ffmpeg -i 1.mp4 -an -c:v libvpx -ss 00:00:00.000 -t 00:00:00.000 -sn -vf scale=900:-1 -lag-in-frames 0 -auto-alt-ref 1 -quality best -qcomp .5  -slices 8 -crf 10 -b:v 00k -bufsize 00 -f webm -pass 1 NULL &&
ffmpeg -i 1.mp4 -an -c:v libvpx -ss 00:00:00.000 -t 00:00:00.000 -sn -vf scale=900:-1 -lag-in-frames 0 -auto-alt-ref 1 -quality best -qcomp .5  -slices 8 -crf 10 -b:v 00k -bufsize 00 -pass 2 output.webm


ffmpeg -y -ss 0 -t 6.5 -i cut.mp4 -vf fps=24,scale=500:-1:flags=lanczos,palettegen palette.png &&
ffmpeg -ss 0 -t 6.5 -i cut.mp4 -i palette.png -filter_complex "fps=24,scale=500:-1:flags=lanczos[x];[x][1:v]paletteuse" output1.gif



ffmpeg -i 1.mp4 -ss 00:00:00.0000 -t 00:00:00.000 -async 1 -c copy cut1.mp4





remove audio\\\\  -an

specify codec vp8\\\\\\  -c:v libvpx

start time and duration\\\\\ -ss 00:00:00.000 -t 00:00:30.000

use 2pass frame ahead check, unlimited\\\\ -auto-alt-ref 1 -lag-in-frames

slices\\\\\ -slices 8

disable subtitles\\\\\ -sn

scale width height\\\\\  -vf scale=-1:-1

insert metadata\\\\\  -metadata title="test"

2 lines at once

VBR\\\\  -b:v 765k -bufsize 1000 -crf 10


max size 3
bitrate = total MB * 8192 \ seconds

maxrate/bufsize = frequency of checks. Keep this frequency between 1 and 2 seconds as a rule of thumb



CROPPING    //////     -filter:v "crop=A:B:C:D"

A = width
B = height
C = starting pixels from left
D = starting pixels from top



SPEED

ffmpeg -i input.webm -c:v libvpx -filter:v "setpts=0.5*PTS" newoutput.webm

setpts = fractions for faster, whole and above for slower (0.5 is twice as fast)

Screenscapture

ffmpeg -video_size 1366x768 -framerate 25 -f x11grab -i :0.0+00,00 output.mp4