Constraints on quantized residual differential pulse code modulation representation of coded video

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, that a differential coding mode used for residual samples is applied to the current video block;
• and
• perform, based on the determining, the conversion using the differential coding mode,
• wherein, in the differential coding mode, differences between quantized residuals derived with an intra prediction and predictors of the quantized residuals are presented in the bitstream, and wherein at least one of reconstructed quantized residuals is derived based on a sum of one difference and another reconstructed quantized residual, and
• wherein values of the reconstructed quantized residuals are restricted within a specific range by a clipping operation applied to the reconstructed quantized residuals.

A non-transitory computer readable media 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, that a differential coding mode used for residual samples is applied to the current video block;
• and
• perform, based on the determining, the conversion using the differential coding mode,
• wherein, in the differential coding mode, differences between quantized residuals derived with an intra prediction and predictors of the quantized residuals are presented in the bitstream, and wherein at least one of reconstructed quantized residuals is derived based on a sum of one difference and another reconstructed quantized residual, and
• wherein values of the reconstructed quantized residuals are restricted within a specific range by a clipping operation applied to the reconstructed quantized residuals.

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

• determining that a differential coding mode used for residual samples is applied to a current video block of the video;
• and
• generating the bitstream of the video based on the determining using the differential coding mode,
• wherein, in the differential coding mode, differences between quantized residuals derived with an intra prediction and predictors of the quantized residuals are presented in the bitstream, and wherein at least one of reconstructed quantized residuals is derived based on a sum of one difference and another reconstructed quantized residual, and
• wherein values of the reconstructed quantized residuals are restricted within a specific range by applying a clipping operation to the reconstructed quantized residuals.