| CPC H04N 19/156 (2014.11) [H04L 65/70 (2022.05); H04N 19/513 (2014.11)] | 17 Claims |

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1. A method for video processing, comprising:
performing a conversion between a current video unit of a video and a bitstream of the video based on a constrained resource according to a rule;
wherein the rule specifies a combination of the following:
a same prediction mode for a plurality of samples within the current video unit,
a same merge candidate index for the plurality of samples within the current video unit, wherein the same merge candidate index comprises 0 or 1,
and
a temporal motion vector prediction for the plurality of samples within the current video unit being disabled, and
wherein the constrained resource comprises at least one of the following:
a bitrate being below a first predefined threshold,
an available memory resource being below a second predefined threshold, and
an encoding time length being below a third predefined threshold.
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