Besides, 1. it provides a way can compose different audio/video component. For instance, video decode -> post-video decode filter -> video mix -> pre-encode fil

Besides, 1. it provides a way can compose different audio/video component. For instance, video decode -> post-video decode filter -> video mix -> pre-encode fileter -> video encoder -> muxer. 2. can easily write new plugins, for example a dehaze plugin, which in turn can compose with other existing components (dehaze example shipped with project)