Add only supported MdtaMetadataEntry

PiperOrigin-RevId: 536351494
(cherry picked from commit ba8b9d13d0f1e6cce16a4ff5ea9271f7dd5a9e36)

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/InAppMuxer.java

@@ -181,7 +181,9 @@ public final class InAppMuxer implements Muxer {
       // LINT.IfChange(added_metadata)
       if (entry instanceof Mp4LocationData
           || entry instanceof XmpData
-          || entry instanceof MdtaMetadataEntry) {
+          || (entry instanceof MdtaMetadataEntry
+              && ((MdtaMetadataEntry) entry)
+                  .key.equals(MdtaMetadataEntry.KEY_ANDROID_CAPTURE_FPS))) {
         metadataEntries.add(entry);
       }
     }