Video encoding or decoding methods and apparatuses related to high-level information signaling

An apparatus of processing video data in a video encoding or decoding system, the apparatus comprising one or more electronic circuits configured for:

• receiving input video data of video pictures referring to a high-level syntax set;
• determining a first syntax element signaled or to be signaled in the high-level syntax set indicating whether reference picture resampling is disabled or constrained for the video pictures associated with the high-level syntax set;
• determining a second syntax element indicating whether subpicture partitioning is disabled or constrained for the video pictures associated with the high-level syntax set, wherein the first syntax element and the second syntax element are restricted to disable or constrain subpicture partitioning when reference picture resampling is enabled;
• and
• encoding or decoding the video pictures by allowing pictures with different resolutions to be referenced in inter prediction when reference picture resampling is enabled or allowing pictures only with a same resolution to be referenced in inter prediction when reference picture resampling is disabled, and encoding or decoding the video pictures by dividing each picture into one or more subpictures when subpicture partitioning is enabled or by processing each picture without dividing into subpictures when subpicture partitioning is disabled.

A non-transitory computer readable medium storing program instruction causing a processing circuit of an apparatus to perform a video processing method for video data, and the method comprising:

• receiving input video data of video pictures referring to a high-level syntax set;
• determining a first syntax element signaled or to be signaled in the high-level syntax set indicating whether reference picture resampling is disabled or constrained for the video pictures associated with the high-level syntax set;
• determining a second syntax element indicating whether subpicture partitioning is disabled or constrained for the video pictures associated with the high-level syntax set, wherein the first syntax element and the second syntax element are restricted to disable or constrain subpicture partitioning when reference picture resampling is enabled;
• and
• encoding or decoding the video pictures by allowing pictures with different resolutions to be referenced in inter prediction when reference picture resampling is enabled or allowing pictures only with a same resolution to be referenced in inter prediction when reference picture resampling is disabled, and encoding or decoding the video pictures by dividing each picture into one or more subpictures when subpicture partitioning is enabled or by processing each picture without dividing into subpictures when subpicture partitioning is disabled.