diff --git a/ui/src/main/java/dev/quoije/umd/ui/PlayerApp.java b/ui/src/main/java/dev/quoije/umd/ui/PlayerApp.java
index e3d1951..19e49b3 100644
--- a/ui/src/main/java/dev/quoije/umd/ui/PlayerApp.java
+++ b/ui/src/main/java/dev/quoije/umd/ui/PlayerApp.java
@@ -200,6 +200,12 @@ public final class PlayerApp extends Application {
             try (UmdIsoReader iso = new UmdIsoReader(Path.of(isoPath));
                  PlaybackEngine engine = PlaybackEngine.open(iso, streamName, 0)) {
 
+                // Each stream has its own PTS timeline, so re-anchor the master
+                // clock to this stream's first audio chunk.
+                clockStartPts = -1;
+                clockStartNanos = -1;
+                clockOffsetNanos = 0;
+
                 Thread audio = startAudio(engine);
                 awaitClock();
                 long basePts = clockStartPts;