add annotation offset slider

web/src/components/overlay/ObjectTrackOverlay.tsx

@@ -37,8 +37,7 @@ export default function ObjectTrackOverlay({
   const { data: config } = useSWR<FrigateConfig>("config");
   const { annotationOffset } = useActivityStream();
 
-  // Offset currentTime by annotation offset for rendering
-  const effectiveCurrentTime = currentTime - annotationOffset;
+  const effectiveCurrentTime = currentTime - annotationOffset / 1000;
 
   // Fetch the full event data to get saved path points
   const { data: eventData } = useSWR(["event_ids", { ids: selectedObjectId }]);
@@ -157,8 +156,9 @@ export default function ObjectTrackOverlay({
   }, [savedPathPoints, eventSequencePoints, config, camera, currentTime]);
 
   // get absolute positions on the svg canvas for each point
-  const getAbsolutePositions = useCallback(() => {
+  const absolutePositions = useMemo(() => {
     if (!pathPoints) return [];
+
     return pathPoints.map((point) => {
       // Find the corresponding timeline entry for this point
       const timelineEntry = objectTimeline?.find(
@@ -272,11 +272,6 @@ export default function ObjectTrackOverlay({
       : [255, 0, 0];
   }, [pathPoints, getObjectColor]);
 
-  const absolutePositions = useMemo(
-    () => getAbsolutePositions(),
-    [getAbsolutePositions],
-  );
-
   // render any zones for object at current time
   const zonePolygons = useMemo(() => {
     return zones.map((zone) => {

web/src/components/overlay/detail/AnnotationOffsetSlider.tsx

@@ -0,0 +1,95 @@
+import { useCallback, useState } from "react";
+import { Slider } from "@/components/ui/slider";
+import { Button } from "@/components/ui/button";
+import { useActivityStream } from "@/contexts/ActivityStreamContext";
+import axios from "axios";
+import { useSWRConfig } from "swr";
+import { toast } from "sonner";
+import { useTranslation } from "react-i18next";
+
+type Props = {
+  className?: string;
+};
+
+export default function AnnotationOffsetSlider({ className }: Props) {
+  const { annotationOffset, setAnnotationOffset, camera } = useActivityStream();
+  const { mutate } = useSWRConfig();
+  const { t } = useTranslation(["views/explore"]);
+  const [isSaving, setIsSaving] = useState(false);
+
+  const handleChange = useCallback(
+    (values: number[]) => {
+      if (!values || values.length === 0) return;
+      const valueMs = values[0];
+      setAnnotationOffset(valueMs);
+    },
+    [setAnnotationOffset],
+  );
+
+  const reset = useCallback(() => {
+    setAnnotationOffset(0);
+  }, [setAnnotationOffset]);
+
+  const save = useCallback(async () => {
+    setIsSaving(true);
+    try {
+      // save value in milliseconds to config
+      await axios.put(
+        `config/set?cameras.${camera}.detect.annotation_offset=${annotationOffset}`,
+        { requires_restart: 0 },
+      );
+
+      toast.success(
+        t("objectLifecycle.annotationSettings.offset.toast.success", {
+          camera,
+        }),
+        { position: "top-center" },
+      );
+
+      // refresh config
+      await mutate("config");
+    } catch (e: unknown) {
+      const err = e as {
+        response?: { data?: { message?: string } };
+        message?: string;
+      };
+      const errorMessage =
+        err?.response?.data?.message || err?.message || "Unknown error";
+      toast.error(t("toast.save.error.title", { errorMessage, ns: "common" }), {
+        position: "top-center",
+      });
+    } finally {
+      setIsSaving(false);
+    }
+  }, [annotationOffset, camera, mutate, t]);
+
+  return (
+    <div
+      className={`absolute bottom-0 left-0 right-0 z-30 flex items-center gap-3 bg-gradient-to-t from-secondary/90 to-transparent p-3 ${className ?? ""}`}
+      style={{ pointerEvents: "auto" }}
+    >
+      <div className="w-56 text-sm">
+        Annotation offset (ms): {annotationOffset}
+      </div>
+      <div className="flex-1">
+        <Slider
+          value={[annotationOffset]}
+          min={-1500}
+          max={1500}
+          step={50}
+          onValueChange={handleChange}
+        />
+      </div>
+      <div className="flex items-center gap-2">
+        <Button size="sm" variant="ghost" onClick={reset}>
+          Reset
+        </Button>
+        <Button size="sm" onClick={save} disabled={isSaving}>
+          {isSaving
+            ? t("button.saving", { ns: "common" })
+            : t("button.save", { ns: "common" })}
+        </Button>
+      </div>
+    </div>
+  );
+}

web/src/components/overlay/detail/AnnotationSettingsPane.tsx

@@ -174,7 +174,7 @@ export function AnnotationSettingsPane({
                   {t("objectLifecycle.annotationSettings.offset.label")}
                 </FormLabel>
                 <div className="flex flex-col gap-3 md:flex-row-reverse md:gap-8">
-                  <div className="flex flex-row items-center gap-3 rounded-lg bg-destructive/50 p-3 text-sm text-primary-variant md:my-0 md:my-5">
+                  <div className="flex flex-row items-center gap-3 rounded-lg bg-destructive/50 p-3 text-sm text-primary-variant md:my-5">
                     <PiWarningCircle className="size-24" />
                     <div>
                       <Trans ns="views/explore">

web/src/components/timeline/ActivityStream.tsx

@@ -7,6 +7,7 @@ import scrollIntoView from "scroll-into-view-if-needed";
 import useUserInteraction from "@/hooks/use-user-interaction";
 import { formatUnixTimestampToDateTime } from "@/utils/dateUtil";
 import { useTranslation } from "react-i18next";
+import AnnotationOffsetSlider from "@/components/overlay/detail/AnnotationOffsetSlider";
 import { FrigateConfig } from "@/types/frigateConfig";
 import useSWR from "swr";
 import ActivityIndicator from "../indicators/activity-indicator";
@@ -27,7 +28,7 @@ export default function ActivityStream({
   const { selectedObjectId, annotationOffset } = useActivityStream();
   const scrollRef = useRef<HTMLDivElement>(null);
 
-  const effectiveTime = currentTime + annotationOffset;
+  const effectiveTime = currentTime + annotationOffset / 1000;
 
   // Track user interaction and adjust scrolling behavior
   const { userInteracting, setProgrammaticScroll } = useUserInteraction({
@@ -53,7 +54,8 @@ export default function ActivityStream({
         );
         return {
           timestamp: sortedActivities[0].timestamp, // Original timestamp for display
-          effectiveTimestamp: sortedActivities[0].timestamp + annotationOffset, // Adjusted for sorting/comparison
+          effectiveTimestamp:
+            sortedActivities[0].timestamp + annotationOffset / 1000,
           activities: sortedActivities,
         };
       })
@@ -113,27 +115,31 @@ export default function ActivityStream({
   }
 
   return (
-    <div
-      ref={scrollRef}
-      className="scrollbar-container h-full overflow-y-auto bg-secondary"
-    >
-      <div className="space-y-2 p-4">
-        {filteredGroups.length === 0 ? (
-          <div className="py-8 text-center text-muted-foreground">
-            {t("activity.noActivitiesFound")}
-          </div>
-        ) : (
-          filteredGroups.map((group) => (
-            <ActivityGroup
-              key={group.timestamp}
-              group={group}
-              config={config}
-              isCurrent={group.effectiveTimestamp <= currentTime}
-              onSeek={onSeek}
-            />
-          ))
-        )}
+    <div className="relative">
+      <div
+        ref={scrollRef}
+        className="scrollbar-container h-[calc(100vh-70px)] overflow-y-auto bg-secondary"
+      >
+        <div className="space-y-2 p-4">
+          {filteredGroups.length === 0 ? (
+            <div className="py-8 text-center text-muted-foreground">
+              {t("activity.noActivitiesFound")}
+            </div>
+          ) : (
+            filteredGroups.map((group) => (
+              <ActivityGroup
+                key={group.timestamp}
+                group={group}
+                config={config}
+                isCurrent={group.effectiveTimestamp <= currentTime}
+                onSeek={onSeek}
+              />
+            ))
+          )}
+        </div>
       </div>
+
+      <AnnotationOffsetSlider />
     </div>
   );
 }

web/src/contexts/ActivityStreamContext.tsx

@@ -1,4 +1,10 @@
-import React, { createContext, useContext, useState, useMemo } from "react";
+import React, {
+  createContext,
+  useContext,
+  useState,
+  useMemo,
+  useEffect,
+} from "react";
 import { ObjectLifecycleSequence } from "@/types/timeline";
 import { FrigateConfig } from "@/types/frigateConfig";
 import useSWR from "swr";
@@ -8,7 +14,8 @@ interface ActivityStreamContextType {
   selectedObjectTimeline: ObjectLifecycleSequence[] | undefined;
   currentTime: number;
   camera: string;
-  annotationOffset: number;
+  annotationOffset: number; // milliseconds
+  setAnnotationOffset: (ms: number) => void;
   setSelectedObjectId: (id: string | undefined) => void;
   isActivityMode: boolean;
 }
@@ -38,12 +45,15 @@ export function ActivityStreamProvider({
 
   const { data: config } = useSWR<FrigateConfig>("config");
 
-  const annotationOffset = useMemo(() => {
-    if (!config) {
-      return 0;
-    }
+  const [annotationOffset, setAnnotationOffset] = useState<number>(() => {
+    if (!config) return 0;
+    return config.cameras[camera]?.detect?.annotation_offset || 0;
+  });
 
-    return (config.cameras[camera]?.detect?.annotation_offset || 0) / 1000; // Convert to seconds
+  useEffect(() => {
+    if (!config) return;
+    const cfgOffset = config.cameras[camera]?.detect?.annotation_offset || 0;
+    setAnnotationOffset(cfgOffset);
   }, [config, camera]);
 
   const selectedObjectTimeline = useMemo(() => {
@@ -57,6 +67,7 @@ export function ActivityStreamProvider({
     currentTime,
     camera,
     annotationOffset,
+    setAnnotationOffset,
     setSelectedObjectId,
     isActivityMode,
   };