Why do iTunes Store Movies look so good compared to DVD rips?

Discussion in 'Apple TV and Home Theater' started by skunkworker, Sep 21, 2009.

  1. macrumors regular

    Joined:
    Sep 9, 2007
    #1
    I have been noticing recently that the iTunes Store Movies have been looking unusually good for their size. Is it they take the HD source and oversample it down to 720x400? or are they using better h.264 b-frames?
     
  2. macrumors 6502a

    Joined:
    Sep 18, 2006
    Location:
    Prestatyn, Wales, UK
    #2
    I would imagine that If Apple encode them themselves, they do it direct from the master tapes rather than ripping from DVDs.
     
  3. macrumors 65816

    Joined:
    Jan 13, 2006
    Location:
    Chester, NJ
    #3
    Yeah I would surmise that Apple has access to better sources than DVD from which to do their master encodings, plus the fact that they wouldn't be going through multiple encodings... I.E. going from some high quality source to H.264 instead of high quality source to MPEG-2 to raw to H.264 (two levels of compression artifacting).
     
  4. macrumors 68020

    theBB

    Joined:
    Jan 3, 2006
    #4
    Their encoding algorithms may be more sophisticated than what is available for free to the public. They may also have the ability to manually increase bit rates or change compression algorithms for certain sections of the movie to get better image quality. I've heard that even for DVDs they don't just feed it into a program to do it, they actually spend quite a bit of time to make the movie look as good as they can.
     
  5. macrumors 6502

    Joined:
    Jul 5, 2007
    #5
    I don't think it is Apple that is doing the encoding. I think that they get it that way from the distributor/studio. Other than that, all the points above would apply to the distributor.
     
  6. macrumors 6502a

    pacmania1982

    Joined:
    Nov 19, 2006
    Location:
    Birmingham, UK
    #6
    I was thinking about this the other day as I watched a movie I had ripped on my Apple TV. I sure would love to know how Apple do it - as in what their process is.

    pac
     
  7. macrumors 65816

    Joined:
    Jul 25, 2003
    #7
    I heard that Steve spends his evenings encoding content for the iTMS, using the latest HandBrake snapshot :D
     
  8. macrumors 65816

    Aldaris

    Joined:
    Sep 7, 2004
    Location:
    Salt Lake
    #8
    lol

    "I heard that Steve spends his evenings encoding content for the iTMS, using the latest HandBrake snapshot"

    Made my day, him and a tin of ben an' jerry's!

    Well, I have had some good rips and some bad rips, if you look at "sleepy hollow'" on iTunes it looks like crap, same with the original pirates, before they upped it to HD.

    As for us using handbrake, we have limited systems compared to duplication/encoding houses, but I think if we tweak a bit and put more time in it we can get some nicer stuff too.
     
  9. macrumors 68040

    Joined:
    Jun 20, 2007
    #9
    The recent update to HD also brought Anamorphic Encoding w/ 5.1 Dolby Surround Sound to SD content as well. As stated by Apple at NAB 2007 (or '06, don't remember), they use Compressor to encode all video content on the store.

    To answer your question, any of the recently encoded content from within the past year looks just as good as a DVD Handbrake rip (HD obviously better) due to the anamorphic encoding.
     
  10. macrumors 68020

    Joined:
    Mar 27, 2003
    #10
    No mystery. Sources much higher res than even blu ray. Bring a macpro octo to its knees running that source through hb. Nothing more and nothing less. To think you can duplicate it from a 480p dvd source (or even come close) is craziness.

    Realize that transcoders like hb can only calculate compression based upon what they are given for sources. each transcode drops the visual quality. Thats why blu ray rips transcoded down to 480p look so much better than the sd dvd 480p source transcoded to a 480p hb encode and on and on.

    I would say that *if* you had access to the sources the studios had, you could get close if not comparable output (maybe even better?). Of course you might need a server farm to do it in any meaningful amount of time.
     
  11. macrumors 6502

    Joined:
    Aug 21, 2008
    #11
    actually Steve's macbook pro has a blu-ray drive...:eek:
     
  12. macrumors 6502a

    Joined:
    Aug 26, 2009
    #12
    Yeah, with iTunes, its consistent file size but inconsistent quality.

    Most of the movies look very good. Some, even at 640x480, I can't distinguish from an upscaled DVD (not that I go out of my way to try to compare. If it looks good, it looks good and I leave it at that).

    However, as someone mentioned, there are a few times when something looks crap. It's not often, and the filesize and consistency of filesize overrides any issues I have with that.

    Meanwhile, movies I encode with Handbrake at the universal setting, look good but are wildly inconsistent in filesize. When I go the iPod legacy route, I end up with similar filesize to that of the iTunes store. I find most films (dramas, non-animated) are perfectly fine with the iPod legacy preset in Handbrake. However, I go with Universal anyways.

    With TV shows, that's an entirely different story, especially with animated and older comedies. They look like crap from the iTunes store. I encode those myself.

    Like I said, file size is significantly larger (some episodes of The Simpsons ring it at a whopping half a gig per episode), but that also includes two or three audio tracks.
     
  13. macrumors 603

    Joined:
    Feb 4, 2008
    #13
    Although I doubt it's literally "tapes," Apple likely has access to the master video copies, or at least uncompressed. Don't forget that DVDs are compressed video, which means some data was already lost going from master to DVD. Apple's software for encoding is probably written better since it's not some open-source "we're trying our best" effort like HandBrake.

    What's hilarious is I bet there's a room somewhere that uses Blu-ray Discs since those are lossless media. I know zip about the movie industry, but that sounds like an easy way to give Apple an uncompressed copy.
     
  14. macrumors regular

    Joined:
    Mar 12, 2008
  15. macrumors 6502

    mooblie

    Joined:
    Apr 23, 2009
    Location:
    The Highlands, Scotland
    #15
    The video content on Blu-ray video discs is compressed.

    Blu-ray discs are only "lossless" in the sense that ANY digital storage medium is lossless - you read from them exactly whatever you write to them, but what gets written to them is a compressed version of the original images.

    You admit you know "zip" about the movie industry, but please don't inadvertently start an apocryphal tale that "Blu-Ray is lossless" - like the tale that everybody latched onto about ten years ago that "DVD was a good medium for archiving movies". Both completely untrue.
     
  16. macrumors 6502

    Joined:
    Jun 5, 2008
    #16
    LOL what does "oversample it down" mean? :confused: DVD native resolution is 720x480 in the US and 720x576 in europe.

    They will look exactly the same as a DVD ISO image. If you're using something like Handbrake to rip a DVD and make it into a smaller file size, you are compressing the crap out of your DVD and killing the quality.
     
  17. macrumors 601

    jaw04005

    Joined:
    Aug 19, 2003
    Location:
    AR
    #17
    Blu-ray sound on certain titles is lossless, but video is compressed.
     
  18. macrumors 6502a

    Joined:
    Aug 26, 2009
    #18
    Audio on many DVD's is lossless too.
     
  19. macrumors 68020

    Joined:
    Mar 27, 2003
    #19
    Er, lossless vs. what ? The original master the film was shot in ? Even DTS is compressed from the original. AC3 (which the dvd spec requires) is also compressed. Not sure what you mean by "Lossless".
     
  20. macrumors 6502

    Joined:
    Jul 18, 2008
    #20
    Spice Weasel - Thank you. That has made my day. I've got this great image of Steve Jobs in a turtle neck, boxers, and rabbit slippers, eating a bologna sandwich, a coke can with a straw sticking out of it next to him, staring at an apple cinema display, shaking his head because Handbrake isn't supporting Blu-ray subs. Maybe even throw in the Woz walking into the room in a bathrobe and black socks eating a slice of pizza asking if Jobs wants to go outside and play Segway polo... (by the way, in my cartoon bubble, Jobs and Woz aren't gay, just roomies in the same apartment.)
     
  21. macrumors 6502a

    Joined:
    Aug 26, 2009
    #21
    PCM audio.
     
  22. macrumors 68020

    Joined:
    Mar 27, 2003
    #22
    mea culpa. compressed though lossless. I stand corrected. sorry.
     
  23. macrumors 6502a

    Joined:
    Feb 4, 2008
    #23
    Not actually. PCM is not compressed. However, I believe that DVDs are limited to 2.0 sound if using PCM.
     
  24. macrumors 68020

    Joined:
    Mar 27, 2003
    #24
    I guess I was referring to MLP (lossless encoding) for pcm which is quite common. Though afaik pcm tracks generally lend themselves to music dvd's etc. especially when they were originally recorded in stereo.

    To the OP: apologies for derailing the thread. But to the point of the title.

    in terms of video, the extremely high quality of the *video* source lends itself to the relatively excellent quality. Yes, even blu ray is compressed (video) though with better codecs (like h.264, etc.) than the mpeg-2 used on standard dvd's.
     
  25. macrumors 6502a

    Joined:
    Dec 30, 2008
    Location:
    Nottingham, UK
    #25
    But surely the very act of taking any analogue signal, be it audio or video, and converting it to digital results in some form of loss, unless you can sample it with an infinate resolution. Or am I just talking rubbish ;)
     

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