1、android上录音AAC/MP3格式，未成功
​​​https://github.com/turkeyzhu/AACEncoder_Android ​​​2、通过mp4parser将AAC、h264、mp4格式合成MP4
https://code.google.com/p/mp4parser/(mp4parser源码)
https://github.com/sannies/mp4parser(使用mp4parser合成、转码MP4例子，该代码添加了其他东西，需要添加很多依赖库(主要是aspectjrt.jar)，可以删减。
该isoviewer-1.0-RC-35.jar包将mp4parser和aspectjrt.jar合并在一起，很好用。

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public static void main(String[] args) throws FileNotFoundException, IOException {  

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​

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        /*Movie m = new Movie(); 

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        MP3TrackImpl mp3Track = new MP3TrackImpl(new FileDataSourceImpl("D:/tracks/test__mp3.mp3")); 

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        m.addTrack(mp3Track); 

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        AACTrackImpl aacTrack = new AACTrackImpl(new FileDataSourceImpl("D:/tracks/aac-sample.aac")); 

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        m.addTrack(aacTrack); 

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        Container out = new DefaultMp4Builder().build(m); 

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        FileOutputStream fos = new FileOutputStream(new File( 

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                "D:/tracks/test__mp3.mp4")); 

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        FileChannel fc = fos.getChannel(); 

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        out.writeContainer(fc); 

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        fos.close();*/  

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​

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        // mp4音视频合成  

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        try {  

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            Movie countVideo = MovieCreator.build("D:/tracks/test__mp3.mp4");  

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            Movie countAudioEnglish = MovieCreator  

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                    .build("D:/tracks/test_ount_out.mp4");  

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            Track audioTrackEnglish = countAudioEnglish.getTracks().get(0);  

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            countVideo.addTrack(audioTrackEnglish);  

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            Container out = new DefaultMp4Builder().build(countVideo);  

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            FileOutputStream fos = new FileOutputStream(new File(  

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                    "D:/tracks/test_out______.mp4"));  

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            out.writeContainer(fos.getChannel());  

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            fos.close();  

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        } catch (IOException e) {  

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            e.printStackTrace();  

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        }  

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    }

3、通过FFMPEG PCM、WAV转mp4。看代码是通过ffmpeg命令转码，ffmpeg支持转码，应该都可以实现，可先用命令试试资源。

File source = new File("D:/audio.wav");  
        File target = new File("D:/result.mp4");  
        AudioAttributes audio = new AudioAttributes();  
        audio.setCodec(null);  
        EncodingAttributes attrs = new EncodingAttributes();  
        attrs.setFormat("mp4");  
        attrs.setAudioAttributes(audio);  
        Encoder encoder = new Encoder();  
        try {  
            encoder.encode(source, target, attrs);  
        } catch (IllegalArgumentException e) {  
            e.printStackTrace();  
        } catch (InputFormatException e) {  
            e.printStackTrace();  
        } catch (EncoderException e) {  
            e.printStackTrace();  
        }

WAV转AAC命令==ffmpeg -i aec_out.wav -strict -2 -b:a 32k -y abc.aac(代码实现可以参考ffmpeg支持windows和linux库源码)

4、录音MP3格式

通过lame实现，没有库源码，有android源码