Author Topic: NASA's Worst Fail Yet!  (Read 963 times)

0 Members and 1 Guest are viewing this topic.

Offline happenby

  • Sr. Member
  • ****
  • Posts: 2768
  • Reputation: +1028/-1634
  • Gender: Female
NASA's Worst Fail Yet!
« on: July 19, 2018, 01:18:01 PM »
  • Thanks!0
  • No Thanks!0
  • This video isn't terribly long, but the first 10 seconds is plenty.  The ISS is virtual reality. 



    Offline Ladislaus

    • Hero Member
    • *****
    • Posts: 20181
    • Reputation: +11017/-5301
    • Gender: Male
    Re: NASA's Worst Fail Yet!
    « Reply #1 on: July 19, 2018, 01:51:20 PM »
  • Thanks!0
  • No Thanks!0
  •  :facepalm:


    Offline Seraphina

    • Full Member
    • ***
    • Posts: 638
    • Reputation: +525/-105
    • Gender: Female
    Re: NASA's Worst Fail Yet!
    « Reply #2 on: July 19, 2018, 03:45:45 PM »
  • Thanks!0
  • No Thanks!0
  • ??? :laugh2:

    Offline aryzia

    • Jr. Member
    • **
    • Posts: 382
    • Reputation: +119/-166
    • Gender: Female
    Re: NASA's Worst Fail Yet!
    « Reply #3 on: July 19, 2018, 10:10:17 PM »
  • Thanks!0
  • No Thanks!0
  •  :cussing: Billions of dollars used to distract and mollify as they take over.

    Offline Stanley N

    • Full Member
    • ***
    • Posts: 572
    • Reputation: +160/-229
    • Gender: Male
    Re: NASA's Worst Fail Yet!
    « Reply #4 on: August 02, 2018, 08:02:54 AM »
  • Thanks!0
  • No Thanks!1
  • You can see similar things from internet streaming live sports shows. I don't see how one could rule out a buffering problem or compression effects here.


    Offline Ladislaus

    • Hero Member
    • *****
    • Posts: 20181
    • Reputation: +11017/-5301
    • Gender: Male
    Re: NASA's Worst Fail Yet!
    « Reply #5 on: August 02, 2018, 10:22:02 AM »
  • Thanks!0
  • No Thanks!1
  • You can see similar things from internet streaming live sports shows. I don't see how one could rule out a buffering problem or compression effects here.

    The entire point is that there's obvious image composition and layering; that's why some parts of the picture are not affected.

    Offline Stanley N

    • Full Member
    • ***
    • Posts: 572
    • Reputation: +160/-229
    • Gender: Male
    Re: NASA's Worst Fail Yet!
    « Reply #6 on: August 03, 2018, 10:45:20 PM »
  • Thanks!0
  • No Thanks!1
  • The entire point is that there's obvious image composition and layering; that's why some parts of the picture are not affected.
    There is something going on in the video, yes, but referring to "layers" (a term from digital image editing) rather than something else is at least implicitly assigning a specific cause, and you say "parts of the picture are not affected" as if that is proof this is a layered video based on a green screen. This effect doesn't need to come from digital editing layers.
    Images are compressed with several techniques. One technique is that each frame is not stored as a stand-alone image. Instead, because most of a frame in a video doesn't change much, the difference between frames is stored in some way. Much modern video compression uses motion vectors, which means a block of pixels (dots in the image) is assigned a small motion to describe how that block of pixels translates for the subsequent frame. For example, a 4x4 block of pixels at locations (20-23,32-35) might be associated with a motion vector of (2,1), indicating that the block should move 2 pixels right and one pixel down for the next frame, and fill positions (22-25,33-36). This works great for compression because most of the image doesn't move at all, and the parts that do move tend to move in blocks in the same direction.
    If the motion vectors were repeatedly applied without new info, the pixels in the same 4x4 block (20-23,32-35) would again be moved in the (2,1) direction to (22-25, 33-36). Whatever pixels were in (20-21, 32) would be duplicated, but they would never go beyond (25, 36). They wouldn't affect the entire image, only as far as the motion vector goes.

    There may be other reasons to think ISS feeds are green screened, but I just don't see the evidence here.

    Offline Struthio

    • Full Member
    • ***
    • Posts: 650
    • Reputation: +159/-111
    • Gender: Male
    Re: NASA's Worst Fail Yet!
    « Reply #7 on: August 03, 2018, 11:14:11 PM »
  • Thanks!0
  • No Thanks!0
  • There is something going on in the video, yes, but referring to "layers" (a term from digital image editing) rather than something else is at least implicitly assigning a specific cause, and you say "parts of the picture are not affected" as if that is proof this is a layered video based on a green screen. This effect doesn't need to come from digital editing layers.
    Images are compressed with several techniques. One technique is that each frame is not stored as a stand-alone image. Instead, because most of a frame in a video doesn't change much, the difference between frames is stored in some way. Much modern video compression uses motion vectors, which means a block of pixels (dots in the image) is assigned a small motion to describe how that block of pixels translates for the subsequent frame. For example, a 4x4 block of pixels at locations (20-23,32-35) might be associated with a motion vector of (2,1), indicating that the block should move 2 pixels right and one pixel down for the next frame, and fill positions (22-25,33-36). This works great for compression because most of the image doesn't move at all, and the parts that do move tend to move in blocks in the same direction.
    If the motion vectors were repeatedly applied without new info, the pixels in the same 4x4 block (20-23,32-35) would again be moved in the (2,1) direction to (22-25, 33-36). Whatever pixels were in (20-21, 32) would be duplicated, but they would never go beyond (25, 36). They wouldn't affect the entire image, only as far as the motion vector goes.

    There may be other reasons to think ISS feeds are green screened, but I just don't see the evidence here.

    True, what you describe about compression techniques. But that does not explain what we see in the video. It's a first guess, that - if only moving parts of the whole scene are full of error - then it might be some problem depending on the compression technique. But 1.) the video has problems not only where the moving actors are, it has problems in areas supposed to be at rest 2.) what software error would create effects we observe in the area of the moving actors? 3.) etc.

    I agree, that a proof for layers is not given. On the other hand, your objection is not substantiated either. I have seen lots of errors in digital videos, which reveal something about the compression methods. In my opinion, this video here shows something different. I don't have any experience though, to judge whether it indicates layers.
    It is absurd to imagine that he who is outside can command in the Church — Leo XIII., Satis Cognitum, 1896


    Offline Struthio

    • Full Member
    • ***
    • Posts: 650
    • Reputation: +159/-111
    • Gender: Male
    Re: NASA's Worst Fail Yet!
    « Reply #8 on: August 03, 2018, 11:15:40 PM »
  • Thanks!0
  • No Thanks!0
  • -error-
    It is absurd to imagine that he who is outside can command in the Church — Leo XIII., Satis Cognitum, 1896

    Offline Struthio

    • Full Member
    • ***
    • Posts: 650
    • Reputation: +159/-111
    • Gender: Male
    Re: NASA's Worst Fail Yet!
    « Reply #9 on: August 03, 2018, 11:18:56 PM »
  • Thanks!0
  • No Thanks!0
  • -error-
    It is absurd to imagine that he who is outside can command in the Church — Leo XIII., Satis Cognitum, 1896


     

    Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16