Measures on the command line

In an earlier article I promised to demonstrate more 'magic words' for the command line. All you do is open a terminal, enter the magic word, hit Enter – and cool things happen! The magic word this time is units. The GNU Units program isn't installed by default in most Linux distributions, so you'll probably need to install it from your distribution's repository. Also, until you get to know GNU Units, I recommend that you enter units -v (v for verbose) on the command line. This makes the output a little more easy to understand.

The GNU Units program converts quantities from one unit system to another.

Video Conversion System Implementation

Many systems support video upload and viewing functionality. Of course, all video files uploaded by users shall be converted to some common format (flv format as usual) to make playback easier, probably scaled to common resolution, or watermarks are required on the site, etc. Therefore, developers have to solve the problem of video conversion very often and use various approaches.

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