[extractor/sbs] Overhaul extractor for new API (#6839)

Closes #6543
Authored by: vidiot720, dirkf, bashonly

yt_dlp/utils.py

@@ -4093,6 +4093,10 @@ def dfxp2srt(dfxp_data):
         def close(self):
             return self._out.strip()
 
+    # Fix UTF-8 encoded file wrongly marked as UTF-16. See https://github.com/yt-dlp/yt-dlp/issues/6543#issuecomment-1477169870
+    # This will not trigger false positives since only UTF-8 text is being replaced
+    dfxp_data = dfxp_data.replace(b'encoding=\'UTF-16\'', b'encoding=\'UTF-8\'')
+
     def parse_node(node):
         target = TTMLPElementParser()
         parser = xml.etree.ElementTree.XMLParser(target=target)