Thanks a lot for answering. However, from what I can see in libvlc_media_player.h, libvlc_adjust_Enable is declared as : /** option values for libvlc_video_{get,set}_adjust_{int,float,bool} */ enum libvlc_video_adjust_option_t { libvlc_adjust_Enable = 0, libvlc_adjust_Contrast, libvlc_adjust_Brightn...