Interactions between in-loop reshaping and inter coding tools

An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

• determine, for a conversion between a current video block of a video and a bitstream of the video, a first prediction block in a first domain from at least one reference picture using an unrefined motion information, wherein the current video block is a luma block;
• apply, at least based on the first prediction block, a motion information refinement process on the unrefined motion information to obtain a motion offset information;
• generate a second prediction block from samples in the at least one reference picture using the motion offset information;
• convert, based on a forward mapping process, the second prediction block from the first domain to the second domain in which samples of the second prediction block are mapped into particular values;
• and
• generate reconstructed samples of the current video block based on the second prediction block in the second domain.

A non-transitory computer-readable storage medium storing instructions that cause a processor to:

• determine, for a conversion between a current video block of a video and a bitstream of the video, a first prediction block in a first domain from at least one reference picture using an unrefined motion information, wherein the current video block is a luma block;
• apply, at least based on the first prediction block, a motion information refinement process on the unrefined motion information to obtain a motion offset information;
• generate a second prediction block from samples in the at least one reference picture using the motion offset information;
• convert, based on a forward mapping process, the second prediction block from the first domain to the second domain in which samples of the second prediction block are mapped into particular values;
• and
• generate reconstructed samples of the current video block based on the second prediction block in the second domain.

A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:

• determining, for a current video block of a video, a first prediction block in a first domain from at least one reference picture using an unrefined motion information, wherein the current video block is a luma block;
• applying, at least based on the first prediction block, a motion information refinement process on the unrefined motion information to obtain a motion offset information;
• generating a second prediction block from samples in the at least one reference picture using the motion offset information;
• converting, based on a forward mapping process, the second prediction block from the first domain to the second domain in which samples of the second prediction block are mapped into particular values;
• generating the bitstream based on the second prediction block in the second domain;
• wherein reconstructed samples of the current video block are generated based on the second prediction block in the second domain.