cloud engineer
Here’s how to resize videos and pictures using FFMPEG.
Bulk Resize Pictures
for filename in *.JPG; do ffmpeg -i "$filename" -vf scale=-1:720 final/"$filename"; done |
for filename in *.JPG; do ffmpeg -i "$filename" -vf scale=-1:720 final/"$filename"; done
Bulk Resize Video and Create Thumbnail
for filename in *.MP4; do ffmpeg -i "$filename" -s 1080x720 -pix_fmt yuv420p -crf 18 "$filename".mp4; ffmpeg -ss 00:00:00 -i "$filename" -vframes 1 "$filename".jpg; done |
for filename in *.MP4; do ffmpeg -i "$filename" -s 1080x720 -pix_fmt yuv420p -crf 18 "$filename".mp4; ffmpeg -ss 00:00:00 -i "$filename" -vframes 1 "$filename".jpg; done
Almost all are not able to remember all the shortcuts that are available for the vi or vim editor. I will call it vim throughout this article. There are several cheatsheets out there, but the one that works for me is the one provided by rtorr in Github. I use the cheatsheet often. I suggest that you start small. At the very least learn how to navigate in vim. Once you feel comfortable doing that, you can learn other advanced shortcuts such as editing, search and replace, working with multiple files and many much more. I hope you’ll find the cheatsheet as helpful as it has done for me. Again if you missed the link above, I posted it below.
How to resize JPEG using FFMPEG.
ffmpeg -i TREE.JPG -y -vf scale=iw*.2:ih*.2 tree.jpg |
ffmpeg -i TREE.JPG -y -vf scale=iw*.2:ih*.2 tree.jpg
Another option is to set resolution.
ffmpeg -i TREE.JPG -y -vf scale=-1:720 tree.jpg |
ffmpeg -i TREE.JPG -y -vf scale=-1:720 tree.jpg
How to resize video using FFMPEG.
ffmpeg -i TREE.MP4 -s 640x360 -pix_fmt yuv420p -crf 18 tree.mp4 |
ffmpeg -i TREE.MP4 -s 640x360 -pix_fmt yuv420p -crf 18 tree.mp4
How to create a thumbnail from a video.
ffmpeg -ss 00:00:00 -i tree.mp4 -vframes 1 tree.jpg |
ffmpeg -ss 00:00:00 -i tree.mp4 -vframes 1 tree.jpg
I had trouble getting my vi editor to display all black background color. This includes the background color after the end of the file. I just wanted an all black background for better visibility. I did a little bit of googling and found this nice little gem. I happen to like the dessert theme and went with that instead of the recommended mustang theme which I don’t have installed. Hope you’ll find this helpful.
set t_Co=256 set background=dark colorscheme dessert highlight Normal ctermbg=NONE highlight nonText ctermbg=NONE |
set t_Co=256 set background=dark colorscheme dessert highlight Normal ctermbg=NONE highlight nonText ctermbg=NONE
If you need to remove files from a repo after committing, use …
Remove file
git rm --cached file.ext |
git rm --cached file.ext
Push to repo
git push |
git push
Cockpit is a web-based graphical interface for Linux users and admins.
Install
dnf install cockpit |
dnf install cockpit
Start and Enable
systemctl start cockpit
systemctl enable cockpit.socket |
systemctl start cockpit systemctl enable cockpit.socket
Status
systemctl status cockpit |
systemctl status cockpit
Web access
http://192.168.0.20:9090 |
http://192.168.0.20:9090