Pafy

Pafy also comes packed with ytdl, a Python CLI tool, which allows developers to fetch videos via the Python console as well.

The library has no external dependencies, which means it can easily be integrated with more powerful applications as well.

Features:

• Download videos
• Choose video quality for download
• Download all video quality versions
• Fetch video metadata
• Get view counts
• Get durations
• Get ratings
• Get author name
• Get thumbnail images
• Get video keywords
• Get video download URL
• Support for restricted videos

What is new in this release:

• Updates:
• Cache JavaScript file locally to temp dir (less fetching)
• Added itag 278 (low-res VP9)
• New Features:
• Retrieve DASH streams (more streams, higher quality audio)
• Added remux_audio parameter to download function to remux audio files if ffmpeg or avconv is installed (better compatibility)

What is new in version 0.3.60:

• Added Opus audio itags
• Warn instead of fail on unrecognized itags

What is new in version 0.3.54:

• Fixed issues with Windows file names.

What is new in version 0.3.46:

• Bugfix:
• Fixed truncated rawbitrate stream property
• Uses Unicode literals in ytdl