I know... there are a lot of questions out there already about reducing the file size with ffmpeg.
But, here's why my question is a bit different, it addresses having difficult content. I think that there's an issue with the significant area of moving sea water in my source video.
From an h624 video off the phone at 35MB, I got a 'compressed' video of 60MB, with
ffmpeg -i water.mp4 -vcodec libx265 -crf 28 small_water.mp4
An even simpler example also produced a much larger output.
ffmpeg -i water.mp4 new_water.mp4
So my question is, what do you do when the video contains a significant amount of fast moving background artefacts? Normal methods do not seem to reduce the size, but I'm assuming, there must be something that works. I suppose it's a similar problem to one with video of F1 racing where the video pans across the spectators while following the cars.
Background; I was converting several phone videos to h625 to shrink them for posting on Whatsapp, all the others shrank as expected, except the 'water' one which doubled in size. So more out of interest for future reference, I'd like to know if there's a solution.
