Combine a music.m4a on a video.mp4 overwrite my video audio

[mico81]

Hi,
I need to combine a song (.m4a) with a video (.mp4). I'm using mp4Parser, it's worked but my song overwrite the audio track of my video, and I need to have these two audio tracks on my video.
Can you help me please ?
There is my function for muxing my video with a song 👍

videoFile : mp4
audioFile : m4a
outputFile : mp4

public boolean mux(String videoFile, String audioFile, String outputFile) {

    Movie video;
    try {
        video = new MovieCreator().build(videoFile);
        Log.d("ATTENTION","On a fini le try du montage de video");
    } catch (RuntimeException e) {
        e.printStackTrace();
        return false;
    } catch (IOException e) {
        e.printStackTrace();
        return false;
    }

    Movie audio;
    try {
        audio = new MovieCreator().build(audioFile);
        Log.d("ATTENTION","On a fini le try de montage de audio");
    } catch (IOException e) {
        e.printStackTrace();
        return false;
    } catch (NullPointerException e) {
        e.printStackTrace();
        return false;
    }

    Log.d("TAILLE",String.valueOf(video.getTracks().size()));
    Track audioTrack = audio.getTracks().get(0);
    Track videoTrack = video.getTracks().get(0);
    Track videoAudioTrack = video.getTracks().get(1);
    Movie result = new Movie();

    //Append all audio and video
    result.addTrack(videoTrack);
    result.addTrack(audioTrack);
    result.addTrack(videoAudioTrack);


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

    FileOutputStream fos;
    try {
        fos = new FileOutputStream(outputFile);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        return false;
    }
    BufferedWritableFileByteChannel byteBufferByteChannel = new BufferedWritableFileByteChannel(fos);
    try {
        out.writeContainer(byteBufferByteChannel);
        byteBufferByteChannel.close();
        fos.close();
    } catch (IOException e) {
        e.printStackTrace();
        return false;
    }
    Log.d("ATTENTION","On a finis la conversion");
    return true;
}

And my BufferedWritableFileByteChannel metod 👍
private static class BufferedWritableFileByteChannel implements WritableByteChannel {
private static final int BUFFER_CAPACITY = 1000000;

    private boolean isOpen = true;
    private final OutputStream outputStream;
    private final ByteBuffer byteBuffer;
    private final byte[] rawBuffer = new byte[BUFFER_CAPACITY];

    private BufferedWritableFileByteChannel(OutputStream outputStream) {
        this.outputStream = outputStream;
        this.byteBuffer = ByteBuffer.wrap(rawBuffer);
    }

    @Override
    public int write(ByteBuffer inputBuffer) throws IOException {
        int inputBytes = inputBuffer.remaining();

        if (inputBytes > byteBuffer.remaining()) {
            dumpToFile();
            byteBuffer.clear();

            if (inputBytes > byteBuffer.remaining()) {
                throw new BufferOverflowException();
            }
        }

        byteBuffer.put(inputBuffer);

        return inputBytes;
    }

    @Override
    public boolean isOpen() {
        return isOpen;
    }

    @Override
    public void close() throws IOException {
        dumpToFile();
        isOpen = false;
    }
    private void dumpToFile() {
        try {
            outputStream.write(rawBuffer, 0, byteBuffer.position());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

Sry for my english.

[sannies]

Basically you want to merge two audio tracks to one. Players won't play two
audio tracks at the same time. This is a use case that requires decoding,
then merging and encoding into one audio track again. The MP4parser cannot
do that. I guess you'll need to use ffmpeg or the MediaCodec API.

Best Regards,
Sebastian

mico81 notifications@github.com schrieb am Mi., 1. Juli 2015 um 15:58 Uhr:

Hi,
I need to combine a song (.m4a) with a video (.mp4). I'm using mp4Parser,
it's worked but my song overwrite the audio track of my video, and I need
to have these two audio tracks on my video.
Can you help me please ?
There is my function for muxing my video with a song [image: 👍]

videoFile : mp4
audioFile : m4a
outputFile : mp4

public boolean mux(String videoFile, String audioFile, String outputFile) {

Movie video;
try {
    video = new MovieCreator().build(videoFile);
    Log.d("ATTENTION","On a fini le try du montage de video");
} catch (RuntimeException e) {
    e.printStackTrace();
    return false;
} catch (IOException e) {
    e.printStackTrace();
    return false;
}

Movie audio;
try {
    audio = new MovieCreator().build(audioFile);
    Log.d("ATTENTION","On a fini le try de montage de audio");
} catch (IOException e) {
    e.printStackTrace();
    return false;
} catch (NullPointerException e) {
    e.printStackTrace();
    return false;
}

Log.d("TAILLE",String.valueOf(video.getTracks().size()));
Track audioTrack = audio.getTracks().get(0);
Track videoTrack = video.getTracks().get(0);
Track videoAudioTrack = video.getTracks().get(1);
Movie result = new Movie();

//Append all audio and video
result.addTrack(videoTrack);
result.addTrack(audioTrack);
result.addTrack(videoAudioTrack);


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

FileOutputStream fos;
try {
    fos = new FileOutputStream(outputFile);
} catch (FileNotFoundException e) {
    e.printStackTrace();
    return false;
}
BufferedWritableFileByteChannel byteBufferByteChannel = new BufferedWritableFileByteChannel(fos);
try {
    out.writeContainer(byteBufferByteChannel);
    byteBufferByteChannel.close();
    fos.close();
} catch (IOException e) {
    e.printStackTrace();
    return false;
}
Log.d("ATTENTION","On a finis la conversion");
return true;

}

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[mico81]

Ok, i'll try with ffmpeg.
Thanks for your quick answer !

Best Regards,
Nicolas