How to write the video management function of CMS system in Python

How to use Python to write the video management function of a CMS system

Introduction:
In today’s digital age, video has become a very important form of media. Various websites require video management functions so that they can easily upload, store, play and manage video content. This article will teach you how to use Python to write video management functions in a CMS system.

1. Preparation:
Before we start writing, we need to install some necessary Python libraries. These libraries will help us process video files, connect to databases, and implement other corresponding functions.

1. Install the Flask library:
   Flask is a lightweight Python web framework that can be used to build simple and easy-to-use websites.
   Run the following command in the command line to install the Flask library:

   pip install flask

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2. Install the SQLAlchemy library:
   SQLAlchemy is a very powerful database tool in Python, which can flexibly Connect to and operate various types of databases.
   Run the following command in the command line to install the SQLAlchemy library:

   pip install sqlalchemy

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3. Install the Flask-Uploads library:
   Flask-Uploads is a convenient library that can help us Implement file upload function.
   Run the following command in the command line to install the Flask-Uploads library:

   pip install flask-uploads

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4. Install FFmpeg:
   FFmpeg is an open source audio and video processing tool, we can use it to extract Video thumbnails, transcoding videos, and more.
   Please install the corresponding version of FFmpeg according to the operating system you are using.

2. Create a Flask application:
Before we start writing code, we need to create a Flask application and make the necessary configurations.
First, create a file called app.py and enter the following content in it:

from flask import Flask

app = Flask(__name__)
app.config['UPLOADS_DEFAULT_DEST'] = 'path/to/uploads/directory'  # 指定上传文件保存的目录

if __name__ == '__main__':
    app.run()

Please replace 'path/to/uploads/directory' with what you want Directory to save uploaded files.

3. Write the video upload function:
Next, we start to write the video upload function.

1. First, add the following code to the app.py file:

   from flask_uploads import UploadSet, configure_uploads, VIDEO
   
   # 创建一个名为videos的上传集合，用于存储视频文件
   videos = UploadSet('videos', extensions=VIDEO)
   
   # 将上传集合与Flask应用进行关联
   configure_uploads(app, videos)

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2. Add video upload route.
   In the app.py file, add the following code:

   from flask import request
   
   @app.route('/upload', methods=['GET', 'POST'])
   def upload():
    if request.method == 'POST' and 'video' in request.files:
        filename = videos.save(request.files['video'])
        return f'{filename} 上传成功'
    return '''
    <form method="POST" enctype="multipart/form-data">
        <input type="file" name="video">
        <input type="submit" value="上传">
    </form>
    '''

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   This code defines a route named /upload. When the user uploads a video via POST, videos.save( will be called. ) method to save video files. If the upload is successful, a success message will be returned. If the user accesses the /upload route via GET, a simple file upload form will be displayed.

4. Write video management function:

1. Create a database model named Video.
   In the app.py file, add the following code:

   from sqlalchemy import Column, Integer, String
   from sqlalchemy.ext.declarative import declarative_base
   
   Base = declarative_base()
   
   class Video(Base):
    __tablename__ = 'videos'
    id = Column(Integer, primary_key=True)
    name = Column(String(255))

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   This code creates a database model named Video to represent video objects. It contains an auto-incremented id field and a name field to store the name of the video.

2. Create a database table and add videos to the database.
   In the app.py file, add the following code:

   from sqlalchemy import create_engine
   from sqlalchemy.orm import sessionmaker
   
   engine = create_engine('sqlite:///videos.db')
   Base.metadata.create_all(engine)
   Session = sessionmaker(bind=engine)
   session = Session()
   
   @app.route('/add_video', methods=['GET', 'POST'])
   def add_video():
    if request.method == 'POST' and 'video' in request.files:
        filename = videos.save(request.files['video'])
        video = Video(name=filename)
        session.add(video)
        session.commit()
        return f'{filename} 上传成功并保存到数据库'
    return '''
    <form method="POST" enctype="multipart/form-data">
        <input type="file" name="video">
        <input type="submit" value="上传">
    </form>
    '''

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   This code first creates a SQLite database named videos.db and creates the corresponding table using the Video model. Then, in the /add_video route, when the user uploads the video via POST, the video will be saved to the database.

5. Write the video playback function:

1. Create a video playback route.
   In the app.py file, add the following code:

   @app.route('/videos')
   def video_list():
    videos = session.query(Video).all()
    return '''
    <ul>
        {% for video in videos %}
        <li>
            <a href="{{ url_for('video_detail', video_id=video.id) }}">{{ video.name }}</a>
        </li>
        {% endfor %}
    </ul>
    '''
   
   @app.route('/videos/<int:video_id>')
   def video_detail(video_id):
    video = session.query(Video).get(video_id)
    return f'''
    <h1>{video.name}</h1>
    <video src="{{ url_for('static', filename='videos/' + video.name) }}" controls></video>
    '''

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   This code creates a route named /videos to display a list of all videos. When a user clicks on a video, the video's details page will open. In the details page, use the <video> tag to play the video, and fill the <h1> tag with the name of the video.

2. Define static file routing.
   In the app.py file, add the following code:

   from flask import send_from_directory
   
   @app.route('/static/videos/<path:filename>')
   def download_file(filename):
    return send_from_directory(app.config['UPLOADED_VIDEOS_DEST'], filename)

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   This code defines a route named /download for serving requests for video files. It will send the requested files to the user from the specified directory.

6. Run the application:
After completing the above code writing, you can run the following command in the command line to start the Flask application:

python app.py

Then, you You can access your CMS system by visiting http://localhost:5000 and test the video management function.

Conclusion:
Through the introduction of this article, we have learned how to use Python to write the video management function of the CMS system. It has functions such as video uploading, saving to database, video playback, etc. I hope this will be helpful to your future project development!

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