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Asked: 2020-08-29 11:50:11 +0800 CST

How to know library version?

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Suppose I was told, that libx265-dev version should be ≥ 68.

I have

$ sudo apt list libx265-dev
Listing... Done
libx265-dev/bionic,now 2.6-3 amd64 [installed]

where 2.6-3 looks completely uncomparable with 68.

How to know if it is greater or not?

Here is an example of such a requirement, fmpeg building manual, section libx265.

apt versions libraries 18.04

3 Answers

  1. In a terminal enter:

    apt depends libx265-dev

    You should see something like:

    libx265-dev
  Depends: libx265-179 (= 3.2.1-1build1)
  Suggests: libx265-doc

    The number after Depends: libx265- is the version number which should be ≥ 68.

    • 3

  2. The libx265-dev package is in the default repositories of Ubuntu 16.04 and later (at least until Ubuntu 22.10). In Ubuntu 18.04 open the terminal and type:

    apt-cache show libx265-dev | grep Depends

    Results:

    Depends: libx265-146 (= 2.6-3)

    libx265-dev version in Ubuntu 18.04 is 146 which is ≥ 68.

    • 3

  3. I assume you require H.265/HEVC video stream encoder (development files)
    and the libx265-dev_2.6-3_amd64 is the latest stable version.
    To make sure you are up to date, open a terminal and type
    sudo apt-get update && sudo apt-get install libx265-dev

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