a question about video recording

Discussion in 'iPhone' started by vinnyemmery, Jun 3, 2009.

  1. vinnyemmery macrumors member

    Joined:
    May 5, 2008
    #1
    hi guys at the moment it seems pretty safe to expect at least a 3.2 mp cam in the new iphone,but can anyone explain the max reolution this couid possibly record at eg 720p or is it software software rather than hardware limitation many thanks
     
  2. fishkorp macrumors 68020

    fishkorp

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    Ellicott City, MD
    #2
    Most 3.2mp cameras that record video do so at only 640x480. This is probably a hardware limitation though. Theoretically it should be able to shoot 720p depending on what the other hardware is. Someone with more expertise in this arena can hopefully chime in.
     
  3. kisbys macrumors regular

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    May 31, 2009
    #3
    theoretically it could record 1080p but again as has been said depends on the unit hardware software....
     
  4. Carniphage macrumors 68000

    Carniphage

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    #4
    Well 720p is about 1 megapixel.

    C.
     
  5. Small White Car macrumors G4

    Small White Car

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    #5
    The limiting factor is the phone's processor.

    First, imagine if you saved 30 still photos a second from the camera. Even at 640x480 you'd run into a GB of video within a few minutes. That's why video is heavily compressed, usually by comparing frames to each other and throwing out data that's the same from one fram to the next. The computer fills that data back in during playback. So you save hard drive space, but the trade-off is encoding time.

    This means you need a powerful processor to play video back (and the iPhone can handle this) but an even more powerful processor to encode it in real-time or near-realtime.

    So the question is, how good will the iPhone's processor be at doing that? My guess is that it can handle 640x480 video, but doing 1280x720 video would be too much work for it. In other words, if the iPhone shot HD, you'd shoot for 1 minute and then have to wait 2 minutes for it to save!

    It's unlikely Apple would allow the video feature to work that way since people would consider it slow and worthless. So there probably won't be HD video recording on the iPhone until its processor gets faster in the future.
     
  6. cellocello macrumors 68000

    cellocello

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    Toronto, ON
    #6
    I'd be surprised if the recording was anything other than 640x480 (with possibly an "MMS" option for 320x240 video).
     
  7. Carniphage macrumors 68000

    Carniphage

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    #7
    The real bottleneck is the compression process - which is much more computationally intensive than playback. The Compressor has to search through a lot of pixel data looking for stuff they can throw away.

    But if you look at something like the Flip Mino HD. - It is a small phone-like device *can* record 720p. All you need is the right chip.

    I think if Apple were to add video, perhaps they'd pick 720p h264.
    The quality could be stunning.

    However, those files can be quite bulky - a megabyte gets you 3 seconds or so. A gigabyte get you an hour.

    But if you wanted to mail or MMS the video - it would need to be scaled down to a smaller size.

    C.
     
  8. The General macrumors 601

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    Jul 7, 2006
    #8
    I would be surprised if Apple makes it record at 4:3 and not 16:9.
     
  9. cellocello macrumors 68000

    cellocello

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    Toronto, ON
    #9
    Hmm ... interesting.

    I wonder. Well, the iPhone screen isn't quite 16:9 either, and the leaked screens seem to say that at least a little bit of the screen is lost to the 'control bar' at the bottom, making the viewfinder image even less "wide" (or tall I suppose, depending on the orientation).

    You make a good point though - 4:3 in the world of 16:9 does seem a little archaic.
     
  10. fishkorp macrumors 68020

    fishkorp

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    #10
    Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A312g Safari/528.16)

    Isn't the biggest bottleneck the NAND write speed?
     
  11. vinnyemmery thread starter macrumors member

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    May 5, 2008
    #11
    so when the omina hd comes out is the processor in that more powerful than the iphone processor and hardware
     
  12. Carniphage macrumors 68000

    Carniphage

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    Location:
    Sheffield, England
    #12
    The Omnia records 720p. We don't know what the iPhone will record yet. It won't be the CPU that does the compressing - but a dedicated chip.

    C.
     
  13. ruinfx macrumors 6502a

    Joined:
    Feb 20, 2008
    #13
    the omnia hd uses the omap3 processor (likely the same one found in the pre) and PowerVR SGX graphics technology.

    we will have to wait and see what the next iphone has inside.
     

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