to the lame codec. I was able to compile Dan Ellis' popenw.c and popenr.c files ('mex popenw.c' and 'mex popenr.c' at Matlab command prompt) to give platform-specific mex files. But, when I ran the mp3write code, no error was given and no mp3 file was created. If anyone can get this functionality working, please share it!

Also, definitely read the mp3write help file to note that you can specify the bit rate by changing the last integer in
mp3write(x,fs,'filename','--quiet -h -b 128');'

Should prove to be very useful. Thanks for writing them.

[Daryush Mehta]

Forgot to mention that in my setup (WinXP SP2, Matlab 2006b), the default bit rate for mp3write turns out to be 64 kbps, not 128 kbps that's mentioned in the help file.

[Mahocan Ganemur]

Hi,

Thanks for building such a useful tool. I just tried the command "SIZ = MP3READ(FILE,'size')" on MATLAB. The resulting "total number of audio samples" value given by the command is not correct. For example in the file that I test, there are 237 931 198 total audio samples, while the command has given the result as 193 625 280. I tried on another mp3 file that is relatiely small. The correct size of this file is 41 133 311, while the command has given as 40 912 128. I cannot get the correct value of the total number of audio samples in the mp3 file with this command. Any suggestions on this issue? Thanks in advance.

[Mahocan Ganemur]

Good job!

[hrushikesh kulkarni]

great i am very thankful to you

[Jose Uy]

It doesn't seem to work with mp3's downloaded from itunes. Does the AAC encoding have anything to do with this?

[suraj prakash]

its cool.

[Aaron Clarke]

I tried it and it worked great right away. Nice program!

[loch zeng]

This is a good tools

[JG NT]

I can recommend this program! IT worked very good. Thanks

[Jorge Moragues]

As Mahocan said, the corresponding 'SIZ' command does not work properly and it returns a wrong number of samples of the file.

Has anybody solved this problem?

Thanks

[T myself]

Great tool! Works nice. Thank you.

[Gökhan Vural]

It works very nice overally. However, it gives ".mp3 is corrupt or is not a standard MP3 file." error for some songs. Indeed, files're not corrupt.
Does anybody know the reason of it ?

[brigitte audrey]

very good stuff. thanks for sharing

[David]

and I got this error with mp3read

>> mp3read([mp3_list(i).name])
??? Error using ==> mp3read>mysystem at 373
unable to execute "C:\Documents and Settings\mfiles\mp3readwrite\mpg123.exe" -q -w "\tmp\tmp127.wav"
"DJ.mp3" ()

Error in ==> mp3read at 330
  mysystem(cmd);

[Manikandan]

I got 'Out of Memory' error. Please advice me. Thanks.

[Ilaria Milesi]

 

[Mr Smart]

 

[Jesse van Muijden]

works fine with Matlab 7.10.0 (R2010a) on Windows XP Pro SP3. Thank you!

[Han]

Thank you

[bei liu]

It's good,bur I dont know hwo to use it.