3D sound rolloff volume not working


I’m trying to use movietexture on a plane, i have a .ogv video(v codec theora, a codec vorbis) im loading it from Resources folder and assigning its audioclip to audiosource. Its playing normally with audio but volume is not changing according to distance. (when i use any other audio clip for the audiosource of the movietexture its working).

Anyone has any idea?

Thanks in advance…

I wrote my own 3D distance volume.
Pls try my script