Sub second marker timestamp precision

ui/v2.5/src/components/ScenePlayer/ScenePlayer.tsx

@@ -297,9 +297,13 @@ export const ScenePlayer: React.FC<IScenePlayerProps> = ({
     sendSetTimestamp((value: number) => {
       const player = getPlayer();
       if (player && value >= 0) {
-        player.play()?.then(() => {
+        if (player.hasStarted() && player.paused()) {
           player.currentTime(value);
-        });
+        } else {
+          player.play()?.then(() => {
+            player.currentTime(value);
+          });
+        }
       }
     });
   }, [sendSetTimestamp, getPlayer]);

ui/v2.5/src/components/Scenes/SceneDetails/SceneMarkerForm.tsx

@@ -213,7 +213,7 @@ export const SceneMarkerForm: React.FC<ISceneMarkerForm> = ({
         value={formik.values.seconds}
         setValue={(v) => formik.setFieldValue("seconds", v)}
         onReset={() =>
-          formik.setFieldValue("seconds", Math.round(getPlayerPosition() ?? 0))
+          formik.setFieldValue("seconds", getPlayerPosition() ?? 0)
         }
         error={error}
       />

ui/v2.5/src/components/Shared/DurationInput.tsx

@@ -3,7 +3,7 @@ import {
   faChevronUp,
   faClock,
 } from "@fortawesome/free-solid-svg-icons";
-import React, { useState } from "react";
+import React, { useMemo, useState } from "react";
 import { Button, ButtonGroup, InputGroup, Form } from "react-bootstrap";
 import { Icon } from "./Icon";
 import TextUtils from "src/utils/text";
@@ -19,6 +19,8 @@ interface IProps {
   allowNegative?: boolean;
 }
 
+const includeMS = true;
+
 export const DurationInput: React.FC<IProps> = ({
   disabled,
   value,
@@ -96,17 +98,20 @@ export const DurationInput: React.FC<IProps> = ({
     }
   }
 
-  let inputValue = "";
-  if (tmpValue !== undefined) {
-    inputValue = tmpValue;
-  } else if (value !== null && value !== undefined) {
-    inputValue = TextUtils.secondsToTimestamp(value);
-  }
+  const inputValue = useMemo(() => {
+    if (tmpValue !== undefined) {
+      return tmpValue;
+    } else if (value !== null && value !== undefined) {
+      return TextUtils.secondsToTimestamp(value, includeMS);
+    }
+  }, [value, tmpValue]);
+
+  const format = "hh:mm:ss.ms";
 
   if (placeholder) {
-    placeholder = `${placeholder} (hh:mm:ss)`;
+    placeholder = `${placeholder} (${format})`;
   } else {
-    placeholder = "hh:mm:ss";
+    placeholder = format;
   }
 
   return (

ui/v2.5/src/utils/text.ts

@@ -151,16 +151,20 @@ const fileSizeFractionalDigits = (unit: Unit) => {
   return 0;
 };
 
-// Converts seconds to a hh:mm:ss or mm:ss timestamp.
+// Converts seconds to a [hh:]mm:ss[.ffff] where hh is only shown if hours is non-zero,
+// and ffff is shown only if frameRate is set, and the seconds includes a fractional component.
 // A negative input will result in a -hh:mm:ss or -mm:ss output.
-// Fractional inputs are truncated.
-const secondsToTimestamp = (seconds: number) => {
+const secondsToTimestamp = (secondsInput: number, includeMS?: boolean) => {
   let neg = false;
-  if (seconds < 0) {
+  if (secondsInput < 0) {
     neg = true;
-    seconds = -seconds;
+    secondsInput = -secondsInput;
   }
-  seconds = Math.trunc(seconds);
+
+  const fracSeconds = secondsInput % 1;
+  const ms = Math.round(fracSeconds * 1000);
+
+  let seconds = Math.trunc(secondsInput);
 
   const s = seconds % 60;
   seconds = (seconds - s) / 60;
@@ -177,6 +181,11 @@ const secondsToTimestamp = (seconds: number) => {
     ret = String(m).padStart(2, "0") + ":" + ret;
     ret = String(h) + ":" + ret;
   }
+
+  if (includeMS && ms > 0) {
+    ret += "." + ms.toString().padStart(3, "0");
+  }
+
   if (neg) {
     return "-" + ret;
   } else {
@@ -202,6 +211,24 @@ const timestampToSeconds = (v: string | null | undefined) => {
     return null;
   }
 
+  let secondsPart = splits[splits.length - 1];
+  let msFrac = 0;
+  if (secondsPart.includes(".")) {
+    const secondsParts = secondsPart.split(".");
+    if (secondsParts.length !== 2) {
+      return null;
+    }
+
+    secondsPart = secondsParts[0];
+
+    const msPart = parseInt(secondsParts[1], 10);
+    if (Number.isNaN(msPart)) {
+      return null;
+    }
+
+    msFrac = msPart / 1000;
+  }
+
   let seconds = 0;
   let factor = 1;
   while (splits.length > 0) {
@@ -219,7 +246,7 @@ const timestampToSeconds = (v: string | null | undefined) => {
     factor *= 60;
   }
 
-  return seconds;
+  return seconds + msFrac;
 };
 
 const fileNameFromPath = (path: string) => {