Handbrake running extremely slow

Discussion in 'Mac Basics and Help' started by PhazonUK, Jul 12, 2010.

  1. PhazonUK macrumors 6502

    Jun 1, 2010
    I'm using a brand new MacBook to covert a DVD to m4v and it was running at a decent speed up until now. I just checked and it said it is converting 0.04 frames per second. Now, I don't know about you...but that's unbelievably slow. It occasionally goes up...to about 1 fps, but that's about it.
    I don't really wanna have to cancel it and start again as it has already taken around 2 hours to get to 80%.
    What on earth is going on...?
  2. TMRaven macrumors 68020


    Nov 5, 2009
    What's your cpu? If it's one thing that depends on a cpu, it's video encoding.

    My old G5 iMac ran at .05 fps for high profile x264 encodes, while a lynnfield can do the same talk at 80fps-- a 1600x increase for a cpu that's only 6 years newer.

    Also do note that speeds while video encoding will vary greatly depending on what it's doing. If you're doing a 2 pass encode with filters, the first pass will breeze by, but once it gets to the second pass where it actually has to apply filters and allocate macroblocks by frame prediction, the fps of your encode will slow down tremendously; the same can be said for high movement scenes vs stationary scenes.

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