warning: associated items `new`, `input_device_name`, `input_device_names`, `frames_per_second`, and `set_frames_per_second` are never used
   --> src/media/io.rs:913:12
    |
909 | impl VideoInput {
    | --------------- associated items in this implementation
...
913 |     pub fn new() -> VideoInput {
    |            ^^^
...
931 |     pub fn input_device_name(&self) -> String {
    |            ^^^^^^^^^^^^^^^^^
...
935 |     pub fn input_device_names(&self) -> Vec<String> {
    |            ^^^^^^^^^^^^^^^^^^
...
949 |     pub fn frames_per_second(&self) -> u32 {
    |            ^^^^^^^^^^^^^^^^^
...
953 |     pub fn set_frames_per_second(&mut self, desired_fps: u32) {
    |            ^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(dead_code)]` on by default