Question

使用JAVA和Xuggler - 以下代码组合了MP3音频文件和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。就像我想要的那样。

但由于某种原因，音频在10秒后被切断 - 使电影的最后5秒静音。

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。

如何在整个电影的15秒内播放声音？

    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

好的代码。谢谢。要捕获剩余的音频，请在末尾添加一个循环来读取音频数据包，直到不再存在为止。

    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() ));            
    }

Answer 2

我意识到这已经老了，但我遇到了它，它完全符合我的需要，但我遇到了同样的问题（我的音频过早地停止了）。 Eli的回答有效，但进行了一些调整。我在这里发布了这个变化，希望在未来的某个时候能节省一些时间。免责声明：我不太了解Xuggle，我不知道这是否是最好的方法，但我知道这是他为我完成的工作：

    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);

    }


//<added_code> This is Eli Sokal's code tweaked to work with gilad s' code

    IAudioSamples samples;
    do {
        samples = IAudioSamples.make(512, coderAudio.getChannels(), IAudioSamples.Format.FMT_S32);
        containerAudio.readNextPacket(packetaudio);
        coderAudio.decodeAudio(samples, packetaudio, 0);
        mWriter.encodeAudio(1, samples);
    }while (samples.isComplete() );

//</added_code>


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

JAVA - Xuggler - 结合MP3音频文件和MP4电影

2 个答案: