- Seeks by 5 seconds back / forward
- Note: Pressing these shortcuts quickly in succession while transcoding is active will throw an error since the previous request hasn't had time to finish before the next one. This bug also happens with the seek bar so might perhaps be best addressed in a separate pr / commit.
* Ctrl + Down decreases, Ctrl + Up increases in 5 % increments.
* The volume slider value gets rounded up / down to the nearest increment if it isn't exactly at one of the increments.