2020-04-08

语录

  1. Don’t look down, the crown will fall. Don’t cry, bitch will laugh.在这里插入图片描述
  2. No matter how long the road is, you can walk step by step. No matter how short the road is, you can’t get there without your feet.
本系统旨在构建一套面向高等院校的综合性教务管理平台,涵盖学生、教师及教务处三个核心角色的业务需求。系统设计着重于实现教学流程的规范化与数据处理的自动化,以提升日常教学管理工作的效率与准确性。 在面向学生的功能模块中,系统提供了课程选修服务,学生可依据培养方案选择相应课程,并生成个人专属的课表。成绩查询功能支持学生查阅个人各科目成绩,同时系统可自动计算并展示该课程的全班最高分、平均分、最低分以及学生在班级内的成绩排名。 教师端功能主要围绕课程与成绩管理展开。教师可发起课程设置申请,提交包括课程编码、课程名称、学分学时、课程概述在内的新课程信息,亦可对已开设课程的信息进行更新或撤销。在课程管理方面,教师具备录入所授课程期末考试成绩的权限,并可导出选修该课程的学生名单。 教务处作为管理中枢,拥有课程审批与教学统筹两大核心职能。课程设置审批模块负责处理教师提交的课程申请,管理员可根据教学计划与资源情况进行审核批复。教学安排模块则负责全局管控,包括管理所有学生的选课最终结果、生成包含学号、姓名、课程及成绩的正式成绩单,并能基于选课与成绩数据,统计各门课程的实际选课人数、最高分、最低分、平均分以及成绩合格的学生数量。 资源来源于网络分享,仅用于学习交流使用,请勿用于商业,如有侵权请联系我删除!
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#EXTINF:4.266667, #EXT-X-BYTERANGE:1056000@38053472 https://uattapocarezbr1.blob.core.windows.net/uat-tapo-care-zbr1/DEF/US/2025/11/13/17153011022050/2025-11-13.07-55-36.589.0ff0b115-cc66-42c8-a4b9-19a3f80c0855.2688-1520.0.19430.ts?sv=2020-04-08&spr=https&se=2025-11-14T11%3A34%3A28Z&skoid=ce02203e-e69a-4d68-978e-8d960a8e1f83&sktid=82e2caa8-bfdb-4e72-bb1b-2aded5d3c408&skt=2025-11-14T09%3A51%3A11Z&ske=2025-11-21T08%3A51%3A07Z&sks=b&skv=2020-04-08&sr=b&sp=r&sig=wEgPeVth%2FrMw7WZjF%2Bj1tjbv%2FAM%2F8YfcZOxmzkSoupw%3D #EXT-X-ENDLIST
11-18
你访问的URL返回的是HLS(HTTP Live Streaming)协议的M3U8播放列表文件,而不是直接的视频文件。这是现代流媒体服务的常见设计,目的是实现**分片传输**和**自适应码率**。以下是详细解释: --- ### **1. 为什么返回M3U8文件而非视频?** - **HLS协议的工作流程**: HLS会将视频分割成多个小分片(通常是`.ts`文件),并通过M3U8文件(文本格式的播放列表)描述分片的顺序、时长、加密信息等。浏览器或播放器根据M3U8文件逐步下载并拼接分片,实现流畅播放。 - **优点**: - 支持自适应码率切换(根据网络状况选择不同清晰度的分片)。 - 减少卡顿:分片可以并行下载和缓冲。 - 支持加密(如你示例中的AES-128加密)。 --- ### **2. M3U8文件解析** 你的M3U8文件包含以下关键字段: #### **基础信息** - `#EXTM3U`:文件头,表明这是HLS播放列表。 - `#EXT-X-VERSION:4`:HLS协议版本。 - `#EXT-X-TARGETDURATION:10`:每个分片的最大时长(秒)。 - `#EXT-X-PLAYLIST-TYPE:VOD`:表示点播视频(非直播)。 #### **分片信息** - `#EXTINF:9.950000`:分片时长(秒)。 - `#EXT-X-BYTERANGE:2024016@0`:分片在TS文件中的字节范围(`长度@起始偏移量`)。 - 分片URL示例: ``` https://uattapocarezbr1.blob.core.windows.net/.../2025-11-13.07-55-36.589...ts ``` - 同一个TS文件被多次引用,通过`BYTERANGE`指定不同区间(节省存储空间)。 #### **加密配置** - `#EXT-X-KEY:METHOD=AES-128`: - 分片使用AES-128加密。 - `URI`:密钥获取地址(需JWT认证)。 - `IV`:初始化向量(全零表示使用分片序列号作为IV)。 #### **结束标记** - `#EXT-X-ENDLIST`:表示点播视频结束(直播流没有此标记)。 --- ### **3. 播放器如何工作?** 1. **解析M3U8**:播放器读取播放列表,获取分片URL和加密信息。 2. **获取密钥**: - 向`URI`发送请求(需携带JWT),获取解密密钥。 3. **下载分片**:按顺序下载`.ts`文件(或指定字节范围)。 4. **解密并播放**: - 用密钥和IV解密分片。 - 通过浏览器的Media Source Extensions (MSE) API动态拼接分片,交给`<video>`标签播放。 --- ### **4. 为什么TS文件复用?** - 你的示例中,所有分片来自同一个TS文件(`19430.ts`),通过`BYTERANGE`指定不同片段。 - **优点**: - 减少小文件数量,降低存储和CDN开销。 - 适合长视频分段加载。 --- ### **5. 如何手动下载并播放?** 1. **下载M3U8文件**:保存为`playlist.m3u8`。 2. **下载密钥**: ```bash curl "https://use1-web-tapo-care-beta.tplinknbu.com/v1/secret-keys/video?jwsToken=eyJraWQiOi..." > key.key ``` 3. **下载分片**:用工具(如`ffmpeg`)合并: ```bash ffmpeg -i playlist.m3u8 -c copy output.mp4 ``` ---
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