HD rips stuttering

Discussion in 'Apple TV and Home Theater' started by liquidsuns, Sep 26, 2010.

  1. macrumors 6502

    Joined:
    Jun 23, 2009
    #1
    I'm having a problem with all my blu-ray rips stuttering during playback. They seem to have a really slow frame rate. It mostly happens during action scenes, but occurs at other times too. Some are worse then others. Streaming them makes the problem worse.

    I figured it was maybe because I encoded them at too high a frame rate or something, but when checking the fps through Quicktime, they are all under 24fps.

    I rip with makemkv then use handbrake to encode at with these settings:

    resolution: 1280x720
    fps: same as source
    advanced: ref=3:mixed-refs=1:bframes=3:me=hex:subq=7:b-adapt=2:8x8dct=1:weightb=0:trellis=0:weightp=0

    All the bit rates are between 2000-4500kbps

    Purchased HD iTunes movies play fine. All the HD movies are synced to the AppleTV. Everything plays fine on iTunes. Any clues as to why this is happening?
     
  2. macrumors 6502a

    Joined:
    Dec 30, 2008
    Location:
    Nottingham, UK
    #2
    If streaming makes them worse then it sound like you're getting bit-rate spikes that are too high. This is the advanced string from the AppleTV preset notice the vbv-maxrate and vbv-bufsize options, these limit any bit-rate spikes, not saying this is you problem but it's worth a try.
    I suggest using the AppleTV preset and adjust the resolution to 1280x720. Just out of curiosity are you using Handbrake 0.9.4? If so I don't think it includes the vbv setting in the ATV preset. I would download the latest nightly version from here:-

    https://build.handbrake.fr/
     
  3. macrumors 68000

    Joined:
    Jan 26, 2006
    Location:
    Whitehouse, OH
    #3
    Depending on what version of Handbrake you are using, you may have CABAC enabled which is causing issues with both synced and streamed content if you aren't careful.
     
  4. thread starter macrumors 6502

    Joined:
    Jun 23, 2009
    #4
    I'm using 0.9.4. I'm going to try the nightly build and use the default Appletv settings and see what happens.

    Checking the version of handbrake I've been using, there is an option checked under advanced settings called CABAC Entropy Coding, which isn't enabled in the nightly build. But all the SD dvds play fine both synced and streamed. It's just the blu-ray rips.
     
  5. thread starter macrumors 6502

    Joined:
    Jun 23, 2009
    #5
    So I did a partial encode of and HD movie using the AppleTV preset with the nightly build and it seems to have solved the problem. It played fine even while streaming.

    Thanks a lot guys. I've got some reencoding to do...
     
  6. macrumors 6502a

    Joined:
    Dec 30, 2008
    Location:
    Nottingham, UK
    #6
    No problem, glad it's working now.
     

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