(mp4parser) MovieCreator.build() 不是在构建 mp4 视频的卡车 --> 所以 Movie.getTracks() 返回 null]

问题描述

我正在尝试将三个 mp4 视频合并（合并）到一个文件中。为此，我将 mp4parser 库用于 java。这是我的功能：

    public static void appendMp4List(List<String> mp4PathList,String outPutPath) throws IOException {
    List<Movie> mp4MovieList = new ArrayList<>();// Movie object collection [input]
    for (String mp4Path : mp4PathList) {// Construct each file path into a Movie object
        mp4MovieList.add(MovieCreator.build(mp4Path));
    }

    List<Track> audioTracks = new LinkedList<>();// Audio Channel Collection
    List<Track> videoTracks = new LinkedList<>();// Video channel collection

    for (Movie mp4Movie : mp4MovieList) {// Loop through the collection of Movie objects
        for (Track inMovieTrack : mp4Movie.getTracks()) {
            if ("soun".equals(inMovieTrack.getHandler())) {// Remove the audio channel from the Movie object
                audioTracks.add(inMovieTrack);
            }
            if ("vide".equals(inMovieTrack.getHandler())) {// Remove the video channel from the Movie object
                videoTracks.add(inMovieTrack);
            }
        }
    }

    Movie resultMovie = new Movie();// Result Movie object [output]
    if (!audioTracks.isEmpty()) {// Append all audio channels together
        resultMovie.addTrack(new AppendTrack(audioTracks.toArray(new Track[audioTracks.size()])));
    }
    if (!videoTracks.isEmpty()) {// Append all video channels together
        resultMovie.addTrack(new AppendTrack(videoTracks.toArray(new Track[videoTracks.size()])));
    }

    Container outContainer = new DefaultMp4Builder().build(resultMovie);// Wrap the resulting Movie object into the container
    FileChannel fileChannel = new RandomAccessFile(String.format(outPutPath),"rw").getChannel();
    outContainer.writeContainer(fileChannel);// Write the contents of the container to disk
    fileChannel.close();

    System.out.println(getVideoDuration(outPutPath));
}

问题出在这行代码上：

mp4MovieList.add(MovieCreator.build(mp4Path));

所以 build 方法不会构建 mp4 视频的卡车和箱子。所以当在卡车上循环时：

for (Track inMovieTrack : mp4Movie.getTracks()) { ... }

getTracks() 返回空值。我将这些文件检查到快速播放器中，它们似乎没问题。 在这里，我还将这些文件上传到我的驱动器中以进行测试：

videos used in testing

当文件超过 100MB 时，mp4parser 库似乎无法解析它。

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）