Supported Input subtitles :

Supported Subtitle Examples :	Non Supported Subtitle Examples :
Txt(Microdvd format up to two subtitles per line). {1}{1}25.000 {1215}{1315}Hi There ! {2053}{2091}Still Here ?| -Yes !. {2215}{2315}Welcome home ! ...	No srt with color tags 1 00:03:05,042 --> 00:03:07,520 <font color="#ffffff">Hi !</font> 2 00:03:07,881 --> 00:03:12,557 <font color="#ffffff">E?</font> <font color="#ffffff">-Yes!</font> ...
Srt(Subrip format up to two subtitles per line). 1 00:02:36,280 --> 00:02:39,556 Hi There ! 2 00:02:43,800 --> 00:02:45,233 Still Here ? -Yes !. ...	No srt with three or more subtitles per line. 1 00:02:36,280 --> 00:02:39,556 Hi There ! 2 00:02:43,800 --> 00:02:45,233 Still Here ? -Yes !. -Well bye !!! ...
Yes srt with special tags. 1 00:02:36,280 --> 00:02:39,556 Hi <U>There</U> ! 2 00:02:43,800 --> 00:02:45,233 Still <B>There</B> ! <I>Yes</I> !. ...
Srt with coordinates. 1 00:03:05,042 --> 00:03:07,520 X1:000 X2:000 Y1:000 Y2:000 Hi There ! 2 00:03:07,881 --> 00:03:12,557 X1:000 X2:000 Y1:000 Y2:000 Still Here ? -Yes ! ...

*The tags <B>,<I>,<U> are simply ignored by the render motor of Txt2Sup.
** The coordinates of the srt are simply ignored. (The placement of the subtitles is defined by offest,offsetor,align)

Txt2Sup from the version 42.11 supports unicode.
Generally multilanguage text files can be :

ANSI (Txt2Sup supports them under Windows)
UNICODE - UTF8 (Txt2Sup does NOT support them)
UNICODE - UTF8 with BOM (Txt2Sup supports them under Windows and Linux).

For more informations see the official documentation page