4

我想做的是在我的android项目中的特定时间将多个音频文件合并到视频文件中。

例如，有两个音频文件：a1 长度为 5 秒，a2 长度为 5 秒，视频 V1 长度为 20 秒。所以我想在 00:01s 到 00:05s 的时间将音频 a1 合并到视频 V1，在 00:10s 到 00:15s 的时间将音频 a2 合并到视频 V1。这里的“合并”是指视频文件将在特定时间从音频文件 a1 和 a2 添加画外音，而不是附加。

在谷歌和 StackOverflow 上搜索后，我找到了 Mp4Parser 库，但不幸的是，我只能将完整的音频轨道合并到视频轨道。我的问题是如何在特定时间从多个音轨合并它？

这是我使用的代码：

    public boolean mux(String videoFile, String audioFile, String outputFile) {
    Movie video;
    try {
        video = new MovieCreator().build(videoFile);
    } catch (RuntimeException e) {
        e.printStackTrace();
        return false;
    } catch (IOException e) {
        e.printStackTrace();
        return false;
    }

    Movie audio;
    try {
        audio = new MovieCreator().build(audioFile);
    } catch (IOException e) {
        e.printStackTrace();
        return false;
    } catch (NullPointerException e) {
        e.printStackTrace();
        return false;
    }
    Track audioTrack = audio.getTracks().get(0);
    List<Track> tracks = new ArrayList<Track>();
    tracks.add(video.getTracks().get(0));
    tracks.add(audioTrack);
    video.setTracks(tracks);
    Container out = new DefaultMp4Builder().build(video);
    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;
    }
    return true;
}

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);
        }
    }
}

任何帮助将不胜感激！非常感谢。

4

0 回答 0