123 source: Term used to describe the video material or some of its attributes before encoding.
123 source: Term used to describe the video material or some of its attributes before encoding.
源：用来描述视频素材或其编码前属性的术语。
123 source: Term used to describe the video material or some of its attributes before encoding.
源：用来描述视频素材或其编码前属性的术语。