Trim video using ffmpeg

It might be over-complicated in some cases to fire up a huge video editing suite just to cut a section out of a video. Trimming a video does not have to be over complicated. The most tedious step is finding … Continue reading

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Frame by frame video playback

Sometimes it can be helpful to inspect videos or sections of a video frame by frame. The simplest way to do this might be using ffplay. Although with its minimalistic user interface, the controls require getting used to. The program … Continue reading

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Verify installed rpm packages

Installing packages via rpm usually provides a lot of comfort. Simply installing an rpm deploys all files related to that package wherever they need to go across the system. Some packages distribute hundreds of files into different sections of the … Continue reading

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Setup WireGuard VPN on CentOS

WireGuard provides a modern VPN and is advertised as being much easier to install and configure than many other VPN services. Most of this simpler setup procedure comes from the fact that the cryptographic methods used are not as highly … Continue reading

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Reverse proxy with exception for Let’s Encrypt

With many services running in their own container or with their own daemon, the use of reverse proxies is getting more common, and at the same time, the use of SSL/TLS has become a standard. Let’s Encrypt is a provider … Continue reading

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Download a complete website using wget

In some rare cases you might run into the need to download a complete website onto your local machine for offline usage. There are many GUI tools to do this with loads of options. But did you know that you … Continue reading

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Setup Unifi Network Controller on a Raspberry Pi

Unifi access points from Ubiquiti cannot be configured like normal, standalone access points. They require a special network component called Unifi Controller. This controller is a piece of Software that allows configuration and monitoring of all Unifi access points within … Continue reading

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Check Certificate Chain of webserver

Changing the certificate of a webserver sometimes means also changing the intermediate certificate(s). After reloading the webserver, checking that the certificates are ok is important. Checking the webserver’s own certificate is not a problem, but checking the intermediate chain is … Continue reading

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Remove stuck emails from postfix mail queue

Sometimes mails queue up in the postfix mail queue for some reason, maybe the destination mailserver does not exist or some emails have a recipient address that is incorrect. This is generally not a problem, but sometimes, a system automation … Continue reading

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How to Recover Deleted Files on Mac

Keeping your Mac clean and free of unwanted files is essential if you want to keep it running like new. But the problem is that users sometimes tend to accidentally delete files that they need later on. Recovering them is … Continue reading

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