Length of a video file (.avi, .mpg) from the command line

To: debian-user@lists.debian.org
Subject: Length of a video file (.avi, .mpg) from the command line
From: Jean-Baptiste Thomas <cau2jeaf1honoq@laposte.net>
Date: Wed, 14 Aug 2019 17:43:42 +0200 (CEST)
Message-id: <[🔎] 1011692709.8442838.1565797422102.JavaMail.zimbra@laposte.net>
In-reply-to: <232650465.8441480.1565797414549.JavaMail.zimbra@laposte.net>

Can anyone recommend a command line program that could tell me
the length of the video stream in a .avi or .mpg file ? Thanks
in advance.

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Follow-Ups:
- Re: Length of a video file (.avi, .mpg) from the command line
  - From: Dan Ritter <dsr@randomstring.org>
- Re: Length of a video file (.avi, .mpg) from the command line
  - From: Andy Smith <andy@strugglers.net>
- Re: Length of a video file (.avi, .mpg) from the command line
  - From: Jonas Smedegaard <jonas@jones.dk>
- Re: Length of a video file (.avi, .mpg) from the command line
  - From: Michael Lange <klappnase@freenet.de>