Online --day13 studies online learning HLS (video coding)

Online studies - Day 13 - Lecture - HLS 1 online learning online learning needs analysis

Configuration ffmpeg

The video transcoding

 

Here to begin to turn the MP4 format conversion m3u8

 What m3u8 generate cutting success

This address again buried pit, no hls path as a child, will not find the video, and there is also a pit, is host to configure video.xuecheng, com this point there is no video that documents please combined

Successfully configured a successful visit by domain name

 

 

Then there is the typical copy the code, and then paste the code, finally lecturer in explain, really feel this project water is water

The code block test file

   public void testChunk() throws IOException {
        //源文件
        File sourceFile = new File("D:\\video\\lucene.avi");
        //块文件目录
        String chunkFileFolder = "D:\\video\\chunks\\";

        //先定义块文件大小
        long chunkFileSize = 1 * 1024 * 1024;

        //块数
        long chunkFileNum = (long) Math.ceil(sourceFile.length() * 1.0 /chunkFileSize);

        //创建读文件的对象
        RandomAccessFile raf_read = new RandomAccessFile(sourceFile,"r");

        //缓冲区
        byte[] b = new byte[1024];
        for(int i=0;i<chunkFileNum;i++){
            //块文件
            File chunkFile = new File(chunkFileFolder+i);
            //创建向块文件的写对象
            RandomAccessFile raf_write = new RandomAccessFile(chunkFile,"rw");
            int len = -1;

            while((len = raf_read.read(b))!=-1){

                raf_write.write(b,0,len);
                //如果块文件的大小达到 1M开始写下一块儿
                if(chunkFile.length()>=chunkFileSize){
                    break;
                }
            }
            raf_write.close();


        }
        raf_read.close();
    }

  //测试文件合并
    @Test
    public void testMergeFile() throws IOException {
        //块文件目录
        String chunkFileFolderPath = "D:\\video\\chunks\\";
        //块文件目录对象
        File chunkFileFolder = new File(chunkFileFolderPath);
        //块文件列表
        File[] files = chunkFileFolder.listFiles();
        //将块文件排序，按名称升序
        List<File> fileList = Arrays.asList(files);
        Collections.sort(fileList, new Comparator<File>() {
            @Override
            public int compare(File o1, File o2) {
                if(Integer.parseInt(o1.getName())>Integer.parseInt(o2.getName())){
                    return 1;
                }
                return -1;

            }
        });

        //合并文件
        File mergeFile = new File("D:\\video\\lucene_merge.avi");
        //创建新文件
        boolean newFile = mergeFile.createNewFile();

        //创建写对象
        RandomAccessFile raf_write = new RandomAccessFile(mergeFile,"rw");

        byte[] b = new byte[1024];
        for(File chunkFile:fileList){
            //创建一个读块文件的对象
            RandomAccessFile raf_read = new RandomAccessFile(chunkFile,"r");
            int len = -1;
            while((len = raf_read.read(b))!=-1){
                raf_write.write(b,0,len);
            }
            raf_read.close();
        }
        raf_write.close();
    }

File Upload

   //得到块文件所属目录路径
    private String getChunkFileFolderPath(String fileMd5){
        return  upload_location + fileMd5.substring(0,1) + "/" + fileMd5.substring(1,2) + "/" + fileMd5 + "/chunk/";
    }
    /**
     * 文件上传前的注册，检查文件是否存在
     * 根据文件md5得到文件路径
     * 规则：
     * 一级目录：md5的第一个字符
     * 二级目录：md5的第二个字符
     * 三级目录：md5
     * 文件名：md5+文件扩展名
     * @param fileMd5 文件md5值
     * @param fileExt 文件扩展名
     * @return 文件路径
     */
    public ResponseResult register(String fileMd5, String fileName, Long fileSize, String mimetype, String fileExt) {

        //1  检查文件在磁盘上是否存在
        //文件所属目录的路径
        String fileFolderPath = this.getFileFolderPath(fileMd5);
        //文件的路径
        String filePath =this.getFilePath(fileMd5,fileExt);
        File file = new File(filePath);
        //文件是否存在
        boolean exists = file.exists();

        //2 检查文件信息在mongodb中是否存在
        Optional<MediaFile> optional = mediaFileRepository.findById(fileMd5);
        if(exists && optional.isPresent()){
            //文件存在
            ExceptionCast.cast(MediaCode.UPLOAD_FILE_REGISTER_EXIST);
        }
        //文件不存在时作一些准备工作，检查文件所在目录是否存在，如果不存在则创建
        File fileFolder = new File(fileFolderPath);
        if(!fileFolder.exists()){
            fileFolder.mkdirs();
        }

        return new ResponseResult(CommonCode.SUCCESS);
    }

Personal feeling behind a few episodes of the code is entirely cope with basically copy the code, did not see the meaning of words are written the basic path, does not make sense, it is recommended students need to take a good look at writing code

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This code behind file stream operation is quite difficult, it is recommended directly copy the code, this project really does not make sense! ! !