Index: wp-includes/ID3/module.audio-video.quicktime.php
===================================================================
--- wp-includes/ID3/module.audio-video.quicktime.php	(revision 55130)
+++ wp-includes/ID3/module.audio-video.quicktime.php	(working copy)
@@ -1484,7 +1484,6 @@
 					}
 					if (substr($atom_data, $mdat_offset, 4) == 'GPRO') {
 						$GOPRO_chunk_length = getid3_lib::LittleEndian2Int(substr($atom_data, $mdat_offset + 4, 4));
-						$GOPRO_offset = 8;
 						$atom_structure['GPRO']['raw'] = substr($atom_data, $mdat_offset + 8, $GOPRO_chunk_length - 8);
 						$atom_structure['GPRO']['firmware'] = substr($atom_structure['GPRO']['raw'],  0, 15);
 						$atom_structure['GPRO']['unknown1'] = substr($atom_structure['GPRO']['raw'], 15, 16);
@@ -2021,8 +2020,6 @@
 
 				case 'chpl': // CHaPter List
 					// https://www.adobe.com/content/dam/Adobe/en/devnet/flv/pdfs/video_file_format_spec_v10.pdf
-					$chpl_version = getid3_lib::BigEndian2Int(substr($atom_data, 4, 1)); // Expected to be 0
-					$chpl_flags   = getid3_lib::BigEndian2Int(substr($atom_data, 5, 3)); // Reserved, set to 0
 					$chpl_count   = getid3_lib::BigEndian2Int(substr($atom_data, 8, 1));
 					$chpl_offset = 9;
 					for ($i = 0; $i < $chpl_count; $i++) {
Index: wp-includes/ID3/module.tag.lyrics3.php
===================================================================
--- wp-includes/ID3/module.tag.lyrics3.php	(revision 55130)
+++ wp-includes/ID3/module.tag.lyrics3.php	(working copy)
@@ -39,7 +39,6 @@
 		$lyrics3_id3v1 = $this->fread(128 + 9 + 6);
 		$lyrics3lsz    = (int) substr($lyrics3_id3v1, 0, 6); // Lyrics3size
 		$lyrics3end    = substr($lyrics3_id3v1,  6,   9); // LYRICSEND or LYRICS200
-		$id3v1tag      = substr($lyrics3_id3v1, 15, 128); // ID3v1
 
 		if ($lyrics3end == 'LYRICSEND') {
 			// Lyrics3v1, ID3v1, no APE