Convert Video to MP3

Question

I want to Convert Video(mp4) to Mp3 format. Please if any one know then explain me.

I have tried this but its not working.

I have implement from this link but it wont work for me. How do I extractor audio to mp3 from mp4 using java in Android?

public class AudioFromVideo  {

    private String audio, video;
    private MediaCodec amc;
    private MediaExtractor ame;
    private MediaFormat amf;
    private String amime;

    public AudioFromVideo(String srcVideo, String destAudio) {
        this.audio = destAudio;
        this.video = srcVideo;
        ame = new MediaExtractor();
        init();
    }

    public void init() {
        try {
            ame.setDataSource(video);
            amf = ame.getTrackFormat(1);
            ame.selectTrack(1);
            amime = amf.getString(MediaFormat.KEY_MIME);
            amc = MediaCodec.createDecoderByType(amime);
            amc.configure(amf, null, null, 0);
            amc.start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void start() {
        new AudioService(amc, ame, audio).start();
    }

    private class AudioService extends Thread {
        private MediaCodec amc;
        private MediaExtractor ame;
        private ByteBuffer[] aInputBuffers, aOutputBuffers;
        private String destFile;

        @SuppressWarnings("deprecation")
        AudioService(MediaCodec amc, MediaExtractor ame, String destFile) {
            this.amc = amc;
            this.ame = ame;
            this.destFile = destFile;
            aInputBuffers = amc.getInputBuffers();
            aOutputBuffers = amc.getOutputBuffers();
        }

        @SuppressWarnings("deprecation")
        public void run() {
            try {
                OutputStream os = new FileOutputStream(new File(destFile));
                long count = 0;
                while (true) {
                    int inputIndex = amc.dequeueInputBuffer(0);
                    if (inputIndex == -1) {
                        continue;
                    }
                    int sampleSize = ame.readSampleData(aInputBuffers[inputIndex], 0);
                    if (sampleSize == -1) break;
                    long presentationTime = ame.getSampleTime();
                    int flag = ame.getSampleFlags();
                    ame.advance();
                    amc.queueInputBuffer(inputIndex, 0, sampleSize, presentationTime, flag);
                    MediaCodec.BufferInfo info = new MediaCodec.BufferInfo();
                    int outputIndex = amc.dequeueOutputBuffer(info, 0);
                    if (outputIndex >= 0) {
                        byte[] data = new byte[info.size];
                        aOutputBuffers[outputIndex].get(data, 0, data.length);
                        aOutputBuffers[outputIndex].clear();
                        os.write(data);
                        count += data.length;
                        Log.e("write", "" + count);
                        amc.releaseOutputBuffer(outputIndex, false);
                    } else if (outputIndex == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
                        aOutputBuffers = amc.getOutputBuffers();
                    } else if (outputIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
                    }
                }
                os.flush();
                os.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}

new AudioFromVideo(videopath,audioPath).start();

Please explain, **in detail**, what "its not working" and "it wont work for me" means. — CommonsWare, Sep 21 '16 at 11:49
it will give me nullpointer at aInputBuffers = amc.getInputBuffers(); this line — Kinjal, Sep 21 '16 at 13:26
can anyone help me to convert mp3 into mp4 ?(audio to video conversion) and there will be image which i have to display in video ... i cannot post a question and i am in need — Drashti, Jan 17 '19 at 12:17

score 4 · Accepted Answer · answered Oct 06 '16 at 12:55

4

You will need to extract Audio from Mp4 Videos using Android FFmpeg Library:

ffmpeg -i my_video.mp4 -ab 128k -ac 2 -ar 44100 -vn my_audio.mp3

Here is link to the library that does this:

http://writingminds.github.io/ffmpeg-android-java/

http://www.android-arsenal.com/details/1/931

answered Oct 06 '16 at 12:55

Umair Adil

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read [how-to-answer](http://stackoverflow.com/help/how-to-answer) post code part .. external link may not be forever. – Maveňツ Dec 01 '16 at 05:10

score 3 · Answer 2 · answered Apr 21 '20 at 08:16

It is possible to extract audio form vidoe file in android programmatically. You can do this without using any external library. It can be done by using MediaMuxer class.

new AudioExtractor().genVideoUsingMuxer("Video source Path", "Audio destination path", -1, -1, true, false);

See this post fro better understanding and complete code.

https://androidprogrammatically425516919.wordpress.com/2020/04/21/how-to-convert-video-to-audio-in-android-programmatically/

Convert Video to MP3

2 Answers2