Resource constrained video encoding
Example implementations include a method for video processing, comprising performing a conversion between a current video unit of a video and a bitstream of the video according to a rule, wherein the rule specifies performing the conversion based on a predefined bitstream.
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.
2. The method of claim 1 , wherein the plurality of samples include all samples in the current video unit, or all inter-coded samples in the current video unit.
3. The method of claim 1 , wherein the prediction mode includes at least one of an inter prediction mode, a skip mode, or a merge mode.
4. The method of claim 1 , wherein the rule further specifies: restricting a plurality of coding units within the current video unit to a same size.
5. The method of claim 1 , wherein the rule further specifies: disabling a filtering method for the plurality of samples within the current video unit.
6. The method of claim 5 , wherein the filtering method includes at least one of the following: a deblocking filter, a sample adaptive offset (SAO), an adaptive loop filter (ALF), a cross-component adaptive loop filter (CC-ALF), a luma mapping with chroma scaling (LMCS).
7. The method of claim 1 , wherein in response to the current video unit being an inter video unit, the rule further specifies: using a zero motion vector for a plurality of regions of the current video unit.
8. The method of claim 7 , wherein all motion vectors in the current video unit point to one or more same reference pictures, and/or all coding units in the current video unit satisfy at least one of having no residue, having a deblocking disabled, having a sample adaptive offset disabled, having an adaptive loop filter disabled, having a cross-component adaptive loop filter disabled, having reference picture resampling disabled.
9. The method of claim 1 , wherein in response to the current video unit being an inter video unit, the rule further specifies: copying a collocated picture or a nearest picture for the current video unit.
10. The method of claim 1 , wherein the conversion includes encoding the current video unit into the bitstream.
11. The method of claim 1 , wherein the conversion includes decoding the current video unit from the bitstream.
12. 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:
perform 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.
13. A non-transitory computer-readable storage medium storing instructions that cause a processor to:
perform 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.
14. A non-transitory computer-readable recording medium storing computer executable program, when executed by a video processing apparatus, cause the video processing apparatus to perform a method comprising:
generating a bitstream of the video based on a current video unit of the video based on a constrained resource according to a rule by performing a conversion;
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.
15. The method of claim 10 , further comprising:
generating a predefined stream in response to the constrained resource based on at least one of the following: a fixed quantization parameter (QP), a resolution value, or a picture.
16. The method of claim 15 , wherein the fixed quantization parameter equals to K, and wherein K is an integer.
17. The method of claim 15 , wherein the predefined stream is used for a session which is defined as: one or more continuous tiles, one or more continuous slices, or one or more continuous pictures.