📺 Bilibili Video Downloader

A Python tool to download videos from Bilibili (B站) with WBI signature authentication, multi-quality selection, and optional ffmpeg audio+video merging.

Bilibili Video Downloader downloads videos from Bilibili by BV URL. It implements the WBI signature algorithm for API authentication, picks the best available MP4 quality, and supports downloading with aria2 (fast) or pure-Python fallback, then optionally merges audio & video with ffmpeg.

📦 Files

File	Description
`bilibili_downloader.py`	Standard version — fill in your `sessdata` cookie manually
`bilibili_downloader_auto.py`	Auto version — edit the `sessdata` variable inside the script

Both files have identical features. The difference is only how the cookie is provided.

✨ Features

Feature	Description
🔑 WBI Signature	Implements Bilibili WBI signing algorithm for authenticated API calls
🎞️ Best MP4 Quality	Automatically picks the highest available MP4 stream
🧪 URL Test	Verifies content URL accessibility before download
⚡ aria2 Support	Uses aria2 for fast parallel downloads (if installed)
🐍 Pure-Python Fallback	If aria2 is unavailable, downloads directly via Python
🎬 ffmpeg Merge	Merges separate video + audio streams into one file
📄 Info Fetch	Retrieves video metadata (title, etc.) via BV URL

🚀 Quick Start

Prerequisites

Python 3.7+
requests library
Cookie (sessdata) — required for Bilibili access
Optional: aria2 (fast), ffmpeg (audio/video merge)

Install

pip install requests

Log in to Bilibili in your browser
Open DevTools → Application → Cookies → find sessdata
Paste it into the script:

bilibili_downloader.py (fill at runtime or edit variable):

sessdata = ""  # <-- paste your sessdata

bilibili_downloader_auto.py (edit variable directly):

sessdata = '填写你的Cookie'  # <-- replace with your sessdata

Run

python bilibili_downloader.py
# or
python bilibili_downloader_auto.py

Enter a Bilibili video BV URL when prompted (e.g. BV1xx411c7mD).

📁 Project Structure

Bilibili-Video-Downloader/
├── bilibili_downloader.py       # Standard version
├── bilibili_downloader_auto.py  # Auto version (cookie in script)
└── README.md                    # This document

📄 License

This project is licensed under the MIT License. See LICENSE for details.

⚠️ Disclaimer

This tool is for personal learning and research only. Please respect Bilibili's Terms of Service and content creators' copyright. Do not redistribute downloaded content. Use at your own risk.

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