behaviour of srt with avi vs. dvd

[flannob]

Greetings
when I play avi+srt, when the srt has <i> </i> intervals, I get italics on screen.
but when I try to create a dvd (using tmpgenc) the italics property was lost,
i.e. the subtitle was displayed with <i> etc.
How can I display italics when converting to dvd?
thanks

[Case]

SubRip (.srt) was originally developed to be without styling. Some players decode styling in it anyway, but many do not.
To be safe, and standard compliant, use a subtitle format that supports styling, e.g. SAMI (.smi), SubStation Alpha (.ssa) or Advanced SubStation Alpha (.ass), whichever your encoder supports.