Mese: Febbraio 2022

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how to merge video files

Two ways:

1) via terminal

you can use this code 

mkvmerge -o outfile.mkv infile_01.mp4 \+ infile_02.mp4 \+ infile_03.mp4

2) graphically

by using f.e. Avidemux:

  • open the first video file
  • go to the end of that file
  • append the second, and go to the end
  • then append all other possible video files
  • if you plan to merge several video (such as several films), you can queue instead of save (immediately) the files
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ssd slow (in Linux)

If your SSD has become slow, it could depend from the swap file: f.e. in fstab the ssd swap UUID could be wrong (after some partitions changes in your SSD).

You can fix this by giving to the swap partition the correct UUID.

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regex multiple replacements

You could have to replace several “whatever”, f.e. in a sql file I had to replace many columns with dates, such as ‘2005-08-15’ splitting them in ‘2005’, ’08’, ’15’.

I manage to do it with this code: 

find NULL, '(.*?)-(.*?)-(.*?)', NULL, NULL, NULL
replace NULL, '\1', '\2', '\3', NULL

In this way you can replace '2005-08-15', NULL, NULL, NULL with '2005', '08', '15', NULL, and likewise all the like, such as '2012-06-23', NULL, NULL, NULL with '2012', '06', '23', NULL and so on.

But, be careful: make a backup of your file before.

another case: if you want replace several digits with the same digits formatted, you can try something like this code:

search: ^    (\d{2})$
replace: <h2>cap. \1</h2>\n