On the computer target behind a firewall, in which you want to login in the
future, do
ssh -f -N -R 0.0.0.0:19999:localhost:22 user@server
server need to be reachable and needs to have the following option
set in /etc/ssh/sshd_config
GatewayPorts yes
Now any client can reach target with
ssh -p 19999 user@server
This can also used for, e.g., sshfs
sshfs -p 19999 user@server:folder ~/sshfs
Convert a folder of .png into an animated .gif.
convert -delay 30 -loop 0 -layers Optimize *.png out.gif
Naturally, this works not olny for .png and all other options of
Imagemagick can be used as well.
convert -resize 256x256\> -delay 30 -loop 0 -layers Optimize *.svg out.gif
Convert a folder of .png files into a weboptimized VP9, which is supported
by all important Browsers.
ffmpeg -f image2 -pattern_type glob -i "img*.png" -c:v libvpx-vp9 -pass 1 \
-b:v 1000K -threads 1 -speed 4 -tile-columns 0 -frame-parallel 0 \
-auto-alt-ref 1 -lag-in-frames 25 -g 9999 -aq-mode 0 -an -f null -
ffmpeg -f image2 -pattern_type glob -i "img*.png" -c:v libvpx-vp9 -pass 2 \
-b:v 1000K -threads 1 -speed 0 -tile-columns 0 -frame-parallel 0 \
-auto-alt-ref 1 -lag-in-frames 25 -g 9999 -aq-mode 0 -c:a libopus -b:a 64k \
-f webm video.webm
For maximum compatibility create a MP4 as fallback.
ffmpeg -an -f image2 -pattern_type glob -i "img*.png" -vcodec libx264 \
-pix_fmt yuv420p -profile:v baseline -level 3 video.mp4
Embed with:
<video>
<source src="path/to/video.webm" type="video/webm; codecs=vp9,vorbis">
<source src="path/to/video.mp4" type="video/mp4">
</video>