diff --git a/CHANGELOG.md b/CHANGELOG.md
index 830df65..acf34e8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,15 @@ Ce journal suit les **versions du modpack**. Lorsqu'un seul module change, sa ve
 - Depuis `26.2.0-alpha.6`, le pack et les modules ont des versions indépendantes. I Like To Move It et Only Fun deviennent les cinquième et sixième modules actifs dans l'alpha 46.
 - Les versions ci-dessous ont été reconstituées à partir des JAR archivés, des packs locaux et du code source actuel. Les dates n'étant pas enregistrées de manière fiable, elles ne sont pas inventées.
 
+## Modifications non distribuées
+
+Module modifié : **Ambiance `0.0.0-alpha.17`**.
+
+- attend de façon bornée la synchronisation client du jukebox avant de charger un disque blanc, ce qui rétablit sa lecture en solo ;
+- affiche immédiatement le chargement puis un échec explicite si le jukebox n'est toujours pas synchronisé après cinq secondes ;
+- accepte toujours les liens de partage YouTube avec paramètres, notamment `https://youtu.be/Ue5ZBe-GzSM?si=…` ;
+- conserve les données Ambiance v2 et le protocole réseau 6, sans migration de sauvegarde.
+
 ## `26.2.0-alpha.213`
 
 Module modifié : **Ambiance `0.0.0-alpha.16`**. Les neuf autres modules conservent leur version issue de l'alpha.212.
diff --git a/ambiance/build.gradle b/ambiance/build.gradle
index 5b08cfc..d5ca96a 100644
--- a/ambiance/build.gradle
+++ b/ambiance/build.gradle
@@ -70,7 +70,7 @@ tasks.named("test") {
 
 tasks.register("verifyAmbiance") {
 	group = "verification"
-	description = "Checks Ambiance alpha.16, including the Minecraft 26.2 white-disc event hook."
+	description = "Checks Ambiance alpha.17, including deferred white-disc playback startup."
 	inputs.files(fileTree("src/main/java"))
 	inputs.files(fileTree("src/main/resources"))
 	inputs.file(rootProject.file("pack/migrations/26.2.0-alpha.125-realtime-calendar-to-alpha.126.json"))
@@ -123,7 +123,7 @@ tasks.register("verifyAmbiance") {
 		def levelEventMixin = file(
 			"src/main/java/fr/koka99cab/sanctuary26/ambiance/mixin/client/LevelEventHandlerMixin.java").text
 
-		if (project.version.toString() != "0.0.0-alpha.16"
+		if (project.version.toString() != "0.0.0-alpha.17"
 			|| migration.source?.pack_version != "26.2.0-alpha.125"
 			|| migration.target?.pack_version != "26.2.0-alpha.126"
 			|| migration.target?.modules?.ambiance != "0.0.0-alpha.1"
@@ -321,7 +321,9 @@ tasks.register("verifyAmbiance") {
 			|| !javaText.contains('PlayerLookup.tracking(level, pos)')
 			|| !javaText.contains('ServerPlayNetworking.canSend(receiver, WhiteDiscPlaybackPayload.ID)')
 			|| !javaText.contains('MAXIMUM_SIMULTANEOUS_DISCS = 4')
-			|| !javaText.contains('REQUESTS.size() + PLAYBACKS.size() >= MAXIMUM_SIMULTANEOUS_DISCS')
+			|| !javaText.contains('PENDING_STARTS.size() + REQUESTS.size() + PLAYBACKS.size()')
+			|| !javaText.contains('MAXIMUM_START_WAIT_TICKS = 100')
+			|| !javaText.contains('tickPendingStarts(client)')
 			|| !javaText.contains('client.level.dimension().equals(playback.dimension())')
 			|| !javaText.contains('MAXIMUM_TRACK_MILLIS = 30L * 60L * 1_000L')
 			|| !javaText.contains('new Pcm16AudioDataFormat(1, LavaplayerAudioStream.SAMPLE_RATE')
@@ -347,7 +349,7 @@ tasks.register("verifyAmbiance") {
 			}
 			|| !file("build.gradle").text.contains('dev.arbjerg:lavaplayer:2.2.7')
 			|| !file("build.gradle").text.contains('dev.lavalink.youtube:v2:1.18.2')) {
-			throw new GradleException("Ambiance alpha.16 white-disc playback contract is incomplete")
+			throw new GradleException("Ambiance alpha.17 white-disc playback contract is incomplete")
 		}
 
 		[
diff --git a/ambiance/src/main/java/fr/koka99cab/sanctuary26/ambiance/client/audio/WhiteDiscAudioPlayer.java b/ambiance/src/main/java/fr/koka99cab/sanctuary26/ambiance/client/audio/WhiteDiscAudioPlayer.java
index 0001011..18feb44 100644
--- a/ambiance/src/main/java/fr/koka99cab/sanctuary26/ambiance/client/audio/WhiteDiscAudioPlayer.java
+++ b/ambiance/src/main/java/fr/koka99cab/sanctuary26/ambiance/client/audio/WhiteDiscAudioPlayer.java
@@ -30,10 +30,12 @@ import net.minecraft.world.phys.Vec3;
 /** Client-only, positional and resource-bounded YouTube playback for white discs. */
 public final class WhiteDiscAudioPlayer {
 	private static final int MAXIMUM_SIMULTANEOUS_DISCS = 4;
+	private static final int MAXIMUM_START_WAIT_TICKS = 100;
 	private static final long MAXIMUM_TRACK_MILLIS = 30L * 60L * 1_000L;
 	private static final long FINISHED_GRACE_NANOS = 5_000_000_000L;
 	private static final float ATTENUATION_DISTANCE = 64.0F;
 	private static final DefaultAudioPlayerManager MANAGER = createManager();
+	private static final Map<Long, PendingStart> PENDING_STARTS = new HashMap<>();
 	private static final Map<Long, Long> REQUESTS = new HashMap<>();
 	private static final LinkedHashMap<Long, Playback> PLAYBACKS = new LinkedHashMap<>();
 	private static long requestSequence;
@@ -43,16 +45,27 @@ public final class WhiteDiscAudioPlayer {
 	}
 
 	public static void play(Minecraft client, BlockPos pos, String videoId) {
-		if (shutdown || !WhiteDiscUrl.validVideoId(videoId) || !validTarget(client, pos)) return;
+		if (shutdown || !WhiteDiscUrl.validVideoId(videoId) || !validJukeboxTarget(client, pos)) return;
 		long key = pos.asLong();
-		if (REQUESTS.containsKey(key)) return;
+		if (PENDING_STARTS.containsKey(key) || REQUESTS.containsKey(key)) return;
 		boolean replacingPlayback = PLAYBACKS.containsKey(key);
 		if (!replacingPlayback
-			&& REQUESTS.size() + PLAYBACKS.size() >= MAXIMUM_SIMULTANEOUS_DISCS) return;
+			&& PENDING_STARTS.size() + REQUESTS.size() + PLAYBACKS.size()
+				>= MAXIMUM_SIMULTANEOUS_DISCS) return;
 		stop(key);
+		client.player.sendOverlayMessage(Component.translatable("message.ambiance.white_disc.loading"));
+		if (!validTarget(client, pos)) {
+			PENDING_STARTS.put(key, new PendingStart(pos.immutable(), client.level.dimension(), videoId,
+				MAXIMUM_START_WAIT_TICKS));
+			return;
+		}
+		startLoading(client, pos, videoId);
+	}
+
+	private static void startLoading(Minecraft client, BlockPos pos, String videoId) {
+		long key = pos.asLong();
 		long request = ++requestSequence;
 		REQUESTS.put(key, request);
-		client.player.sendOverlayMessage(Component.translatable("message.ambiance.white_disc.loading"));
 		MANAGER.loadItemOrdered(key, WhiteDiscUrl.canonicalUrl(videoId), new AudioLoadResultHandler() {
 			@Override
 			public void trackLoaded(AudioTrack track) {
@@ -137,6 +150,7 @@ public final class WhiteDiscAudioPlayer {
 	}
 
 	private static void stop(long key) {
+		PENDING_STARTS.remove(key);
 		REQUESTS.remove(key);
 		Playback playback = PLAYBACKS.remove(key);
 		if (playback == null) return;
@@ -150,6 +164,7 @@ public final class WhiteDiscAudioPlayer {
 			clear();
 			return;
 		}
+		tickPendingStarts(client);
 		long now = System.nanoTime();
 		for (Map.Entry<Long, Playback> entry : Map.copyOf(PLAYBACKS).entrySet()) {
 			Playback playback = entry.getValue();
@@ -167,6 +182,7 @@ public final class WhiteDiscAudioPlayer {
 	}
 
 	public static void clear() {
+		PENDING_STARTS.clear();
 		REQUESTS.clear();
 		for (long key : PLAYBACKS.keySet().stream().mapToLong(Long::longValue).toArray()) stop(key);
 	}
@@ -189,11 +205,46 @@ public final class WhiteDiscAudioPlayer {
 	}
 
 	private static boolean validTarget(Minecraft client, BlockPos pos) {
+		return validJukeboxTarget(client, pos)
+			&& client.level.getBlockState(pos).getValue(JukeboxBlock.HAS_RECORD);
+	}
+
+	private static boolean validJukeboxTarget(Minecraft client, BlockPos pos) {
 		return client.player != null && client.level != null
 			&& client.player.distanceToSqr(Vec3.atCenterOf(pos))
 				<= ATTENUATION_DISTANCE * ATTENUATION_DISTANCE * 4.0D
-			&& client.level.getBlockState(pos).is(Blocks.JUKEBOX)
-			&& client.level.getBlockState(pos).getValue(JukeboxBlock.HAS_RECORD);
+			&& client.level.getBlockState(pos).is(Blocks.JUKEBOX);
+	}
+
+	private static void tickPendingStarts(Minecraft client) {
+		for (Map.Entry<Long, PendingStart> entry : Map.copyOf(PENDING_STARTS).entrySet()) {
+			long key = entry.getKey();
+			PendingStart pending = entry.getValue();
+			if (!client.level.dimension().equals(pending.dimension())
+				|| !validJukeboxTarget(client, pending.pos())) {
+				PENDING_STARTS.remove(key);
+				continue;
+			}
+			if (validTarget(client, pending.pos())) {
+				PENDING_STARTS.remove(key);
+				startLoading(client, pending.pos(), pending.videoId());
+				continue;
+			}
+			if (pending.ticksRemaining() <= 1) {
+				PENDING_STARTS.remove(key);
+				if (client.player != null) client.player.sendOverlayMessage(
+					Component.translatable("message.ambiance.white_disc.failed"));
+				continue;
+			}
+			PENDING_STARTS.put(key, pending.waitOneTick());
+		}
+	}
+
+	private record PendingStart(BlockPos pos, ResourceKey<Level> dimension, String videoId,
+		int ticksRemaining) {
+		private PendingStart waitOneTick() {
+			return new PendingStart(pos, dimension, videoId, ticksRemaining - 1);
+		}
 	}
 
 	private record Playback(BlockPos pos, ResourceKey<Level> dimension,
diff --git a/ambiance/src/test/java/fr/koka99cab/sanctuary26/ambiance/white_disc/WhiteDiscUrlSmoke.java b/ambiance/src/test/java/fr/koka99cab/sanctuary26/ambiance/white_disc/WhiteDiscUrlSmoke.java
index 821d55b..e81cd91 100644
--- a/ambiance/src/test/java/fr/koka99cab/sanctuary26/ambiance/white_disc/WhiteDiscUrlSmoke.java
+++ b/ambiance/src/test/java/fr/koka99cab/sanctuary26/ambiance/white_disc/WhiteDiscUrlSmoke.java
@@ -10,6 +10,8 @@ public final class WhiteDiscUrlSmoke {
 	public static void main(String[] args) {
 		require(VIDEO_ID.equals(id("https://www.youtube.com/watch?v=" + VIDEO_ID)), "watch URL rejected");
 		require(VIDEO_ID.equals(id("https://youtu.be/" + VIDEO_ID + "?si=abc")), "short URL rejected");
+		require("Ue5ZBe-GzSM".equals(id("https://youtu.be/Ue5ZBe-GzSM?si=78LSbtBQzUYzhA2Y")),
+			"reported white-disc URL rejected");
 		require(VIDEO_ID.equals(id("https://music.youtube.com/watch?v=" + VIDEO_ID)), "music URL rejected");
 		require(VIDEO_ID.equals(id("https://www.youtube.com/shorts/" + VIDEO_ID)), "shorts URL rejected");
 		require(VIDEO_ID.equals(id("https://www.youtube.com/embed/" + VIDEO_ID)), "embed URL rejected");
diff --git a/build.gradle b/build.gradle
index aac6c21..55ade92 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4548,7 +4548,7 @@ tasks.register("verifyWeatherTntAmbianceRelease") {
 		def ouchManifest = new JsonSlurper().parse(file("ouch/src/main/resources/fabric.mod.json"))
 		def rootBuild = file("build.gradle").text
 		if (rootProject.pack_version != "26.2.0-alpha.213"
-			|| rootProject.ambiance_version != "0.0.0-alpha.16"
+			|| rootProject.ambiance_version != "0.0.0-alpha.17"
 			|| rootProject.ouch_version != "0.0.0-alpha.10"
 			|| migration.source?.pack_version != "26.2.0-alpha.199"
 			|| migration.source?.modules != [ambiance: "0.0.0-alpha.11", ouch: "0.0.0-alpha.8"]
@@ -5319,7 +5319,7 @@ tasks.register("verifyCanapliaFoundation") {
 			"ambiance/src/main/java/fr/koka99cab/sanctuary26/ambiance/api/visual/AmbianceVisualEffectApi.java").text
 		if (rootProject.pack_version != "26.2.0-alpha.213"
 			|| rootProject.itsalive_version != "0.0.0-alpha.36"
-			|| rootProject.ambiance_version != "0.0.0-alpha.16"
+			|| rootProject.ambiance_version != "0.0.0-alpha.17"
 			|| migration.issue != 35
 			|| migration.source?.fabric_id != "canaplia"
 			|| migration.source?.version != "2.0.0"
@@ -5570,7 +5570,7 @@ tasks.register("verifyCanapliaAlpha209Release") {
 			itsalive: "0.0.0-alpha.33",
 			onlyfun: "0.0.0-alpha.20"]
 		if (rootProject.pack_version != "26.2.0-alpha.213"
-			|| rootProject.ambiance_version != "0.0.0-alpha.16"
+			|| rootProject.ambiance_version != "0.0.0-alpha.17"
 			|| rootProject.itsalive_version != "0.0.0-alpha.36"
 			|| rootProject.onlyfun_version != "0.0.0-alpha.24"
 			|| migration.source?.pack_version != "26.2.0-alpha.207"
@@ -5785,7 +5785,7 @@ tasks.register("verifyAlpha211Release") {
 		def currentModules = expectedTarget + [
 			sanctuary: "0.0.0-alpha.120",
 			ambiance: "0.0.0-alpha.16"]
-		def workspaceModules = currentModules + [ambiance: "0.0.0-alpha.16"]
+		def workspaceModules = currentModules + [ambiance: "0.0.0-alpha.17"]
 		def expectedDataVersions = [ambiance: 2, itsalive: 3, onlyfun: 2, ouch: 1, sanctuary: 11]
 		def expectedProtocols = [ambiance: 6, itsalive: 4, onlyfun: 3, ouch: 1, sanctuary: 22]
 		def manifests = expectedTarget.collectEntries { id, version ->
@@ -5948,7 +5948,7 @@ tasks.register("verifyAlpha213Release") {
 			it.path == "mods/jei-26.2-fabric-30.28.0.193.jar"
 		}
 		if (rootProject.pack_version != "26.2.0-alpha.213"
-			|| rootProject.ambiance_version != "0.0.0-alpha.16"
+			|| rootProject.ambiance_version != "0.0.0-alpha.17"
 			|| migration.source?.pack_version != "26.2.0-alpha.212"
 			|| migration.source?.modules != [ambiance: "0.0.0-alpha.15"]
 			|| migration.target?.pack_version != "26.2.0-alpha.213"
@@ -5980,7 +5980,6 @@ tasks.register("verifyAlpha213Release") {
 			|| !packwizIndex.contains('file = "mods/ambiance-0.0.0-alpha.16.jar"')
 			|| packwizIndex.contains('file = "mods/ambiance-0.0.0-alpha.15.jar"')
 			|| !changelog.contains("## `26.2.0-alpha.213`")
-			|| changelog.contains("## Modifications non distribuées")
 			|| !readme.contains("Version courante du pack distribué : **`26.2.0-alpha.213`**")) {
 			throw new GradleException("The alpha.213 Ambiance startup-fix release is incomplete")
 		}
diff --git a/gradle.properties b/gradle.properties
index 17830f7..5df3b37 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -12,7 +12,7 @@ fabric_api_version=0.158.0+26.2
 # Standby modules stay at zero until their migration really begins.
 mod_version=0.0.0-alpha.0
 module_lifecycle=standby
-ambiance_version=0.0.0-alpha.16
+ambiance_version=0.0.0-alpha.17
 ambiance_lifecycle=active
 redstoner_version=0.0.0-alpha.10
 redstoner_lifecycle=active