How to compress audio for filename extensions .flac(FLAC), .alac(ALAC), .wv(Wavpack) with varying bitrates ?

Hello, all,

I want to ask about audio compression with bitrate,

How to compress audio for filename extensions .flac(FLAC), .alac(ALAC), .wv(Wavpack) with varying bitrates ?

I have tried with the code below, but there is an error

[y,Fs]=audioread('water.flac');
audiowrite('waterkompres.flac',y,Fs,'BitRate',128);

So is there any other simple coding?

or what should we do to remove the error in the coding?

thank you very much

Answer 1

[Walter Roberson]

Bitrate: "Only available for MPEG-4 (.m4a, .mp4) files."

so you will not be able to do it using audiowrite() and will need to find third party libraries or tools.

[sisi chalisva]

thank you

but I've tried using .m4a. format

[y,Fs]=audioread('water.m4a');
audiowrite('waterkompresflac.m4a',y,Fs,'BitRate',256);

but still error

this is an error

Error using audiowrite>validateExtension (line 379)

Incorrect file extension for file waterkompresflac.m4a.

Supported extensions are:

.flac

.oga

.ogg

.wav

Error in audiowrite>validateFilename (line 394)

validateExtension(filepath.Extension,filename)

Error in audiowrite (line 165)

[props.filename, fileExisted] = validateFilename( props.filename );

Error in test4 (line 5)

audiowrite('waterkompresflac.m4a',y,Fs,'BitRate',256);

therefore which part of the program should be replaced to get rid of the error ?

I'm sorry, i can't speak english very well

thanks for your help

[Walter Roberson]

I suspect you are using Linux; .m4a is supported on Mac and Windows.

[sisi chalisva]

I use matlab online free trial

And I'm a windows 8 user

I can't download the app because my laptop's memory is full

[Walter Roberson]

MATLAB Online uses Linux.

Perhaps you could archive some of your files onto a USB memory stick, and then load MATLAB onto your laptop.

[sisi chalisva]

ok, I'll try

it means there is no problem with the program, right?

[Walter Roberson]

It does not matter what kind of file you read from; it matters what kind of file you write to, and that you get the right rate.

[y,Fs]=audioread('water.m4a');
yr = resample(y, 44100, Fs);
audiowrite('waterkompresflac.m4a',yr,4r100,'BitRate',256);

[sisi chalisva]

oke Mr. Walter

I'll try

thank you very much