diff --git a/src/__tests__/tally.spec.ts b/src/__tests__/tally.spec.ts
index e4288b98b..975cd14e0 100644
--- a/src/__tests__/tally.spec.ts
+++ b/src/__tests__/tally.spec.ts
@@ -29,6 +29,22 @@ function loadRawState(file: string): AtemState {
 		videoState.mixEffects = videoState.ME
 	}
 
+	loadedState.video.mixEffects.forEach(me => {
+		// Lazy fix up moving some state properties
+		if (me) {
+			const me1 = me as any
+			if (typeof me.transitionPosition === 'number') {
+				me.transitionPosition = {
+					inTransition: me1.inTransition,
+					handlePosition: me1.transitionPosition,
+					remainingFrames: me1.transitionFramesLeft
+				}
+				delete me1.transitionFramesLeft
+				delete me1.inTransition
+			}
+		}
+	})
+
 	return loadedState
 }
 function loadTally(file: string): { program: number[]; preview: number[] } {
diff --git a/src/commands/MixEffects/Transition/TransitionPositionCommand.ts b/src/commands/MixEffects/Transition/TransitionPositionCommand.ts
index 3699159f7..b3e609b18 100644
--- a/src/commands/MixEffects/Transition/TransitionPositionCommand.ts
+++ b/src/commands/MixEffects/Transition/TransitionPositionCommand.ts
@@ -1,11 +1,8 @@
 import { BasicWritableCommand, DeserializedCommand } from '../../CommandBase'
 import { AtemState, AtemStateUtil, InvalidIdError } from '../../../state'
+import { TransitionPosition } from '../../../state/video'
 
-export interface HandlePositionProps {
-	handlePosition: number // 0...10000
-}
-
-export class TransitionPositionCommand extends BasicWritableCommand<HandlePositionProps> {
+export class TransitionPositionCommand extends BasicWritableCommand<Pick<TransitionPosition, 'handlePosition'>> {
 	public static readonly rawName = 'CTPs'
 
 	public readonly mixEffect: number
@@ -24,17 +21,12 @@ export class TransitionPositionCommand extends BasicWritableCommand<HandlePositi
 	}
 }
 
-export interface TransitionPositionProps extends HandlePositionProps {
-	inTransition: boolean
-	remainingFrames: number // 0...250
-}
-
-export class TransitionPositionUpdateCommand extends DeserializedCommand<TransitionPositionProps> {
+export class TransitionPositionUpdateCommand extends DeserializedCommand<TransitionPosition> {
 	public static readonly rawName = 'TrPs'
 
 	public readonly mixEffect: number
 
-	constructor(mixEffect: number, properties: TransitionPositionProps) {
+	constructor(mixEffect: number, properties: TransitionPosition) {
 		super(properties)
 
 		this.mixEffect = mixEffect
@@ -57,9 +49,7 @@ export class TransitionPositionUpdateCommand extends DeserializedCommand<Transit
 		}
 
 		const mixEffect = AtemStateUtil.getMixEffect(state, this.mixEffect)
-		mixEffect.transitionFramesLeft = this.properties.remainingFrames
-		mixEffect.transitionPosition = this.properties.handlePosition
-		mixEffect.inTransition = this.properties.inTransition
-		return `video.ME.${this.mixEffect}.transition`
+		mixEffect.transitionPosition = this.properties
+		return `video.ME.${this.mixEffect}.transitionPosition`
 	}
 }
diff --git a/src/lib/tally.ts b/src/lib/tally.ts
index 995fab1a5..37a8714a1 100644
--- a/src/lib/tally.ts
+++ b/src/lib/tally.ts
@@ -25,7 +25,7 @@ function _calcActiveMeInputs(inputs: Set<number>, mode: 'program' | 'preview', s
 				const keyerMask = 1 << (usk.upstreamKeyerId + 1)
 				const isPartOfTransition = meRef.transitionProperties.selection & keyerMask
 				if (mode === 'program') {
-					if (meRef.inTransition) {
+					if (meRef.transitionPosition.inTransition) {
 						return usk.onAir || isPartOfTransition
 					}
 
@@ -77,8 +77,9 @@ function _calcActiveMeInputs(inputs: Set<number>, mode: 'program' | 'preview', s
 	}
 
 	// Compute what sources are currently participating in a transition.
-	const isTransitionInProgram = mode === 'program' && meRef.inTransition
-	const isTransitionInPreview = mode === 'preview' && meRef.transitionPreview && meRef.transitionPosition > 0
+	const isTransitionInProgram = mode === 'program' && meRef.transitionPosition.inTransition
+	const isTransitionInPreview =
+		mode === 'preview' && meRef.transitionPreview && meRef.transitionPosition.handlePosition > 0
 	if (isTransitionInProgram || isTransitionInPreview) {
 		if (meRef.transitionProperties.selection & 1) {
 			// Includes background
diff --git a/src/state/util.ts b/src/state/util.ts
index c6c0f65a5..07527553a 100644
--- a/src/state/util.ts
+++ b/src/state/util.ts
@@ -99,10 +99,12 @@ export function getMixEffect(state: AtemState, index: number, dontCreate?: boole
 			index,
 			programInput: 0,
 			previewInput: 0,
-			inTransition: false,
 			transitionPreview: false,
-			transitionPosition: 0,
-			transitionFramesLeft: 0,
+			transitionPosition: {
+				inTransition: false,
+				handlePosition: 0,
+				remainingFrames: 0
+			},
 			transitionProperties: {
 				style: Enums.TransitionStyle.MIX,
 				selection: 1,
diff --git a/src/state/video/index.ts b/src/state/video/index.ts
index 05f89b93e..29886bd5d 100644
--- a/src/state/video/index.ts
+++ b/src/state/video/index.ts
@@ -72,15 +72,19 @@ export interface TransitionSettings {
 	wipe?: WipeTransitionSettings
 }
 
+export interface TransitionPosition {
+	inTransition: boolean
+	handlePosition: number
+	remainingFrames: number
+}
+
 export interface MixEffect {
 	readonly index: number
 	programInput: number
 	previewInput: number
-	inTransition: boolean
 	transitionPreview: boolean
-	transitionPosition: number
-	transitionFramesLeft: number
 	fadeToBlack?: FadeToBlackProperties
+	transitionPosition: TransitionPosition
 	transitionProperties: TransitionProperties
 	transitionSettings: TransitionSettings
 	readonly upstreamKeyers: Array<USK.UpstreamKeyer | undefined>