Converting video in Linux system from a smartphone to save space is very easy with ffmpeg:ffmpeg -i input.mp4 -c:v libx265 -crf 28 -preset medium -c:a aac -b:a 128k output.mp4
If you would like to additionally rotate the video clockwise you need to add -vf "transpose=1", so:
ffmpeg -i input.mp4 -c:v libx265 -crf 28 -preset medium -c:a aac -b:a 128k -vf "transpose=1"output.mp4
Counter clockwise is -vf "transpose=2"
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