The behaviour is different in unity7 and gnome-shell. In unity7 screen
blanking is disabled during video playback. Tested on the same machine
with same settings.

On unity7 I did the following test:
1. Set screen blanking to 2 min
2. Wait 2 min with nothing playing
  -> The display goes black after 2 min
3. Play a netflix video in Chrome 
  -> The display does not go black after 2 min

** Also affects: gnome-shell (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1697373

Title:
  Do not dim/lock the screen when a video is playing

Status in chromium-browser package in Ubuntu:
  New
Status in gnome-shell package in Ubuntu:
  New

Bug description:
  Test Case:
  1. Launch netflix in chrome
  2. Play a video
  3. Wait until the display times out.

  Expected result
  The screen does not dim

  Actual result
  The display goes black.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: gnome-shell 3.24.2-0ubuntu6
  ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15
  Uname: Linux 4.10.0-22-generic x86_64
  ApportVersion: 2.20.5-0ubuntu4
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Mon Jun 12 09:21:46 2017
  DisplayManager: gdm3
  InstallationDate: Installed on 2013-09-03 (1377 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130902)
  ProcEnviron:
   TERM=screen-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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