This is a video recorded along the Seto inland sea of the electrified section on the Yosan Line, I think somewhere between Takamatsu and Tadotsu considering the Shiokaze and Ishizuchi is coupled although I can't find the exact location:
This video is recorded in and around Shimonada station and at some neighbouring stations on the non-electrified section of the Yosan Line, also along the Seto inland sea: