SEI messages in video coding

The present disclosure provides a method, an apparatus, and a non-transitory computer readable medium for processing video data. According to certain disclosed embodiments, a method for determining a target in a picture comprises: decoding a message from a bitstream, comprising: decoding a first list of tags; and decoding a first index of a first tag associated with the target to the first tag list; and determining the target based on the message. 本公开提供了用于处理视频数据的方法、装置和非暂时性的计算机可读介质。根据某些公开的实施例，一种用于确定图片中的目标的方法包括：从比特流解码消息，包括：解码第一标签列表；以及将与所述目标相关联的第一标签的第一索引解码到所述第一标签列表；以及基于所述消息确定所述目标。