find . -type f -size -50M \( -name "*.mp4" -o -name "*.mkv" -o -name "*.mov" -o -name "*.avi" -o -name "*.wmv" \)
find . -type f -size -50M \( -name "*.mp4" -o -name "*.mkv" -o -name "*.mov" -o -name "*.avi" -o -name "*.wmv" \) -delete
find . -type f -size -50M \( -name "*.mp4" -o -name "*.mkv" -o -name "*.mov" -o -name "*.avi" -o -name "*.wmv" \) -ok rm {} \;
find . -type f -size -50M \( -iname "*.jpg" -o -iname "*.jpeg" -o -iname "*.png" -o -iname "*.gif" -o -iname "*.webp" -o -iname "*.bmp" \) -delete
find . -type d -empty -delete