Calyp is an open-source raw video player for image/video analysis
use FFmpeg's AVFilter to add watermark in a video file
The simplest video player based on FFmpeg
The simplest video encoder based on FFmpeg
The simplest audio player based on FFmpeg
FFvid Codec Pack
Yet Another Video Open source framework
FFmpeg-based decoded component for Apple QuickTime
Audio/Video codec library with permissive license