The previous code led me to misread this stack trace as a null pointer
exception, but it's really an index out of bounds exception:
```
Caused by: androidx.media3.exoplayer.upstream.Loader$UnexpectedLoaderException: Unexpected IllegalArgumentException: null
at androidx.media3.exoplayer.upstream.Loader$LoadTask.run(Loader.java:435)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
at java.lang.Thread.run(Thread.java:1012)
Caused by: java.lang.IllegalArgumentException
at androidx.media3.common.util.Assertions.checkArgument(Assertions.java:40)
at androidx.media3.common.util.ParsableByteArray.setPosition(ParsableByteArray.java:164)
at androidx.media3.extractor.text.cea.Cea608Parser.parse(Cea608Parser.java:440)
```
PiperOrigin-RevId: 592876546