{"video_device_number","set video device number for devices with same name (starts at 0)",OFFSET(video_device_number),AV_OPT_TYPE_INT,{.dbl=0},0,INT_MAX,DEC},
{"audio_device_number","set audio device number for devices with same name (starts at 0)",OFFSET(audio_device_number),AV_OPT_TYPE_INT,{.dbl=0},0,INT_MAX,DEC},