player: use vidstsack instead of default html player

bun.lock

@@ -19,6 +19,7 @@
         "svelte-check": "^4.4.2",
         "tailwindcss": "^4.1.18",
         "typescript": "^5.9.3",
+        "vidstack": "^1.12.13",
         "vite": "^7.3.1",
         "vite-plugin-devtools-json": "^1.0.0",
         "wrangler": "^4.81.1",
@@ -98,6 +99,12 @@
 
     "@esbuild/win32-x64": ["@esbuild/win32-x64@0.27.7", "", { "os": "win32", "cpu": "x64" }, "sha512-56hiAJPhwQ1R4i+21FVF7V8kSD5zZTdHcVuRFMW0hn753vVfQN8xlx4uOPT4xoGH0Z/oVATuR82AiqSTDIpaHg=="],
 
+    "@floating-ui/core": ["@floating-ui/core@1.7.5", "", { "dependencies": { "@floating-ui/utils": "^0.2.11" } }, "sha512-1Ih4WTWyw0+lKyFMcBHGbb5U5FtuHJuujoyyr5zTaWS5EYMeT6Jb2AuDeftsCsEuchO+mM2ij5+q9crhydzLhQ=="],
+
+    "@floating-ui/dom": ["@floating-ui/dom@1.7.6", "", { "dependencies": { "@floating-ui/core": "^1.7.5", "@floating-ui/utils": "^0.2.11" } }, "sha512-9gZSAI5XM36880PPMm//9dfiEngYoC6Am2izES1FF406YFsjvyBMmeJ2g4SAju3xWwtuynNRFL2s9hgxpLI5SQ=="],
+
+    "@floating-ui/utils": ["@floating-ui/utils@0.2.11", "", {}, "sha512-RiB/yIh78pcIxl6lLMG0CgBXAZ2Y0eVHqMPYugu+9U0AeT6YBeiJpf7lbdJNIugFP5SIjwNRgo4DhR1Qxi26Gg=="],
+
     "@img/colour": ["@img/colour@1.1.0", "", {}, "sha512-Td76q7j57o/tLVdgS746cYARfSyxk8iEfRxewL9h4OMzYhbW4TAcppl0mT4eyqXddh6L/jwoM75mo7ixa/pCeQ=="],
 
     "@img/sharp-darwin-arm64": ["@img/sharp-darwin-arm64@0.34.5", "", { "optionalDependencies": { "@img/sharp-libvips-darwin-arm64": "1.2.4" }, "os": "darwin", "cpu": "arm64" }, "sha512-imtQ3WMJXbMY4fxb/Ndp6HBTNVtWCUI0WdobyheGf5+ad6xX8VIDO8u2xE4qc/fr08CKG/7dDseFtn6M6g/r3w=="],
@@ -342,10 +349,14 @@
 
     "lightningcss-win32-x64-msvc": ["lightningcss-win32-x64-msvc@1.32.0", "", { "os": "win32", "cpu": "x64" }, "sha512-Amq9B/SoZYdDi1kFrojnoqPLxYhQ4Wo5XiL8EVJrVsB8ARoC1PWW6VGtT0WKCemjy8aC+louJnjS7U18x3b06Q=="],
 
+    "lit-html": ["lit-html@2.8.0", "", { "dependencies": { "@types/trusted-types": "^2.0.2" } }, "sha512-o9t+MQM3P4y7M7yNzqAyjp7z+mQGa4NS4CxiyLqFPyFWyc4O+nodLrkrxSaCTrla6M5YOLaT3RpbbqjszB5g3Q=="],
+
     "locate-character": ["locate-character@3.0.0", "", {}, "sha512-SW13ws7BjaeJ6p7Q6CO2nchbYEc3X3J6WrmTTDto7yMPqVSZTUyY5Tjbid+Ab8gLnATtygYtiDIJGQRRn2ZOiA=="],
 
     "magic-string": ["magic-string@0.30.21", "", { "dependencies": { "@jridgewell/sourcemap-codec": "^1.5.5" } }, "sha512-vd2F4YUyEXKGcLHoq+TEyCjxueSeHnFxyyjNp80yg0XV4vUhnDer/lvvlqM/arB5bXQN5K2/3oinyCRyx8T2CQ=="],
 
+    "media-captions": ["media-captions@1.0.4", "", {}, "sha512-cyDNmuZvvO4H27rcBq2Eudxo9IZRDCOX/I7VEyqbxsEiD2Ei7UYUhG/Sc5fvMZjmathgz3fEK7iAKqvpY+Ux1w=="],
+
     "miniflare": ["miniflare@4.20260409.0", "", { "dependencies": { "@cspotcode/source-map-support": "0.8.1", "sharp": "^0.34.5", "undici": "7.24.4", "workerd": "1.20260409.1", "ws": "8.18.0", "youch": "4.1.0-beta.10" }, "bin": { "miniflare": "bootstrap.js" } }, "sha512-ayl6To4av0YuXsSivGgWLj+Ug8xZ0Qz3sGV8+Ok2LhNVl6m8m5ktEBM3LX9iT9MtLZRJwBlJrKcraNs/DlZQfA=="],
 
     "mri": ["mri@1.2.0", "", {}, "sha512-tzzskb3bG8LvYGFF/mDTpq3jpI6Q9wc3LEmBaghu+DdCssd1FakN7Bc0hVNmEyGq1bq3RgfkCb3cmQLpNPOroA=="],
@@ -424,16 +435,22 @@
 
     "unenv": ["unenv@2.0.0-rc.24", "", { "dependencies": { "pathe": "^2.0.3" } }, "sha512-i7qRCmY42zmCwnYlh9H2SvLEypEFGye5iRmEMKjcGi7zk9UquigRjFtTLz0TYqr0ZGLZhaMHl/foy1bZR+Cwlw=="],
 
+    "unplugin": ["unplugin@1.16.1", "", { "dependencies": { "acorn": "^8.14.0", "webpack-virtual-modules": "^0.6.2" } }, "sha512-4/u/j4FrCKdi17jaxuJA0jClGxB1AvU2hw/IuayPc4ay1XGaJs/rbb4v5WKwAjNifjmXK9PIFyuPiaK8azyR9w=="],
+
     "url-polyfill": ["url-polyfill@1.1.14", "", {}, "sha512-p4f3TTAG6ADVF3mwbXw7hGw+QJyw5CnNGvYh5fCuQQZIiuKUswqcznyV3pGDP9j0TSmC4UvRKm8kl1QsX1diiQ=="],
 
     "uuid": ["uuid@11.1.0", "", { "bin": { "uuid": "dist/esm/bin/uuid" } }, "sha512-0/A9rDy9P7cJ+8w1c9WD9V//9Wj15Ce2MPz8Ri6032usz+NfePxx5AcN3bN+r6ZL6jEo066/yNYB3tn4pQEx+A=="],
 
+    "vidstack": ["vidstack@1.12.13", "", { "dependencies": { "@floating-ui/dom": "^1.6.10", "lit-html": "^2.8.0", "media-captions": "^1.0.4", "unplugin": "^1.12.0" } }, "sha512-vuNeyRmWoH/7EoFVDYjp9nkgcqtCMmal518LDeb78dYKgWb+p6+vtY0AzDhrkBv5q1UiCn+xwmjMmwvSlPLuhQ=="],
+
     "vite": ["vite@7.3.2", "", { "dependencies": { "esbuild": "^0.27.0", "fdir": "^6.5.0", "picomatch": "^4.0.3", "postcss": "^8.5.6", "rollup": "^4.43.0", "tinyglobby": "^0.2.15" }, "optionalDependencies": { "fsevents": "~2.3.3" }, "peerDependencies": { "@types/node": "^20.19.0 || >=22.12.0", "jiti": ">=1.21.0", "less": "^4.0.0", "lightningcss": "^1.21.0", "sass": "^1.70.0", "sass-embedded": "^1.70.0", "stylus": ">=0.54.8", "sugarss": "^5.0.0", "terser": "^5.16.0", "tsx": "^4.8.1", "yaml": "^2.4.2" }, "optionalPeers": ["@types/node", "jiti", "less", "lightningcss", "sass", "sass-embedded", "stylus", "sugarss", "terser", "tsx", "yaml"], "bin": { "vite": "bin/vite.js" } }, "sha512-Bby3NOsna2jsjfLVOHKes8sGwgl4TT0E6vvpYgnAYDIF/tie7MRaFthmKuHx1NSXjiTueXH3do80FMQgvEktRg=="],
 
     "vite-plugin-devtools-json": ["vite-plugin-devtools-json@1.0.0", "", { "dependencies": { "uuid": "^11.1.0" }, "peerDependencies": { "vite": "^5.0.0 || ^6.0.0 || ^7.0.0" } }, "sha512-MobvwqX76Vqt/O4AbnNMNWoXWGrKUqZbphCUle/J2KXH82yKQiunOeKnz/nqEPosPsoWWPP9FtNuPBSYpiiwkw=="],
 
     "vitefu": ["vitefu@1.1.3", "", { "peerDependencies": { "vite": "^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0 || ^7.0.0 || ^8.0.0" }, "optionalPeers": ["vite"] }, "sha512-ub4okH7Z5KLjb6hDyjqrGXqWtWvoYdU3IGm/NorpgHncKoLTCfRIbvlhBm7r0YstIaQRYlp4yEbFqDcKSzXSSg=="],
 
+    "webpack-virtual-modules": ["webpack-virtual-modules@0.6.2", "", {}, "sha512-66/V2i5hQanC51vBQKPH4aI8NMAcBW59FVBs+rC7eGHupMyfn34q7rZIE+ETlJ+XTevqfUhVVBgSUNSW2flEUQ=="],
+
     "workerd": ["workerd@1.20260409.1", "", { "optionalDependencies": { "@cloudflare/workerd-darwin-64": "1.20260409.1", "@cloudflare/workerd-darwin-arm64": "1.20260409.1", "@cloudflare/workerd-linux-64": "1.20260409.1", "@cloudflare/workerd-linux-arm64": "1.20260409.1", "@cloudflare/workerd-windows-64": "1.20260409.1" }, "bin": { "workerd": "bin/workerd" } }, "sha512-kuWP20fAaqaLBqLbvUfY9nCF6c3C78L60G9lS6eVwBf+v8trVFIsAdLB/FtrnKm7vgVvpDzvFAfB80VIiVj95w=="],
 
     "worktop": ["worktop@0.8.0-next.18", "", { "dependencies": { "mrmime": "^2.0.0", "regexparam": "^3.0.0" } }, "sha512-+TvsA6VAVoMC3XDKR5MoC/qlLqDixEfOBysDEKnPIPou/NvoPWCAuXHXMsswwlvmEuvX56lQjvELLyLuzTKvRw=="],

package.json

@@ -33,6 +33,7 @@
 		"svelte-check": "^4.4.2",
 		"tailwindcss": "^4.1.18",
 		"typescript": "^5.9.3",
+		"vidstack": "^1.12.13",
 		"vite": "^7.3.1",
 		"vite-plugin-devtools-json": "^1.0.0",
 		"wrangler": "^4.81.1"

spacetimedb/src/index.ts

@@ -6,6 +6,7 @@ const spacetimedb = schema({
 		{
 			id: t.u64().primaryKey(),
 			url: t.string(),
+			subtitleUrl: t.string(),
 			timePosition: t.f64(),
 			isPlaying: t.bool(),
 			lastUpdatedAt: t.timestamp(),
@@ -19,6 +20,7 @@ export const init = spacetimedb.init((ctx) => {
 	ctx.db.videoState.insert({
 		id: 1n,
 		url: "https://cdn.cazzzer.com/LycoReco08.mkv",
+		subtitleUrl: "",
 		timePosition: 0.0,
 		isPlaying: false,
 		lastUpdatedAt: ctx.timestamp,
@@ -34,6 +36,7 @@ export const set_url = spacetimedb.reducer({ url: t.string() }, (ctx, { url }) =
 	ctx.db.videoState.id.update({
 		...row,
 		url,
+		subtitleUrl: "", // Clear subtitle on new video
 		timePosition: 0.0,
 		isPlaying: false,
 		lastUpdatedAt: ctx.timestamp,
@@ -71,3 +74,13 @@ export const seek = spacetimedb.reducer({ time_position: t.f64() }, (ctx, { time
 		lastUpdatedAt: ctx.timestamp,
 	});
 });
+
+export const set_subtitle_url = spacetimedb.reducer({ url: t.string() }, (ctx, { url }) => {
+	const row = ctx.db.videoState.id.find(1n);
+	if (!row) return;
+	ctx.db.videoState.id.update({
+		...row,
+		subtitleUrl: url,
+		lastUpdatedAt: ctx.timestamp,
+	});
+});

src/lib/st-bindings/index.ts

@@ -37,6 +37,7 @@ import {
 import PauseReducer from "./pause_reducer";
 import PlayReducer from "./play_reducer";
 import SeekReducer from "./seek_reducer";
+import SetSubtitleUrlReducer from "./set_subtitle_url_reducer";
 import SetUrlReducer from "./set_url_reducer";
 
 // Import all procedure arg schemas
@@ -66,6 +67,7 @@ const reducersSchema = __reducers(
   __reducerSchema("pause", PauseReducer),
   __reducerSchema("play", PlayReducer),
   __reducerSchema("seek", SeekReducer),
+  __reducerSchema("set_subtitle_url", SetSubtitleUrlReducer),
   __reducerSchema("set_url", SetUrlReducer),
 );
 

src/lib/st-bindings/set_subtitle_url_reducer.ts

@@ -0,0 +1,15 @@
+// THIS FILE IS AUTOMATICALLY GENERATED BY SPACETIMEDB. EDITS TO THIS FILE
+// WILL NOT BE SAVED. MODIFY TABLES IN YOUR MODULE SOURCE CODE INSTEAD.
+
+/* eslint-disable */
+/* tslint:disable */
+import {
+  TypeBuilder as __TypeBuilder,
+  t as __t,
+  type AlgebraicTypeType as __AlgebraicTypeType,
+  type Infer as __Infer,
+} from "spacetimedb";
+
+export default {
+  url: __t.string(),
+};

src/lib/st-bindings/types.ts

@@ -13,6 +13,7 @@ import {
 export const VideoState = __t.object("VideoState", {
   id: __t.u64(),
   url: __t.string(),
+  subtitleUrl: __t.string(),
   timePosition: __t.f64(),
   isPlaying: __t.bool(),
   lastUpdatedAt: __t.timestamp(),

src/lib/st-bindings/types/reducers.ts

@@ -9,10 +9,12 @@ import { type Infer as __Infer } from "spacetimedb";
 import PauseReducer from "../pause_reducer";
 import PlayReducer from "../play_reducer";
 import SeekReducer from "../seek_reducer";
+import SetSubtitleUrlReducer from "../set_subtitle_url_reducer";
 import SetUrlReducer from "../set_url_reducer";
 
 export type PauseParams = __Infer<typeof PauseReducer>;
 export type PlayParams = __Infer<typeof PlayReducer>;
 export type SeekParams = __Infer<typeof SeekReducer>;
+export type SetSubtitleUrlParams = __Infer<typeof SetSubtitleUrlReducer>;
 export type SetUrlParams = __Infer<typeof SetUrlReducer>;
 

src/lib/st-bindings/video_state_table.ts

@@ -13,6 +13,7 @@ import {
 export default __t.row({
   id: __t.u64().primaryKey(),
   url: __t.string(),
+  subtitleUrl: __t.string().name("subtitle_url"),
   timePosition: __t.f64().name("time_position"),
   isPlaying: __t.bool().name("is_playing"),
   lastUpdatedAt: __t.timestamp().name("last_updated_at"),

src/routes/+page.svelte

@@ -1,6 +1,8 @@
 <script lang="ts">
 	import { useSpacetimeDB, useTable, useReducer } from "spacetimedb/svelte";
 	import { tables, reducers } from "$lib/st-bindings";
+	import "vidstack/bundle";
+	import type { MediaPlayerElement } from "vidstack/elements";
 
 	const conn = useSpacetimeDB();
 
@@ -8,12 +10,14 @@
 	const videoState = $derived($videoStates.find((state) => state.id === 1n));
 
 	const setUrlReducer = useReducer(reducers.setUrl);
+	const setSubtitleUrlReducer = useReducer(reducers.setSubtitleUrl);
 	const playReducer = useReducer(reducers.play);
 	const pauseReducer = useReducer(reducers.pause);
 	const seekReducer = useReducer(reducers.seek);
 
-	let videoElement: HTMLVideoElement | undefined = $state();
+	let videoElement: MediaPlayerElement | undefined = $state();
 	let newUrl = $state("");
+	let newSubtitleUrl = $state("");
 
 	let isSyncing = false;
 	let syncTimeout: ReturnType<typeof setTimeout> | undefined;
@@ -32,10 +36,6 @@
 		const el = videoElement;
 		const state = videoState;
 
-		if (el.src !== state.url) {
-			el.src = state.url;
-		}
-
 		// Account for server to client clock drift slightly, but MVP assumes relatively synced clocks.
 		const timeElapsedMicros = BigInt(Date.now()) * 1000n - state.lastUpdatedAt.microsSinceUnixEpoch;
 		const expectedTime = state.isPlaying
@@ -45,8 +45,9 @@
 		const diff = Math.abs(el.currentTime - expectedTime);
 
 		if (!state.isPlaying) {
-			if (el.currentTime < expectedTime && diff <= 2 && !el.paused) {
+			if (el.currentTime < expectedTime && diff <= 2) {
 				// Behind pause point. Keep playing to catch up. (timeupdate will pause it)
+				// If locally paused, stay paused (we likely dispatched the pause event + buffer)
 			} else {
 				// Ahead or reached pause point. Pause and rewind if needed.
 				syncAction(() => {
@@ -72,12 +73,14 @@
 
 	function handlePlay() {
 		if (isSyncing) return;
-		playReducer({ timePosition: videoElement?.currentTime ?? 0 });
+		// Send play slightly in future to adjust for network latency
+		playReducer({ timePosition: (videoElement?.currentTime ?? 0) + 0.15 });
 	}
 
 	function handlePause() {
 		if (isSyncing) return;
-		pauseReducer({ timePosition: videoElement?.currentTime ?? 0 });
+		// Send pause slightly in future, so remote clients coast into it
+		pauseReducer({ timePosition: (videoElement?.currentTime ?? 0) + 0.15 });
 	}
 
 	function handleSeeked() {
@@ -108,6 +111,13 @@
 		setUrlReducer({ url: newUrl });
 		newUrl = "";
 	}
+
+	function handleSetSubtitle(e: SubmitEvent) {
+		e.preventDefault();
+		if (!newSubtitleUrl.trim() || !$conn.isActive) return;
+		setSubtitleUrlReducer({ url: newSubtitleUrl });
+		newSubtitleUrl = "";
+	}
 </script>
 
 <div class="p-4">
@@ -131,18 +141,42 @@
 		<button type="submit" class="p-2" disabled={!$conn.isActive}>Set URL</button>
 	</form>
 
+	<form onsubmit={handleSetSubtitle} class="mb-2">
+		<input
+			type="url"
+			placeholder="Enter subtitle track URL (.vtt)"
+			bind:value={newSubtitleUrl}
+			class="mr-2 w-96 p-2"
+		/>
+		<button type="submit" class="p-2">Set Subtitles</button>
+	</form>
+
 	<div>
-		<!-- svelte-ignore a11y_media_has_caption -->
+		{#if videoState?.url}
-		<video
+			<media-player
 				bind:this={videoElement}
-			controls
+				src={videoState.url}
+				muted
+				crossOrigin
 				onplay={handlePlay}
 				onpause={handlePause}
 				onseeked={handleSeeked}
 				ontimeupdate={handleTimeUpdate}
 				class="w-full max-w-2xl bg-black"
 			>
-			Your browser does not support the video tag.
+				<media-provider>
-		</video>
+					{#if videoState?.subtitleUrl}
+						<track
+							src={videoState.subtitleUrl}
+							kind="subtitles"
+							srclang="en"
+							label="English"
+							default
+						/>
+					{/if}
+				</media-provider>
+				<media-video-layout> </media-video-layout>
+			</media-player>
+		{/if}
 	</div>
 </div>

tsconfig.json

@@ -11,7 +11,11 @@
 		"sourceMap": true,
 		"strict": true,
 		"moduleResolution": "bundler",
-		"types": ["./src/worker-configuration.d.ts", "node"]
+		"types": [
+			"./src/worker-configuration.d.ts",
+			"node",
+			"vidstack/svelte",
+		]
 	}
 	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
 	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files

vite.config.ts

@@ -2,5 +2,6 @@ import devtoolsJson from "vite-plugin-devtools-json";
 import tailwindcss from "@tailwindcss/vite";
 import { sveltekit } from "@sveltejs/kit/vite";
 import { defineConfig } from "vite";
+import { vite as vidstack } from "vidstack/plugins";
 
-export default defineConfig({ plugins: [tailwindcss(), sveltekit(), devtoolsJson()] });
+export default defineConfig({ plugins: [tailwindcss(), vidstack(), sveltekit(), devtoolsJson()] });