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Discuss using hardware acceleration at the AppleTV 1 - Hackint0sh.org; Hello, I'm running XBMC on my appleTV. But I'm not happy, because of the missing ...
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    Question using hardware acceleration

    Hello,

    I'm running XBMC on my appleTV. But I'm not happy, because of the missing openGL hardware acceleration. So simple PAL or NTSC videos drop frames and so the video quality is bad.

    My question:
    Does exist any alternative for playing mpeg, divx, xvid, mkv,... video formats WITH GPU hardware acceleration on the appleTV smoothy?

    There are many programs for appleTV but I couldn't find anywhere an answer for this question.

    Thx for help.

    Dave



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    If PAL or NTSC videos drop frames, you have something very badly misconfigured with XBMC on the AppleTV. I suggest you post something to the XBMC for Mac forum with your problem and include atv, launcher and xbmc versions.

    OpenGL hardware acceleration IS present for scaling under XBMC. OpenGL does nothing with regard to decoding video.

    Does exist any alternative for playing mpeg, divx, xvid, mkv... video formats
    Now you are mixing video containers with video formats and need to be more specific with your question but nothing uses GPU hardware acceleration for video decoding under the AppleTV OS. Frontrow itself might or might not.

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    I used the windows-atvusb-creator (atvusb-creator - Google Code), installed xbmc over the web and playing videos from NAS. I have changed the XBMC setting but the problems are the same. Don't understand me wrong. The videos are playing fine but not really smoothly. When there is a moving scene, there a many little jumps in the movement.

    I thought it was a performance problem. Maybe there is another problem with the codec or codec settings. When I play the same PAL-mpeg-2 video on my Windows PC with Media player -> everything is fine. But When I play it with VLC I do have the same problems like ATV.

    Can I change the mpeg-codec in XBMC on ATV?

    Dave

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    Sounds like vsync is not turned on.

    change the mpeg codec for what? mpeg2 uses libmpeg2 for decoding. It does work very well for me.

    Again, I highly recommend bring up any issue on the XBMC for Mac forums.

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    Ok, I think maybe the problems are my videos. They are recorded them by myself from a DVB-S Card with ProgDVB. The Quality of the mpeg-stream is very high. Could this be a reason for dropped frames?

    My VLC player uses the same codec (liblibmpeg2_plugin.dll) as XBMC. When I play the videos on my PC, the mediainfo says, there are dropped frames and I can see the same effects like on AppleTV. But in mediaplayer everything looks fine.

    I don't understand that?!

    Dave

    (I had no success with Apple TV tuning (vsync, cache, library disable...) )


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    Use MediaInfo (the app) to fully qualify your video content. It eliminated the guess factor. Who knows what ProgDVB is creating. It's mpeg2 but what flavor?

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    Ok, here are the data from mediainfo:

    Format : MPEG-PS
    File size : 132 MiB
    Duration : 4min 40s
    Overall bit rate : 3 946 Kbps

    Video
    ID : 224 (0xE0)
    Format : MPEG Video
    Format version : Version 2
    Format profile : Main@Main
    Format settings, Matrix : üblich
    Duration : 4min 40s
    Bit rate mode : variabel
    Bit rate : 3 480 Kbps
    Nominal bit rate : 15,0 Mbps
    Width : 720 Pixel
    Height : 576 Pixel
    Display aspect ratio : 16/9
    Frame rate : 25,000 FPS
    Standard : PAL
    Colorimetry : 4:2:0
    Bits/(Pixel*Frame) : 0.336

    Audio
    ID : 192 (0xC0)
    Format : MPEG Audio
    Format version : Version 1
    Format profile : Layer 2
    Duration : 4min 40s
    Bit rate mode : konstant
    Bit rate : 192 Kbps
    Channel(s) : 2 Kanäle
    Sampling rate : 48,0 KHz
    Resolution : 16 bits

    Is there anything wrong?

    Dave100

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    And here are my ProgDVB Settings.

    http://www.bilder-hochladen.net/files/9oi9-1.jpg

    I don't know if the direct show setting results in the recoding.

    Thx for help.

    Dave

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    The important bits:

    Format : MPEG-PS
    Format profile : Main@Main
    Bit rate mode : variabel
    Bit rate : 3 480 Kbps
    Nominal bit rate : 15,0 Mbps
    Width : 720 Pixel
    Height : 576 Pixel
    Display aspect ratio : 16/9
    Frame rate : 25,000 FPS
    Standard : PAL
    Only issue here might be 25fps, XBMC on the ATV does not do any framerate compensation so if you are display on a 60Hz TV you will get a frame display mismatch that will look like tearing in high motion scenes. Video decode wise, the AppleTV should have no problem handling this.

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    But in XBMC-video settings I can activate a parameter called: "adjust refreshrate".

    Isn't this parameter to fix problems with 24, 25, 29,9, 30 Hz Videos or is this feature not working on ATV?

    Dave


 

 
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