Efficient signaling for temporal interpolated prediction

A method of video encoding performed at a computing system having memory and one or more processors, the method comprising:

• receiving video data comprising a plurality of frames, including a current frame to be encoded in a temporal interpolated predicted (TIP) mode;
• when the current frame has a non-zero motion vector:
• signaling an indicator in a video bitstream, the indicator indicating that an adaptive motion vector difference (AMVD) mode is enabled for the current frame;
• and
• encoding the current frame using the TIP mode and the AMVD mode;
• and
• when the current frame does not have the non-zero motion vector, encoding the current frame using the TIP mode without the AMVD mode and without signaling the indicator.

A non-transitory computer-readable storage medium storing a video bitstream that is generated by a video encoding method, the video bitstream comprising:

• coded information for a plurality of frames including a current frame encoded in a temporal interpolated predicted (TIP) mode;
• and
• when the current frame has a non-zero motion vector, an indicator indicating that an adaptive motion vector difference (AMVD) mode is enabled for the current frame;
• wherein the video encoding method comprises:
• when the current frame has a non-zero motion vector:
• signaling the indicator in a video bitstream;
• and
• encoding the current frame using the TIP mode and the AMVD mode;
• and
• when the current frame does not have the non-zero motion vector, encoding the current frame using the TIP mode without the AMVD mode and without signaling the indicator.