Signaling in transform skip mode

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, during a conversion between a current video block in a video region of a video and a bitstream of the video, whether a differential coding mode is enabled or disabled for the current video block, wherein, in the differential coding mode, differences between quantized residuals derived with an intra prediction mode of the current video block and predictions of the quantized residuals are included in the bitstream;
• and
• perform the conversion based on the determining,
• wherein a first syntax element indicating whether a transform skip mode is applied to the current video block is conditionally included in the bitstream based on the determining, and wherein, in the transform skip mode, a transform is skipped for a prediction residual.

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

• determine, during a conversion between a current video block in a video region of a video and a bitstream of the video, whether a differential coding mode is enabled or disabled for the current video block, wherein, in the differential coding mode, differences between quantized residuals derived with an intra prediction mode of the current video block and predictions of the quantized residuals are included in the bitstream;
• and
• perform the conversion based on the determining,
• wherein a first syntax element indicating whether a transform skip mode is applied to the current video block is conditionally included in the bitstream based on the determining, and wherein, in the transform skip mode, a transform is skipped for a prediction residual.

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 whether a differential coding mode is enabled or disabled for a current video block in a video region of a video, wherein, in the differential coding mode, differences between quantized residuals derived with an intra prediction mode of the current video block and predictions of the quantized residuals are included in the bitstream;
• and
• generating the bitstream based on the determining,
• wherein a first syntax element indicating whether a transform skip mode is applied to the current video block is conditionally included in the bitstream based on the determining, and wherein, in the transform skip mode, a transform is skipped for a prediction residual.