A specially developed version of Linux will replace Windows 7 in the Chinese public sector. CNews article.

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Most smartphones in video cameras record a video with a constant frame rate - 30 or 60 frames per second.
However, in the GCam application when shooting at night, you can set the frame rate automatically - it drops to 14 and below when there is not enough light, but the image in the frame becomes brighter. Recording with a variable frame rate (VFR) must be re-encoded with a constant frame rate (CFR) of 30 fps.

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Various public services portals accept files in electronic form of a strictly limited size. The usual requirement is a file size less than 5 MB. But many PDF files have a larger size due to the fact that the PDF format has recently been used for storing scanned documents. This message shows two ways to reduce the size of PDF files.

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The FT8 digital mode has gained incredible popularity and recognition around the world. Radio amateurs want to use it not only for long-distance DX QSOs on short waves, but also in competitions, including on ultra-short waves 144 and 432 MHz. The WSJT-X program provides an operating mode for European competitions using FT8 modulation.

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When the RAM runs out, the computer becomes very slow as it accesses the swap file on the hard drive. To solve this problem, the zswap module was invented. By default, it is disabled in the Linux operating system, but you can enable it.

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For diagnostic purposes, I have boot-time messages enabled in /etc/default/grub (line GRUB_CMDLINE_LINUX=""
).
When starting a computer running Linux Mint 19.2, errors like FAILED Failed to start AppArmor are visible. The problem started after reinstalling the MySQL service to manage relational databases. The solution to the "Failed to start AppArmor" problem is given below...

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In a TP-Link network router ("router") with OpenWrt firmware, it was necessary to block the MAC address of the network device on the local network so that the device would not have access to the Internet.

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Task: upload photos via Wi-Fi from a smartphone to a personal computer running Linux.

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In a large network with DHCP enabled, intrusions sometimes occur - third-party connections.
They need to be tracked. It is convenient to take pictures of the network - before and after.
In the article I talk about two ways to compile a list of computers (a network snapshot) - using nmap and arp-scan.

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To search for rare countries or simply monitor activity on bands, DX clusters operating via the Telnet protocol are traditionally used. The advantage is low traffic consumption and low system requirements. The disadvantage is control using console commands and the lack of a graphical user interface. I found a successful solution that combines the advantages of a Telnet cluster and a graphical shell - a program from VE7CC.

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