[Bug 1654480] [NEW] HTML5 sound choppy when played at 4x

[Alex Korchemniy]

Public bug reported:

I use a bookmarklet to set the playback rate on the HTML5 player element
to 4x (tested with YouTube). Chrome handles the audio flawlessly, but
Firefox becomes choppy after 2x.

Here's the bookmarklet. The following line may get mangled or removed...
"javascript:%7Bvar%20v%3Ddocument.getElementsByTagName(%22video%22)%5B0%5D%3Bv.playbackRate%3D4%3B%7Dvoid(0)%3B"

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 50.1.0+build2-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35
Uname: Linux 4.4.0-57-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: amd64
BuildID: 20161209095719
Channel: Unavailable
CurrentDesktop: GNOME
Date: Thu Jan  5 20:28:52 2017
Extensions: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
InstallationDate: Installed on 2016-12-21 (16 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
IpRoute:
 default via 192.168.0.1 dev enp9s0  proto static  metric 100 
 169.254.0.0/16 dev enp9s0  scope link  metric 1000 
 172.17.0.0/16 dev docker0  proto kernel  scope link  src 172.17.0.1 linkdown 
 192.168.0.0/24 dev enp9s0  proto kernel  scope link  src 192.168.0.108  metric 100
Locales: extensions.sqlite corrupt or missing
Plugins:
 Gnome Shell Integration - /usr/lib/mozilla/plugins/libgnome-shell-browser-plugin.so (gnome-shell)
 Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
PrefSources: prefs.js
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
Profiles: Profile0 (Default) - LastVersion=50.1.0/20161209095719 (In use)
RelatedPackageVersions: gnome-shell 3.18.5-0ubuntu0.2
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/11/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.40
dmi.board.asset.tag: Default string
dmi.board.name: X99A GODLIKE GAMING (MS-7883)
dmi.board.vendor: MSI
dmi.board.version: 1.0
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.40:bd04/11/2016:svnMSI:pnMS-7883:pvr1.0:rvnMSI:rnX99AGODLIKEGAMING(MS-7883):rvr1.0:cvnMSI:ct3:cvr1.0:
dmi.product.name: MS-7883
dmi.product.version: 1.0
dmi.sys.vendor: MSI

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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Title:
  HTML5 sound choppy when played at 4x

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