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Thread: i5-2520M (Sandy Bridge) using GPU acceleration makes 1080p a lot worse

  1. #1
    Join Date
    Feb 2010
    Posts
    8

    Default i5-2520M (Sandy Bridge) using GPU acceleration makes 1080p a lot worse

    I am using Arch Linux, and if the switch "Use GPU acceleration (experimental)" in VLC Input & Codecs part is off then a H.264 1080p MKV plays at around 40% CPU. Not too bad. But I would prefer less CPU so I switch on GPU acceleration. As verified by looking at vlc -vv output I see vaapi used now (it wasnt before). Surprise: the CPU is now 50-60% and the video is choppy as hell. vainfo reports:

    VAProfileMPEG2Simple : VAEntrypointVLD
    VAProfileMPEG2Main : VAEntrypointVLD
    VAProfileH264Baseline : VAEntrypointVLD
    VAProfileH264Main : VAEntrypointVLD
    VAProfileH264High : VAEntrypointVLD
    VAProfileVC1Simple : VAEntrypointVLD
    VAProfileVC1Main : VAEntrypointVLD
    VAProfileVC1Advanced : VAEntrypointVLD

    So what's going on here?

  2. #2
    Join Date
    Feb 2010
    Posts
    8

    Default

    I forgot to add, I am running KDE 4.6 with Desktop Effects on. If this matters.

  3. #3
    Join Date
    Nov 2009
    Location
    Italy
    Posts
    970

    Default

    Did you try with desktop effects off?

  4. #4
    Join Date
    Aug 2007
    Posts
    6,641

    Default

    Basically vlc is very ineffective using vaapi. Much better are xbmc or mplayer vaapi.

  5. #5
    Join Date
    Feb 2010
    Posts
    8

    Default

    Desktop effects off solved it seemingly with videolan.

    Desktop effects on. xbmc was jerky though different ways than videolan. Crashed KDE when I tried to quit.

    mplayer-vaapi works even with desktop effects, and the CPU is below 5%. But I get the dreaded Your system is too SLOW to play this! message and very very occassionally a few frames drop (along with the audio). That was with -vo vaapi. If I add -va vaapi as well, this leads to a KDE crash after a few minutes.

    All in all either switch off desktop effects or go software or your KDE crashes.

  6. #6
    Join Date
    Aug 2007
    Posts
    6,641

    Default

    you need -va vaapi AND -vo vaapi otherwise it is not accellerated.

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