../
linux spellbook

# convert video with ffmpeg ----------------------

ffmpeg -i my_video.mkv -c:v copy output.mp4



# convert pdf to image ---------------------------

pdftoppm -png pdf_filename image_name



# convert wav to mp3

ffmpeg -i input.wav -acodec libmp3lame output.mp3



# batch covert images to png ---------------------

for file in *.webp; do ffmpeg -i "$file" "${file%.webp}.png"; done



# print the size of a folder ---------------------

du -sh /path/to/folder/



# create a bootable usb stick --------------------

# find your usb stick

sudo fdisk -l

# use the dd command to write to the disk

sudo dd bs=4M if=/path/to/file.iso of=/path/to/usb status=progress oflag=sync