Videos
ffmpeg
Inspect video
ffmpeg -i <input>
Converting MPEG2 video to H265
For old MPEG2 videos it is often just enough to recode them with automatic bitrate to lower the file size
ffmpeg -i <input>.MPG -acodec aac -vcodec libx265 <output>.mp4
H265 2-pass encoding
For H265 2-pass encoding you need to combine 2 ffmpeg calls. Example from ffmpeg:
ffmpeg -y -i input -c:v libx265 -b:v 2600k -x265-params pass=1 -an -f mp4 /dev/null && \
ffmpeg -i input -c:v libx265 -b:v 2600k -x265-params pass=2 -c:a aac -b:a 128k output.mp4
Fixing rotation
Do not recode for rotation but simple add a video metadate field for the rotation angle
ffmpeg -i <input> -c copy -metadata:s:v:0 rotate=90 <output>