JAVA - Xuggler - 结合 MP3 音频文件和 MP4 电影

Question

使用 JAVA 和 Xuggler - 以下代码组合了一个 MP3 音频文件和一个 MP4 电影文件，并输出了一个组合的 mp4 文件。

我希望输出视频的持续时间等于输入视频文件的持续时间

如果我将循环条件设置为:

while (containerVideo.readNextPacket(packetvideo) >= 0) 

它提供 400 次迭代 - 使电影运行 15 秒。完全符合我的要求。

但由于某种原因，音频在 10 秒后被切断 - 使电影的最后 5 秒无声。

看起来视频 IStreamCoder 的单次迭代的持续时间与音频 IStreamCoder 的单次迭代的持续时间不同。

如何让声音充满电影的整个 15 秒？

    String inputVideoFilePath = "in.mp4";
    String inputAudioFilePath = "in.mp3";
    String outputVideoFilePath = "out.mp4";

    IMediaWriter mWriter = ToolFactory.makeWriter(outputVideoFilePath);

    IContainer containerVideo = IContainer.make();
    IContainer containerAudio = IContainer.make();

    // check files are readable
    if (containerVideo.open(inputVideoFilePath, IContainer.Type.READ, null) < 0)
        throw new IllegalArgumentException("Cant find " + inputVideoFilePath);
    if (containerAudio.open(inputAudioFilePath, IContainer.Type.READ, null) < 0)
        throw new IllegalArgumentException("Cant find " + inputAudioFilePath);

    // read video file and create stream
    IStreamCoder coderVideo = containerVideo.getStream(0).getStreamCoder();
    if (coderVideo.open(null, null) < 0)
        throw new RuntimeException("Cant open video coder");
    IPacket packetvideo = IPacket.make();
    int width = coderVideo.getWidth();
    int height = coderVideo.getHeight();

    // read audio file and create stream
    IStreamCoder coderAudio = containerAudio.getStream(0).getStreamCoder();
    if (coderAudio.open(null, null) < 0)
        throw new RuntimeException("Cant open audio coder");
    IPacket packetaudio = IPacket.make();

    mWriter.addAudioStream(1, 0, coderAudio.getChannels(), coderAudio.getSampleRate());
    mWriter.addVideoStream(0, 0, width, height);

    while (containerVideo.readNextPacket(packetvideo) >= 0) {

        containerAudio.readNextPacket(packetaudio);

        // video packet
        IVideoPicture picture = IVideoPicture.make(coderVideo.getPixelType(), width, height);
        coderVideo.decodeVideo(picture, packetvideo, 0);
        if (picture.isComplete()) 
            mWriter.encodeVideo(0, picture);

        // audio packet 
        IAudioSamples samples = IAudioSamples.make(512, coderAudio.getChannels(), IAudioSamples.Format.FMT_S32);
        coderAudio.decodeAudio(samples, packetaudio, 0);
        if (samples.isComplete()) 
            mWriter.encodeAudio(1, samples);

    }

    coderAudio.close();
    coderVideo.close();
    containerAudio.close();
    containerVideo.close();
    mWriter.close();

Answer 1

不错的代码。谢谢。要捕获剩余的音频，请在末尾添加一个循环以读取音频数据包，直到没有更多为止。

    while (samples.isComplete() ) {
        containerAudio.readNextPacket(packetaudio);
        coderAudio.decodeAudio(samples, packetaudio, 0);
        writer.encodeAudio(iAudioStream, samples);
        Utility.console(String.format("%s %d", Utility.timeStamp(),
            samples.getPts() ));            
    }