Im thinking of starting speedrunning gta iv ,is the community active?

Yes.

Also I seem to have a problem with livesplit ,it won't auto start

Makes sure to join the GTA Speedrunning Discord server and ask questions there.

Harbinger66 I don't know if you are having the same problem as me but I go on windowed screen to fix my livesplit on gta4

thanks it works in windowed screen