This script redudes the size of a video file by transcoding it from x264 to x265 video and increasing the CRF value to 28 following the method found in this Stackoverflow thread.
This script requires ffmpeg to be installed.
Run the script ./shrinker.sh and make sure to pass the input and output file as an argument like this: ./shrinker.sh input output.
Should anyone experience issues while launching the script do not forget to make it executable using chmod a+x shrinker.sh before executing the script.