Extractor#sniff() javadoc says: "If true is returned, the input's reading position may have been modified. Otherwise, only its peek position may have been modified." https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/extractor/Extractor.html#sniff-com.google.android.exoplayer2.extractor.ExtractorInput- PiperOrigin-RevId: 314296922
