pixel format, fixes thumbnail and works on android:
ffmpeg -i a.mp4 -pix_fmt yuv420p b.mp4
loop:
ffmpeg -stream_loop 42 -i a.mp4 b.mp4
scale:
ffmpeg -i a.mp4 -vf scale=-1:480 b.mp4
trim:
ffmpeg -i a.mp4 -ss 0:03 -to 0:14 b.mp4
don't re-encode:
... -c copy b.mp4
from image sequence:
ffmpeg -framerate 30 -start_number 1 -i a/image%03d.png -vframes 123 b.mp4
grep -rnHIFi "words"
r: recursive
n: line number
H: filename
I: ignore binaries
F: fixed string instead of regex
i: ignore case
ls -hAgo
h: human readable sizes
A: hidden files except . and ..
g: hide owner (otherwise like l)
o: hide group (equiv to G)
R: recursive
t: sort by newest first
compress: tar -caf foo.tar.xz bar.txt
extract : tar -xaf foo.tar.xz
c: create archive
x: extract archive
a: auto detect compression type from filename
f: select file(s)
list explicit packages (not dependencies):
pacman -Qqe
sync repos:
pacman -Syy
update:
pacman -Syu
remove package and dependencies:
pacman -Rs electron
install packages without reinstalling anything:
pacman -S --needed a b c d