weird video file size problem

Discussion in 'Digital Video' started by woodyuk, May 11, 2017.

  1. woodyuk macrumors newbie

    Oct 24, 2015

    I have a 15 second MP4 which came from FCPX and encoded using iffmpeg. These programs / settings and mediaInfo tells me the video size is 1280 x 720 pixels.

    The video is being used as a background video on a website with Wordpress. However, part of Wordpress thinks the video is 3456 x 720 AND what's really weird is if I go to "Get Info" on the file in my Mac it says its 3456 x 720 as well. Checked on another MacMini (not retina) and same thing 3456 x 720.

    Any ideas ? Totally stumped ;)
  2. HobeSoundDarryl, May 11, 2017
    Last edited: May 11, 2017

    HobeSoundDarryl macrumors 604


    Feb 8, 2004
    Hobe Sound, FL (20 miles north of Palm Beach)
    Why don't you try an experiment to see if the issue is out of FCPX or in iffmpeg: export it directly from FCPX to AppleTV2 format (which is 1280X720). "Get info" and see if that render is 1280 or 3456. Of if that option is no longer available in FCPX, export as Prores and then render it with Handbrake using the AppleTV2 profile. Again, "get info" and see if you have 1280 or 3456.

    Either way, if it's making it out of FCPX as the target size, check your iffmpeg settings. 3456 is a weird number relative to video resolutions- retina considerations or not. It's not quite 4K (in either common way 4K is defined). Nevertheless, I suspect you will get it out of FCPX at 1280 (or out of Handbrake at 1280). And if so, something in iffmpeg appears to be set such that it is rendering at super wide width OR perhaps there's some bug in iffmpeg???

    When you open one of these 3456 wide files in Quicktime, does the width of the window reflect an unusually wide window (and presumably what you will see is a 1280 wide original image stretched way out to 3456 wide)? Or does it look like it's 1280 x 720 as you expect?

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