Converting wav's to mp3's

Java Sound & OpenAL
#1

I’m trying to make a tool to convert wav’s to mp3’s then send out a notification when it’s done. (The wav’s will always be 44100Hz 16-bit Stereo files)

My first attempt was to link to JMF then attempt to do this:


	public void wavToMP3(String waveFileName, String mp3FileName) throws Exception
	{
		File file = new File(waveFileName);
		AudioInputStream in = AudioSystem.getAudioInputStream(file);
		AudioInputStream out;
		AudioFormat.Encoding encodedFormat = new AudioFormat.Encoding(javax.media.format.AudioFormat.MPEGLAYER3);
		out = AudioSystem.getAudioInputStream(encodedFormat, in);
		File outfile = new File(mp3FileName);
		AudioSystem.write(out, new AudioFileFormat.Type("MP3","mp3"), outfile);
	}

but that results in this error:

Exception in thread “main” java.lang.IllegalArgumentException: Unsupported conversion: mpeglayer3 from PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian

I can’t seem to find what I need to change to fix this, any suggestions?

#2

The JDK can’t read MP3s. You can use the JavaZoom project. It isn’t written very well, but works for most MP3s.

#3

And just on the off-chance - if you can get away with using Ogg Vorbis format instead of MP3, you can use the JOrbis library.

Cas :slight_smile:

#4

Indeed. OGG, FLAC, and APE have decent Java decoding libs.

#5

the final format needs to be mp3 to be playable in flash(this is on the server) and as far as I know it doesn’t support ogg, flac or ape

it also seems javazoom’s domain is down

#6

I found a link to JLayer and it only seems to be able to go from mp3->wav but has no way of going back again, is there a library to do this that doesn’t require an EasyJNI license?

#7

Don’t think so. Stupid, eh?

#8

I guess this will have to do:


	public void wavToMP3(String waveFileName, String mp3FileName) throws Exception
	{
		Runtime runtime = Runtime.getRuntime();
		Process proc = runtime.exec(LAME_PATH+" "+waveFileName+" "+mp3FileName);
	}