Commands I use regularly.
# Open
f = open('data.json')
data = json.load(f)
# Save
with open(<path>, 'w') as f:
json.dump(<dict>, f, indent=4, sort_keys=True)cv2.imshow("window name", image)
cv2.waitKey(0)
cv2.destroyAllWindows()ffmpeg -i s1v1.avi %06d.png
# Vice versa
ffmpeg -i %06d.png output.mp4
# If the filenames don't begin with 0 or have missing indices
ffmpeg -framerate 5 -pattern_type glob -i '*.png' out.mp4ffmpeg -ss 0 -t 15 -i squats_feedback.mp4 -acodec copy -vcodec copy side_view.mp4# out_w is the width of the output rectangle
# out_h is the height of the output rectangle
# x and y specify the top left corner of the output rectangle
ffmpeg -i in.mp4 -filter:v "crop=out_w:out_h:x:y" out.mp4
ffmpeg -i %06d.png -c:v copy -pix_fmt yuv420p out.mp4"{:04d}.png".format(counter)cd /
ncdu -x / cd /tmp/
pwd
sudo rm -r *sudo journalctl --vacuum-size=100M
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