Ok found root cause and also other bugs (Windows version):
- when subs are on more lines than only one, last char is replaced with "\N" so last char is missing!
- when SRT subs are ANSI, your ASS file is ANSI ==> PMS renders them OK and in 3D
- when SRT subs are UTF-8, your ASS file is ANSI ==> subs are with corrupted diactrics and PMS wrongly decodes Codepage ===> see result:
When PMS loads ANSI subs it adds "-subcp CP1250" for subtitles. When subs are UTF-8, instead of "subcp CPxxxx" it adds "-utf8"
When subs are in other format than MEncoder parameter specifies, you will see corrupted diactrics and 2D subs (doubled under each other) with about 5 secs delay
So mistery resolved
Many thanks for fix