Public bug reported:
By defaut vlc uses Automatic for hardware accelerated decoding. On an nvidia
optimus machine where nvidia drivers are not installed vlc picks vdpau instead
of one of the vaapi outs. The result is very poor playback, at least with h264.
Attached message log from vlc at fresh install defaults & one with the hwdec
changed to one of the vaapi choices, this case x11
Notable -
Default (playback is terrible, large # dropped frames
avcodec debug: available hardware decoder output format 109 (vdpau)
avcodec debug: available hardware decoder output format 53 (vaapi_vld)
avcodec debug: available software decoder output format 0 (yuv420p)
core debug: looking for hw decoder module matching "any": 4 candidates
core debug: using hw decoder module "vdpau_avcodec"
Specified (playback is fine
avcodec debug: available hardware decoder output format 109 (vdpau)
avcodec debug: available hardware decoder output format 53 (vaapi_vld)
avcodec debug: available software decoder output format 0 (yuv420p)
core debug: looking for hw decoder module matching "vaapi_x11": 4 candidates
core debug: using hw decoder module "vaapi_x11"
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: vlc 2.2.1-5 [modified: usr/share/applications/vlc.desktop]
ProcVersionSignature: Ubuntu 4.3.0-5.16-generic 4.3.3
Uname: Linux 4.3.0-5-generic x86_64
ApportVersion: 2.19.3-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Jan 20 01:05:02 2016
InstallationDate: Installed on 2016-01-14 (5 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160114)
SourcePackage: vlc
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: vlc (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug third-party-packages xenial
** Attachment added: "default.log"
https://bugs.launchpad.net/bugs/1536010/+attachment/4553104/+files/default.log
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https://bugs.launchpad.net/bugs/1536010
Title:
"Auto" hwdec uses wrong hw decoder module on optimus machines
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