240FPS 720P - for real?

Discussion in 'iPhone' started by roeiz, Oct 23, 2015.

  1. roeiz macrumors 6502a

    roeiz

    Joined:
    Sep 13, 2010
    #1
    from the few videos i took on this slow motion mode,
    i'm not quite sure i'm convinced the 6s plus really does 240 fps in REAL 720p..
    i know what 720p should look like,
    and it really looks lower quality than that..

    anyone noticed? checked this? did some tests?

    thanks.
     
  2. jermy4 macrumors demi-god

    Joined:
    Jun 27, 2010
    #2
    My guess is that it's probably a lower bitrate to be able to capture 240fps. 720p is really just a resolution.
     
  3. roeiz thread starter macrumors 6502a

    roeiz

    Joined:
    Sep 13, 2010
    #3
    so what you say the lower bitrate makes it a "low grade" 720P, right?
    opposed to a "normal" 720p video with high bit rate tha looks MUCH better..
    bummer.
     
  4. jermy4 macrumors demi-god

    Joined:
    Jun 27, 2010
    #4
    That is my guess, you could take a 720p video and a slo mo 720p video and compare the video bitrates to see if I'm right.
     
  5. Newtons Apple macrumors Pentium

    Newtons Apple

    Joined:
    Mar 12, 2014
    Location:
    Jacksonville, Florida
    #5
    I would think that without good lighting 240fps would have the sensor ISO cranked way up and that would cause poor image quality.
     
  6. roeiz thread starter macrumors 6502a

    roeiz

    Joined:
    Sep 13, 2010
    #6
    i think you might be right.
    i've done more videos at darker conditions and it's even worse..
     
  7. cbrand493 macrumors 6502

    Joined:
    May 19, 2015
    Location:
    Perth, Australia
    #7
    That would cause noise though, not poor quality (low resolution). I think it's more the bit rate than the ISO.
     
  8. CNeufeld macrumors 6502a

    Joined:
    Nov 25, 2009
    Location:
    Edmonton, AB
    #8
    Can't you download the video to a computer and use some of the software that's readily available to view the details on it?

    C
     
  9. roeiz thread starter macrumors 6502a

    roeiz

    Joined:
    Sep 13, 2010
    #9
    Video
    ID : 2
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L3.1
    Format settings, CABAC : Yes
    Format settings, ReFrames : 2 frames
    Format settings, GOP : M=2, N=90
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 1mn 16s
    Source duration : 1mn 16s
    Bit rate : 3 362 Kbps
    Width : 1 280 pixels
    Height : 720 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Variable
    Frame rate : 29.908 fps
    Minimum frame rate : 3.750 fps
    Maximum frame rate : 30.000 fps
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.122
    Stream size : 30.6 MiB (97%)
    Source stream size : 30.6 MiB (97%)

    funny it says max frame rate 30fps, but it playes it at 240fps..
     
  10. geoff5093 macrumors 68000

    geoff5093

    Joined:
    Sep 16, 2014
    Location:
    Dover, NH
    #10
    Right, but a higher ISO means a worse looking image/video.
     
  11. Newtons Apple macrumors Pentium

    Newtons Apple

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    Mar 12, 2014
    Location:
    Jacksonville, Florida
    #11
    Have you tried doing a video in very good light?
     
  12. roeiz thread starter macrumors 6502a

    roeiz

    Joined:
    Sep 13, 2010
    #12
    well not really :rolleyes:

    but i expected more decent results in not a full daylight environment tbh.
     
  13. Newtons Apple macrumors Pentium

    Newtons Apple

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    Mar 12, 2014
    Location:
    Jacksonville, Florida
    #13
    might be expecting a little too much but I hope you get it worked out.
     
  14. Mercenary macrumors 6502a

    Joined:
    Sep 17, 2012
    #14
    It's because to shoot at 240fps it has to use a really high frame rate of 480 vs the usual 60. This means it has to use a really high iso to compensate OR you flood the scene with light. And knowing most people your probably filming in a room with next to no light.

    When I say flood with light I'm talking about bright sunlight.
     
  15. roeiz thread starter macrumors 6502a

    roeiz

    Joined:
    Sep 13, 2010
    #15
    well if it was really only high iso then it was just more noisy.
    but it's not just that. the picture is very unsharp, and pixelated, almost like 480P res.
    so i think low light also makes the hidden artifacts more pronounced.
    also, a limited bitrate also has something to do with it.
     
  16. m.level macrumors newbie

    Joined:
    Apr 3, 2010
    Location:
    Italia

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