iTunes 1080p and 720p size comparison

Discussion in 'Apple TV and Home Theater' started by Cynicalone, Mar 20, 2012.

  1. Cynicalone macrumors 68040

    Cynicalone

    Joined:
    Jul 9, 2008
    Location:
    Okie land
    #1
    Today I downloaded The Girl With The Dragon Tattoo in both 720p and 1080p. Well surprisingly the 1080p file is actually significantly smaller than the 720p file.

    Screen Shot 2012-03-20 at 1.21.58 PM.png

    Apple must be really compressing the files for this much of a difference in file size.

    And here is Captain America.

    Screen Shot 2012-03-20 at 1.26.19 PM.png

    And Thor.

    Screen Shot 2012-03-20 at 1.27.39 PM.png
     
  2. ftaok macrumors 601

    ftaok

    Joined:
    Jan 23, 2002
    Location:
    East Coast
    #2
    This was already discussed and I think the general consensus is that Apple's 1080p files are using a higher profile of h264. Something like 4.1 vs. 4.0 for 720p.

    The results is that Apple is able to get better looking video at lower bitrates.

    I guess if Apple were to re-encode the 720p files using a higher profile, they could use lower bitrates and achieve equal (or better) video quality. Not sure if going to a higher profile 720p file would break compatibility with older devices.
     
  3. GenesisST macrumors 68000

    GenesisST

    Joined:
    Jan 23, 2006
    Location:
    Where I live
    #3
    Do you mean like blowing up the 720p to 1080p? I would hope that they create new files from some master source file... Otherwise, what's the point?
     
  4. stordoff macrumors regular

    Joined:
    Aug 24, 2009
    #4
    He means that if Apple were to recreate the 720p files (from the master source) using the same settings they are using for the 1080p, the new 720p files would be smaller than the old 720p files, but the same quality.

    At the end of the day, iTMS 1080p looks better than iTMS 720p (at least in all the videos I've tested), so complaining about the file size is pretty meaningless.
     
  5. GenesisST macrumors 68000

    GenesisST

    Joined:
    Jan 23, 2006
    Location:
    Where I live
    #5
    Makes way more sense when I understand it properly! :D

    Thanks
     
  6. CylonGlitch macrumors 68030

    CylonGlitch

    Joined:
    Jul 7, 2009
    Location:
    SoCal
    #6
    I've only done two discs so far.

    We Were Soldiers
    720p - 5gb
    1080p - 15gb

    Speed Racer
    720p - 4gb
    1080p - 12gb

    I'm seeing about a 3x increase in file size. I used the same general settings for each. I start with the ATV2 setting in Handbrake; then for 720p set constant quality to 18. For 1080p I took the 720p setting and increased the frame size to 1920x1080, every thing else the same.

    I haven't yet played back the 1080p video, so I don't know how much worse / better it is than the 720 one.
     
  7. Los macrumors regular

    Joined:
    Jul 5, 2010
    #7
    Use High Profile instead with "Web Optomized" checked. You should see smaller file sizes with equal or better quality compared to the modified "AppleTV 2" preset. I've done two movies so far and they're around 8 GBs with bitrates of about 10 mb/s.

    If you lower the constant quality setting I'm sure you can get similar results like the iTunes versions.
     
  8. cwazytech macrumors 6502

    Joined:
    Jan 7, 2009
    Location:
    Colorado
    #8
    8 GBs? That seems larger than the iTunes 1080P movies. But that also seems like the size most people on these forums are reporting. Personally, since I consider 64gigs as limited space, I'd like to see my 1080P encodes stay the same size as my 720P encodes.
     
  9. Los macrumors regular

    Joined:
    Jul 5, 2010
    #9
    Oh no, that's my own personal preference. Not to mention that I have two language tracks and the AAC is at 320 kb/s and the AC3 is at 640 kb/s which add up to the file size. But using the High Profile will get you results closer to the iTunes 1080p files, you just need to find the proper RF.
     
  10. NightStorm macrumors 68000

    Joined:
    Jan 26, 2006
    Location:
    Whitehouse, OH
    #10
    That's not going to happen with current sources unless you sacrifice quality. The higher quality the source, the better it will compress.
     

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