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I am using a media codec class in Android (Jelly Bean) to encode PCM format to AAC. The file was encoded but no music player is able to play that file. I was not able to find any working code or proper documentation on the net. This is my code: public void doConvert() { new AsyncTask<Void, Void, Void>() { @Override protected Void doInBackground(Void... params) { try { int codecCount = MediaCodecList.getCodecCount(); for ( int i=0; i < codecCount; i++) { MediaCodecInfo info = MediaCodecList.getCodecInfoAt(i); Logger.getLogger(MainActivity.class.getSimpleName()).log(Level.INFO, info.getName()); for ( String type : info.getSupportedTypes() ) { Logger.getLogger(MainActivity.class.getSimpleName()).log(Level.INFO, type); } } File inputFile = new File( Environment.getExternalStorageDirectory().getAbsolutePath()+"/Download/Ghajini27_Mono_8Khz.wav"); //File inputFile = new File( sampleFD.get); Log.e("File", String.valueOf(inputFile.length())); FileInputStream fis = new FileInputStream(inputFile); fis.skip(44);//remove wav header File outputFile = new File( Environment.getExternalStorageDirectory().getAbsolutePath()+"/Download/out.m4a"); if ( outputFile.exists()) outputFile.delete(); FileOutputStream fos = new FileOutputStream(outputFile); //BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(outputFile)); MediaCodec codec = MediaCodec.createEncoderByType("audio/mp4a-latm"); MediaFormat outputFormat = MediaFormat.createAudioFormat("audio/mp4a-latm", 22050, 1); outputFormat.setInteger(M

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