Increase pixel difference threshold

PiperOrigin-RevId: 467610621
(cherry picked from commit 73d606ac)

libraries/effect/src/androidTest/java/androidx/media3/effect/BitmapTestUtil.java

@@ -55,13 +55,13 @@ public class BitmapTestUtil {
    * SingleFrameGlTextureProcessors} will cause the test to fail.
    *
    * <p>To run pixel difference-based tests on physical devices, please use a value of 5f, rather
-   * than 0.1f. This higher value will ignore some very small errors, but will allow for some
+   * than 0.5f. This higher value will ignore some very small errors, but will allow for some
    * differences caused by graphics implementations to be ignored. When the difference is close to
    * the threshold, manually inspect expected/actual bitmaps to confirm failure, as it's possible
    * this is caused by a difference in the codec or graphics implementation as opposed to a {@link
    * SingleFrameGlTextureProcessor} issue.
    */
-  public static final float MAXIMUM_AVERAGE_PIXEL_ABSOLUTE_DIFFERENCE = 0.1f;
+  public static final float MAXIMUM_AVERAGE_PIXEL_ABSOLUTE_DIFFERENCE = 0.5f;
 
   /**
    * Reads a bitmap from the specified asset location.