Rotate a video with FFmpeg (100% lossless, and quick)

rotate-video.sh

$INPUTVIDEO='input.mp4'
$OUTPUTVIDEO='output.mp4'
ffmpeg -i $INPUTVIDEO -metadata:s:v rotate="-90" -codec copy $OUTPUTVIDEO

A little overkill; but I've made a 'shortcut' for the above; whereas you only have to call the script and specify the file in an argument.

Example usage:
rotate90 myVideo.MP4

• The shortcut can be called from anywhere
• Saves output to the current working folder
  (using the example above: from myVideo.MP4 -> myVideo+90.MP4)

In order to be able to use the above 'shortcut':

Copy, paste and run the following within your terminal (once):

### [COPY & PASTE all the contents below into Linux (Debian) cmd] ###


# update repositories & packages

sudo apt-get update -y
sudo apt-get upgrade -y


# install ffmeg

sudo apt install ffmpeg -y


# create a shortcut script for video rotation

SDir=/home/$USER/scripts/
mkdir -p "$SDir"

EOF				
cat << "EOF" >  ${SDir}rotate90
INPUTVIDEO="$1"
OUTPUTVIDEO="${INPUTVIDEO%.*}+90.MP4"

ffmpeg -i "$INPUTVIDEO" -metadata:s:v rotate="90" -codec copy "$OUTPUTVIDEO"
EOF

chmod 750 -R "$SDir"


# update ~/.bashrc (to be able to call the script from anywhere without having to use "./" as prefix or need full PATH)

echo -e 'export PATH=$PATH:/home/'"$USER/scripts" >> ~/.bashrc

To change the rotation angle edit the script /home/$USER/rotate90 4th line variable rotate="90"'s value to the desired one.
( ex.: -270; -90; 180; ... )

rotate90ALL:

for file in ./*.MP4

do
    rotate90 "$file"
done

I was too lazy to copy the already rotated files to a new folder;

• so I've modified the above script to ignore these files (and automatically skip asking me if I want to overwrite each already rotated file...).

while true; do echo no; done | for file in $(ls | grep -i ".MP4" | grep -v "+90"); do rotate90 "$file"; done