Didnt they say the res is 640x480?

Discussion in 'iPod' started by ImNoSuperMan, Sep 12, 2006.

  1. ImNoSuperMan macrumors 65816

    ImNoSuperMan

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    Dec 1, 2005
    #1
    I was just browsing through the new iTMS and noticed this:-
    Picture 2.jpg Picture 3.jpg Picture 4.jpg
    How can they claim it to be Widescreen and on the other hand claim the resolution be 640x480. Can someone tell me what resolution will such supposedly WideScreen movies sport. will it be 640x400 or 720x480???
     
  2. mrgreen4242 macrumors 601

    mrgreen4242

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    Feb 10, 2004
    #2
    I noticed that as well. I'm not keen on dropping $10 to find out though. Theories: anamorphic encoding? Letterboxed (shudder)?

    I'm headed home from the office right now, but I wonder if HD TV shows are going widescreen as well (Lost, 24, etc)... I'll bite for anamophic DVD quality lost in 5.1 at $2 per 'sode...
     
  3. rjgonzales macrumors regular

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    Texas
    #3
    It's either letterboxed or anamorphic.

    Letterboxing is when black bars are placed on top and bottom making the res of the image 640x360.

    Anamorphic is a vertically stretched image that will widen to fill the width of the screen. black bars are actually a lack of data rather than bars added in.

    This is a very simple explaination... I'm sure someone will follow up soon with more details.
     
  4. EssentialParado macrumors 65816

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    Feb 17, 2005
    #4
    Can't someone just watch a trailer? (Are the trailers in the high-res?)

    I can't watch them as I haven't installed the new QT yet.
     
  5. j26 macrumors 65832

    j26

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    #5
    There is a note on this page

    " 1. Exact resolution depends on aspect ratio."

    It seems they won't all be 640x480
     
  6. Meatball macrumors regular

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  7. esaleris macrumors 6502

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    Oct 18, 2005
    #7
    Maybe it's just always 480p (480 lines of resolution horizontally) regardless of the width of the movie.
     
  8. balamw Moderator

    balamw

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    #8
    Previously for TV shows it was the other way around widescreen meant keep 320 horizontal, less vertical. :(

    B
     
  9. maddav macrumors 6502

    maddav

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    #9
    I would be more than willing to test it out, alas iTunes has yet to grace the UK with any offerings of TV shows or movies :rolleyes:
     
  10. mrgreen4242 macrumors 601

    mrgreen4242

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    #10
    The trailers seemed to be linked to separate files - that is they're not like the TV show trailers where it's just a clip, it's the theatrical trailer. For example, check out Grosse Point Blank (great movie)... the trailer is a 4:3 video but the movie is listed as being widescreen.
     
  11. MarkCollette macrumors 68000

    MarkCollette

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    #11
    It's the same thing with DVDs. The video is NTSC quality (640x480). But you'll only get that resolution if it's "full frame". If you have a widescreen video, then you'll get less vertical resolution.

    And no, they don't encode the black bars in the video, that'd be a waste of disk space. But yes, when that video plays, it'll probably show black bars. Depends on your screen.
     
  12. mrgreen4242 macrumors 601

    mrgreen4242

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    #12
    DVDs use anamorphic encoding, so they use the full 640x480 pixels of resolution for widescreen video. I don't feel like typing it all again, if you want an explanation of anamorphic encoding search for recent posts by me. Point is that a 640x480 NTSC file can be "tricked" into holding full resolution widescreen video.
     
  13. balamw Moderator

    balamw

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    #13
    That's 'cause DVDs native resolution is actually 720x480. :p

    It only turns into 640x480 when you try to rip it into MPEG-4 or somethig like that.

    B
     
  14. mrgreen4242 macrumors 601

    mrgreen4242

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    #14
    Nope. DVDs are in 640x480, you can do the same search... oh hell, read here: http://en.wikipedia.org/wiki/Anamorphic
     
  15. balamw Moderator

    balamw

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    #15
    Sorry. That link doesn't have it, but this one does. http://en.wikipedia.org/wiki/DVD-Video

    You're getting confused by the fact the the DVD format is optimized for widescreen and is compressed horizontally for display on standard SDTV 4:3 displays.

    B
     
  16. mrgreen4242 macrumors 601

    mrgreen4242

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    #16
    I'm pretty sure that NTSC ONLY allows for a 4:3 signal, and DVDs are fully NTSC compliant. 4:3 with a 480 pixel height is 640 wide. Non square pixels are used to get a 720x480 video signal in there, though, which is part of the spec, which I think is what is confusing... this site explains it in pretty decent plain language: http://www.dvddemystified.com/dvdfaq.html#3.4.1

    Either way, there is little doubt that (region 1) DVDs are NTSC and NTSCS only defines a 4:3 format, but the DVD spec makes a nice hack of this with anamorphic encoding to allow 720x480 pictures on a 640x480 frame.
     
  17. balamw Moderator

    balamw

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    #17
    Yes, but NTSC is an analog spec, and thus the horizontal resolution is effectively unlimited. (it knows nothing about pixels, only scanlines).

    Have a look at this link, which tells you how to do the anamorphic squeeze on your analog SDTV to get higher horizontal resolution from your DVDs.

    http://gregl.net/videophile/anamorphic.htm

    B
     
  18. Nermal Moderator

    Nermal

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    #18
    Balamw is correct. Can we get back on topic now please? :)
     
  19. mrgreen4242 macrumors 601

    mrgreen4242

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    #19
    Ug, I just had a whole long post written, but I deleted it, this is stupid. The DVD spec is terrible. It calls for a 1.5:1 file, but mastered to work on a 1.33:1 display. In turn, DVDs take a 1.78:1 image, squeezes it to be a 1.33:1 images, which is then encoded to a 1.5:1 file.

    Regardless of how you look at it, the Region 1 DVD is specifically mastered around NTSC, which is a 4:3 format. Any widescreen content put onto a DVD has to be adjusted, one way or the other, to fit into that aspect ratio.
     
  20. Bibulous macrumors 6502a

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    Jan 19, 2005
    #20
    Here's a screen shot playing a movie I just downloaded at Actual Size vs photo shop file 640x480 at 100%.

    Looks like it's 640x270.
     
  21. MarkCollette macrumors 68000

    MarkCollette

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    Calgary, Canada
    #21
    It's going to be interesting to see how the picture quality of these compare to DVDs, as the eye sees it. The resolution will be close, but probably slightly smaller than DVD, from what you guys are saying. Plus, different codec, bitrate, total file size. Nice to see if there's less motion artifacting since no MPEG2.

    The only obvious loss is that it's only stereo sound, with no 5/6/7.1 surround. I've never had a spiffy sound system, so won't change anything for me, but I can see how others might not like that.

    Do they say anywhere how fast your computer has to be to play the video?

    Also I'd love to see how these compare to typical bit torrent downloadable DviX encoded videos.
     
  22. amin macrumors 6502a

    amin

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    #22
    Letterboxed it is :(.
     
  23. weeag macrumors regular

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    Dec 27, 2005
    #23

    So how's that compared to a normal DVD I watch on my mac? If you take the downloaded iMovie and go full screen does it get pixelated or is it comprable to a DVD. (I read through the earlier discussion about DVD resolution but I'm too lazy to think through all that. Plus real world examples are always best).

    Also, can iMovies be burned to DVD's and watched on the tv (legally and physically possible)?
     
  24. EssentialParado macrumors 65816

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  25. ImNoSuperMan thread starter macrumors 65816

    ImNoSuperMan

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    Dec 1, 2005
    #25
    Grrrr.. Cant believe it. So Apple is now trying to sell 270p movies as 480p one. Compared to regular Widescreen DVDs it`s half the resolution. Do they call 50% resolution as nearly DVD quality.:mad:

    Thank God they dont offer anything in India. Or else I`d be really mad at Apple right now.
     

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