ffmpeg/tests/ref/fate/libavcodec-htmlsubtitles

<<hello>> --> <<hello>>
<<<b>hello</b>>> --> <<{\b1}hello{\b0}>>
< hello < 2000 > world > --> < hello < 2000 > world >
<h1>TITLE</h1> --> TITLE
< font color=red >red</font> --> {\c&HFF&}red{\c}
Foo <foo@bar.com> --> Foo <foo@bar.com>
<b> foo <I> bar </B> bla </i> --> {\b1} foo {\i1} bar {\b0} bla {\i0}
A<br>B<BR/>C<br  / >D<  Br >E<brk><brk/> --> A\NB\NC\ND\NE