Well, I think komik jepang wouldn'd be on a DVD. That would most likely be anime. Did it say "Manga" and have a black plus sign on it? If so, that's the logo for a dubbing company.
i think i get what your asking. are anda saying can komik jepang be in video's? well in that case if anda have a NEW komik jepang with no anime to it yet (Rin-ne for example) then some people upload pages of the komik jepang on youtube. but komik jepang is USUALLY in comic form. one of my friends told me that the japanese word for comic is manga. :)
Ummm... komik jepang is a Japanese comic .. If u've seen DVD's like komik jepang , then it is possibly there for anda to watch the komik jepang ... Because komik jepang is for reading, Some people may be comfortable oleh watching it and membaca it , atau some just oleh membaca it online atau buying it ....DVD = If u've seen it in colour .. Then it's anime .. if not if u've seen it greyscale and with words in a video .. then it is because it is easier without turning pages atau so ..... I know the reason ur confused .. But if u don't get it , Don't hesitate to ask me .. =D