First there is no official and professional AV industry in any country other than Japan. The only other country I believe it is legal to produce porn is Taiwan but there is no industry mostly because of copyright laws. At most in Taiwan, the pornography production is limited to webcam shows.
That being said there are three porn produced in non-Japan Asian countries.
For most of the Asian countries, if not all, the max of their "official" porn production are webcam shows, amateur videos, and low-budget productions. Other than Hong Kong/Macau (I say this with some uncertainty) , South Korea and Taiwan, all porn production is illegal.
Korea is a little weird with their laws. Korea has Pink Cinema, Sex scenes in mainstream movies using mainstream actors/actress (they are essentially softcore porn), amateur porn, low-budget porn (often a camera on a tripod aimed at the "actor" and "actress"), and pretty much hentai (but purely on a manga setting with censorship of genitalia). Only the pink cinema, sex scenes in movie, and hentai are legal.