Test: Trim 4k60 test file to 300ms.

This was trimmed using the Transformer Demo, from ~4 seconds to 300ms

Otherwise, this test file will be quite large, and folks who clone the repo will
have to clone this content as well. Trimming the file also allows the test to
take less time, while still testing the core purpose of the file, to confirm that 4k extraction/decode/GL/encode/muxing works.

PiperOrigin-RevId: 517408463

libraries/transformer/src/androidTest/java/androidx/media3/transformer/AndroidTestUtil.java

@@ -141,7 +141,7 @@ public final class AndroidTestUtil {
           .setSampleMimeType(VIDEO_H264)
           .setWidth(3840)
           .setHeight(2160)
-          .setFrameRate(57.39f)
+          .setFrameRate(60.00f)
           .setCodecs("avc1.640033")
           .build();