How to Create a Resumable Video Uploader in Node.js

This tutorial shows how to create a resumable video uploader with thumbnail generation. The process involves using Node.js, Socket.io, and the FileReader API for client-server communication and file handling. Let's break down the steps:

Introduction

A resumable uploader requires the server to track upload progress and resume from interruptions. This is achieved by giving the Node.js server control over data requests, with the HTML form responding to these requests. Socket.io facilitates real-time communication between the server and the client.

1. HTML Form Creation

A simple HTML form is created with a file input, a name field, and an upload button. The form elements are wrapped in a div for easier JavaScript manipulation. (Image of the form is included here).

2. Adding Upload Functionality with the FileReader API

JavaScript event listeners are attached to the upload button and file input. The FileReader API is used to read file chunks and send them to the server. The StartUpload function initiates the upload process.

3. Building the Socket.io Server (Node.js)

The Node.js server uses Socket.io to handle communication. The server manages file uploads, tracking progress and resuming interrupted uploads. The server receives data in chunks (524288 bytes), stores temporary files, and handles the final file writing and thumbnail generation.

The server-side code includes:

• A Start event handler to initialize a new upload or resume an existing one.
• An Upload event handler to receive and process data chunks. This handler manages a data buffer, writes data to a temporary file, and emits MoreData events to request further chunks.
• A Done event handler to finalize the upload, generate a thumbnail using ffmpeg, and delete the temporary file. (Note: ffmpeg integration is not explicitly detailed here, but assumed).

4. Client-Side (JavaScript) Handling of Server Events

The client-side JavaScript handles the MoreData event by reading and sending the requested data chunk to the server. The webkitSlice method is used for efficient chunking.

5. Finalizing the Upload and Thumbnail Generation

The server uses fs.createReadStream and fs.createWriteStream along with the util.pump function to efficiently move the temporary file to the final destination. The thumbnail generation (using ffmpeg) is triggered after the file upload is complete. The Done event updates the UI with a success message and the generated thumbnail.

Conclusion

This approach creates a robust and efficient resumable video uploader. Further enhancements could include database integration for persistent upload tracking and the use of a dedicated HTML5 video player for playback.

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