Kronos

Kronos: retimes a clip with motion vectors, as Nuke's Kronos. Timing: Output Speed, Input Speed or an animated Frame curve. Method: Frame (nearest), Blend, Motion (the input's motion / occlusion layers, else AI optical flow) or RIFE 4.26 (AI worker, ours). Shutter samples / time add motion blur. All layers are retimed; float values and highlights are kept. Generating flow never freezes the app: the frame shows when the vectors are ready.

Node	Kronos
Type id	`OC_N_retime`
Menu	Time › Kronos
Nuke class	`Kronos`
Code	`opencomp_core/nodes/ai/aimotion.py`

Kronos properties

Inputs and outputs

Port	Name	Type
input 0	Source	image
output 0	Image	image

Knobs

Panel tab Kronos, in panel order.

Knob	Label	Type	Default	Range / values	Nuke knob	Description
`input_first`	Input Range	float	`1`	-100000 to 100000 (integer)
`input_last`	to	float	`100`	-100000 to 100000 (integer)
`reset_input_range`	Reset	button (panel only)
`use_input_range`	input range from source	bool	`true`			Input first/last and output first = the upstream clip's frame range
`output_first`	output first	float	`1`	-100000 to 100000 (integer)		Output frame of the input's first frame (Nuke: the input first)
`channels`	Channels	menu	`all`	all, rgba	`retimedChannels`
`method`	Method	menu	`motion`	nearest (Frame), blend (Blend), motion (Motion), rife (RIFE)	`interpolation`
`timing`	Timing	menu	`speed`	speed (Output Speed), input_speed (Input Speed), frame (Frame)	`timing2`
`speed`	Output Speed	float	`0.5`	-4 to 4	`timingOutputSpeed`
`input_speed`	Input Speed	float	`0.5`	0.001 to 4	`timingInputSpeed`
`source_frame`	Frame	float	`1`	-100000 to 100000	`timingFrame2`
`motion_estimation`	Motion	menu	`Regularized`	Regularized, Local	`motionEstimation`
`flow_model`	flow model	menu	`AUTO`	AUTO (Auto (by free GPU memory)), sea-raft-m (SEA-RAFT M), sea-raft-s (SEA-RAFT S)
`use_input_vectors`	use input vectors	bool	`true`			Use the input's motion / occlusion layers when present (else run AI flow)
`vector_detail`	Vector Detail	float	`0.3`	0.01 to 1	`vectorDetail`
`strength`	Strength	float	`1.5`	0 to 5	`strength`
`smoothness`	Smoothness	float	`0.5`	0 to 1	`smoothness`
`resample_type`	Resampling	menu	`Bilinear`	Bilinear, Lanczos4, Lanczos6	`resampleType`
`shutter_samples`	Shutter Samples	float	`1`	1 to 64 (integer)	`shutterSamples`
`shutter_time`	Shutter Time	float	`0`	0 to 2	`shutterTime`
`auto_shutter_time`	Automatic Shutter Time	bool	`false`		`autoShutterTime`
`output`	Output	menu	`Result`	Result, Matte, Foreground, Background	`output`
`matte_channel`	Matte Channel	menu	`None`	None, Source Alpha, Source Inverted Alpha, Matte Luminance, Matte Inverted Luminance, Matte Alpha, Matte Inverted Alpha	`matteChannel`
`flicker_compensation`	Flicker Compensation	bool	`false`		`flickerCompensation`
`weight_red`	Weight Red	float	`0.3`	0 to 1	`weightRed`
`weight_green`	Weight Green	float	`0.6`	0 to 1	`weightGreen`
`weight_blue`	Weight Blue	float	`0.1`	0 to 1	`weightBlue`
`vector_spacing`	Vector Spacing	float	`20`	1 to 100 (integer)	`vectorSpacing`
`show_vectors`	Overlay Vectors	bool	`false`		`showVectors`

Other knobs (Python, .nk and the assistant; not on the panel)

Knob	Label	Type	Default	Range / values
`gl_color`	Viewer Controls Color	float ×3	`0, 0, 0`	0 to 1
`postage_stamp_frame`	Static Frame	int	`1`	-2147483648 to 2147483647
`lifetimeStart`	Lifetime Start	int	`0`	-2147483648 to 2147483647
`lifetimeEnd`	Lifetime End	int	`100`	-2147483648 to 2147483647
`useLifetime`	Use Lifetime	boolean	`false`
`cached`	Cached	boolean	`false`
`bookmark`	Bookmark	boolean	`false`
`dope_sheet`	Dope Sheet	boolean	`false`
`clone_group`	Clone Group	string
`link_source`	Link Source	string
`link_overrides`	Link Overrides	string
`split_views`	Split Views	string

Nuke equivalent

Imports from and exports to Nuke's Kronos.

Knobs with a different name here:

Nuke knob	Knob here
`retimedChannels`	`channels`
`interpolation`	`method`
`timing2`	`timing`
`timingOutputSpeed`	`speed`
`timingInputSpeed`	`input_speed`
`timingFrame2`	`source_frame`
`motionEstimation`	`motion_estimation`
`vectorDetail`	`vector_detail`
`resampleType`	`resample_type`
`shutterSamples`	`shutter_samples`
`shutterTime`	`shutter_time`
`autoShutterTime`	`auto_shutter_time`
`matteChannel`	`matte_channel`
`flickerCompensation`	`flicker_compensation`
`weightRed`	`weight_red`
`weightGreen`	`weight_green`
`weightBlue`	`weight_blue`
`vectorSpacing`	`vector_spacing`
`showVectors`	`show_vectors`

Nuke knobs not in this list import as a knob of the same name, or are kept unchanged for export. See .nk import.

Examples

Open these from Help › Examples…, or from the ? menu in this node's Properties panel.

Retime: half speed with frame blending (examples/time/retime_blend.oink): Retime at speed 0.5 turns the 8-frame Beachball move into 16 frames; "blend" mixes the two nearest source frames (use "motion" for vector-based in-betweens).

Inputs and outputsCopy Anchor Link

KnobsCopy Anchor Link

Other knobs (Python, .nk and the assistant; not on the panel)Copy Anchor Link

Nuke equivalentCopy Anchor Link

ExamplesCopy Anchor Link

On this page

Inputs and outputs

Knobs

Other knobs (Python, .nk and the assistant; not on the panel)

Nuke equivalent

Examples