Despite visual similarity "þ" is unrelated to "p". It is normally transliterated as "th": $ echo þ-Þ | iconv -t ASCII//TRANSLIT th-TH
b836118724
This fixes handling of non-UTF8 TTML subtitles Closes #14191
Used in Youku Show pages
Seen at http://zaq1.pl/video/xev0e
Used in daisuki.net (#4738)