Supported input video formats :
Most avi files are suported. AviSub supports all the avi files that are supported by divxmux (made by the divx networks).
If you have problems by muxing the subtitles then take a look at the dedicated AviSub forum in order to find support.

Supported Input subtitles :
AviSub support srt/txt textual subtitles as input. It also supports visual vobsubs (idx/sub).

Supported Subtitle Examples :	Non Supported Subtitle Examples :
Sub/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 ! ...