diff --git a/demos/effect/src/main/assets/media.playlist.json b/demos/effect/src/main/assets/media.playlist.json
index 63586baef8..5d03d6b5a6 100644
--- a/demos/effect/src/main/assets/media.playlist.json
+++ b/demos/effect/src/main/assets/media.playlist.json
@@ -1,9 +1,9 @@
 [
   {
-    "name": "Cats -> Dogs",
+    "name": "Dogs Short -> Dogs",
     "playlist": [
       {
-        "uri": "https://html5demos.com/assets/dizzy.mp4"
+        "uri": "https://storage.googleapis.com/exoplayer-test-media-1/mp4/android-screens-10s.mp4"
       },
       {
         "uri": "https://storage.googleapis.com/exoplayer-test-media-1/mkv/android-screens-lavf-56.36.100-aac-avc-main-1280x720.mkv"
diff --git a/demos/effect/src/main/java/androidx/media3/demo/effect/EffectActivity.kt b/demos/effect/src/main/java/androidx/media3/demo/effect/EffectActivity.kt
index e57e122b9c..ee940a67e9 100644
--- a/demos/effect/src/main/java/androidx/media3/demo/effect/EffectActivity.kt
+++ b/demos/effect/src/main/java/androidx/media3/demo/effect/EffectActivity.kt
@@ -90,6 +90,7 @@ import androidx.media3.effect.TextureOverlay
 import androidx.media3.exoplayer.ExoPlayer
 import androidx.media3.ui.PlayerView
 import com.google.common.collect.ImmutableList
+import java.util.Locale
 import kotlinx.coroutines.launch
 
 class EffectActivity : ComponentActivity() {
@@ -364,7 +365,7 @@ class EffectActivity : ComponentActivity() {
             Slider(
               value = effectControlsState.contrastValue,
               onValueChange = { newContrastValue ->
-                val newRoundedContrastValue = "%.2f".format(newContrastValue).toFloat()
+                val newRoundedContrastValue = "%.2f".format(Locale.ROOT, newContrastValue).toFloat()
                 onEffectControlsStateChange(
                   effectControlsState.copy(
                     effectsChanged = true,
@@ -437,7 +438,7 @@ class EffectActivity : ComponentActivity() {
               Slider(
                 value = effectControlsState.textOverlayAlpha,
                 onValueChange = { newAlphaValue ->
-                  val newRoundedAlphaValue = "%.2f".format(newAlphaValue).toFloat()
+                  val newRoundedAlphaValue = "%.2f".format(Locale.ROOT, newAlphaValue).toFloat()
                   onEffectControlsStateChange(
                     effectControlsState.copy(
                       effectsChanged = effectControlsState.textOverlayText != null,