What is FFmpeg? What are its core components and common commands?

FFmpeg is an open-source cross-platform multimedia processing framework primarily used for recording, converting, and streaming audio and video.

Core Components

FFmpeg consists of the following main libraries:

1. libavformat: Handles various audio/video container formats
2. libavcodec: Contains various audio/video codecs
3. libavutil: Provides common utility functions
4. libswscale: Used for image scaling and color space conversion
5. libswresample: Used for audio resampling

Common Commands

bash
# Video format conversion
ffmpeg -i input.mp4 output.avi

# Extract audio
ffmpeg -i video.mp4 -vn -acodec copy audio.aac

# Video screenshot
ffmpeg -i video.mp4 -ss 00:00:05 -vframes 1 screenshot.jpg

# Video clipping
ffmpeg -i input.mp4 -ss 00:00:10 -t 00:00:30 -c copy output.mp4

Application Scenarios

• Video transcoding and format conversion
• Video editing and processing
• Audio extraction and processing
• Video streaming
• Video compression and optimization

FFmpeg is widely used in various multimedia processing scenarios due to its powerful features and cross-platform capabilities.