Error 0 : Input is Null?

[Beardless2]

I am getting a "Error 0 : Input is Null" error when calling the libvlc_video_take_snapshot procedure, is there a function a can call before that to see if my input is not null?

I have tried libvlc_media_player_has_vout and libvlc_media_player_get_state but neither of these seemed to work