Question for Video savvy, Snow Leopard users...

Discussion in 'macOS' started by RemarkabLee, Aug 28, 2009.

  1. RemarkabLee macrumors 6502a

    Nov 14, 2007
    ...just wondering if someone could test the following, which may be useful for others interested in video on Snow Leopard and QuickTime X...

    The trim feature, is it lossless?

    In other words, does it trim to the nearest 'I' frame, therefore no frames are re-compressed, or will I still need to use a third party piece of software such as MPEG Streamclip for this functionality?

    I guess the easiest way to discover this would be using a HD video clip. The time it takes to write to disk would be a clear indication of a lossless clip and save vs a clip and render.


    Lee. :apple:
  2. rorschach macrumors 68020


    Jul 27, 2003
    Not TOTALLY sure what you mean but I just made a video of me doing a trim and save - see if that helps!

    (BTW don't know why it's sped up but you can see the save after you trim it takes 3-4 seconds tops.)
  3. RemarkabLee thread starter macrumors 6502a

    Nov 14, 2007
    Thanks for that, it was quick, but inconclusive unless you can let me know the resolution of the clip and filesize.

    The larger the better will differentiate between the two possibilities.

    Any chance you can try it on a large res, large size clip? If you don't have anything local, you could use a movie trailer from


  4. uaecasher macrumors 65816


    Jan 29, 2009
    Stillwater, OK
    The trim is really useful and you can trim by frames
  5. RemarkabLee thread starter macrumors 6502a

    Nov 14, 2007
    Yes, but does it do it losslessly? Perhaps you didn't understand my specific question.
  6. Mirai 11 macrumors 6502

    Mirai 11

    Aug 3, 2005
    slightly off topic, but can this still be applied to audio files too?
  7. RemarkabLee thread starter macrumors 6502a

    Nov 14, 2007


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