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Horrible blue aliasing/artifacts in black areas during video playbackSupport


  1. kishin14

    kishin14 Well-Known Member

    Poor quality or not, the artifacting he's talking about is not present during playback on the rezound. That means that it's not just a poor quality issue. If it was, it would be present on any screen type. But it plays perfectly and looks as good as the show would on TV.

    I believe this has to do with the pentile screen and is not a codec issue. I had it on my Droid 3 which was also pentile. While it was not super amoled, it displayed the exact same issue the OP is talking about. There is nothing you can do about it. It's simply a limitation of the screen tech. It doesn't seem like it bothers most of the people here so its probably not nearly as bad as it was on my D3. But it obviously bothers the OP and it would probably bother me as well.
  2. jkc120

    jkc120 Well-Known Member

    Thanks for all the responses. If this is just a codec/crappy video, I've been unlucky in what I've been trying. For the folks who HAVE tried this in a VERY dark room, can you do me a favor and post a link to or instructions to find the video? I do have a netflix account. Unfortunately, the wifi signal in my parents' house is crappy and they are in BFE so I barely have 3G haha. But once I can reproduce this in a dark room, I'd like to try a video that people have watched that does NOT demonstrate it.

    If you can post the exact time in the video where there is a similar scene to the test video I posted, that'd help so I don't have to watch an entire movie or something :)

    I think I saw a couple of mentions of HD video trailers, but was that on youtube or somewhere else? And where (time wise) in the videos should I check out?

    Thanks in advance!
  3. jkc120

    jkc120 Well-Known Member

    I wonder why some people can't see it then, even with my test video. :confused: The blocky artifacts I can sort of fix by boosting the contrast, but there are other cases where I see the "slicing" artifact. The best way I can describe it is that it looks like I'm seeing a partially transparent pinkish (or greenish, depending the background) horizontal bar graph overlaid on the video.
  4. eyc

    eyc Well-Known Member

    There is a HUGE library of very good high definition video trailers that are playable on the Nexus here:

    Movie Download Index (0 - 9, A - H) | Movies - Digital Digest

    I downloaded the Tron trailer recently, which has a lot of dark images to test. I haven't tested it yet in low light conditions.
    jkc120 likes this.
  5. Foolish Mortal

    Foolish Mortal Well-Known Member

    I watched the clip you provided all the way through once, and to 20 seconds in a few more times, and I'm not seeing any problem. I'm in my office with the door closed and the lights off, but I went into the bathroom with no windows- pitch black, and no problem there either.

    I wish that I could help you. :(
  6. jkc120

    jkc120 Well-Known Member

    First of all, if you'd read the threads, I said this was just a sample clip I found that definitively demonstrates the issue. Maybe I should watch it though, since you have so much disdain for it. :)

    As for obsessing, yes I admit I am. Wouldn't you if one of the top 3 things you do on your phone was a MAJOR step backwards from your 2 year old phone you used previously? No phone is perfect, but there are certain things people are unwilling to "live with". For many, it's a poor signal relative to other phones, but that's not a deal breaker for me. Poor video quality playback IS for me and may be for others, which is why I started the other thread.

    Also, if you'd read the other thread you would know that this blockiness is sort of correctable but the other issue (I'll call it "semi-transparent bar graph overlay) is much more annoying to me. I still don't know what to make of that, and I have to find an example of it to post in the other thread.

    But, you are right, two topics on almost the same subject (well, the other is more of a superset of this) doesn't make sense. So I'll ask the mods to close/lock this one and track the issue in the other thread. ;)
  7. jkc120

    jkc120 Well-Known Member

    I just don't get it. I really don't think it's that subtle in a dark room. Perhaps it's something to do with the brightness of the screen automatically going high or low or something? I'll try fooling with the brightness inside mx player, but I've tried mx player, the built in video player and one other one from the market I can't remember the name of. :(

    *edit* Viewing in mx player and manually dropping the brightness does mask the effect a bit. I grabbed the MIB 3 HD trailer from youtube (via youtube-dl) and I could see the effect every so slightly on Will Smith around 24-28 seconds into the trailer. Definitely less pronounced, and also the video is 1080p so the size of the blocking was smaller.

    I'll try some other video sources and see if I can find 720p dark content that doesn't have the issue.
  8. jkc120

    jkc120 Well-Known Member

    By the way, which video player are you using and what brightness is your screen set to? Does your video app adjust the brightness when it starts? I'd like to try to watch it under IDENTICAL conditions as you did and see how much less noticeable the effect is. Thanks in advance!
  9. nj02vette

    nj02vette Well-Known Member

    I haven't directly seen the issue you are referring to, but also haven't truely investigated it thoroughly either. I'll try later.

    I will say that not everyone's eyes are the same. Some people were extremely sensitive to color banding problems on DLP technology, while others couldn't see it. Some people are sensitive to refresh rates, and others have an easy time with 3D art while some can't see it no matter how many times they cross their eyes. Point is, not everyone sees the exact same way. So keep future posts with that thought in mind.
    eyc likes this.
  10. jkc120

    jkc120 Well-Known Member

    Good point, and you're absolutely right. What *I* see doesn't mean others see the same thing. Even if we were in the same room watching my phone in the same conditions. I'm just trying to compare apples and apples so I can determine if indeed I received a bad couple of phones.

    I'm going to go watch the video again with full brightness and take a screen shot when the guys' head is exhibiting the artifacts to see if it still looks that way on the screen shot (which would indicate a codec/video quality issue I guess).
  11. rexdog1888

    rexdog1888 Well-Known Member


    Just tried and it is still there in the screen shot. I think its a codec issue.
  12. kishin14

    kishin14 Well-Known Member

    I honestly don't know why others can't see it. Perhaps they just aren't looking hard enough or maybe it's a condition that common to super amoled (in the sense that it affects most) but there are a few that it doesn't occur on). I honestly don;t think you got a bum screen. Like I said, I'm pretty sure it's a super amoled thing. Check out this post, which is about a similar problem with the super amoled screen on the razr that also only seems apparent in a dark room:

    black screen blotchy (bootup / wallpaper) - Android Forums at AndroidCentral.com
  13. jkc120

    jkc120 Well-Known Member

    I took a screenshot during the problematic part after pausing it. While paused I could absolutely see the blue blocks. The screenshot does not depict the issue, but then again I'm viewing it on a laptop that has an LCD heh.

    Here's the screen shot I took.

    http://i.imgur.com/w44DC.png
  14. jkc120

    jkc120 Well-Known Member

    Really?? I took a screen shot and I don't see it in there. Weird.

    Maybe I will try to find this episode online in avi format which I think usually contains "regular" mpeg 4 part 2 video not H.264 and see if it still has the issue. Worth a shot I guess.
  15. EarlyMon

    EarlyMon The PearlyMon Moderator

    It looks very much like we had two threads on the same issue, really - so they're now merged.

    Hope this helps!
    jkc120 likes this.
  16. rexdog1888

    rexdog1888 Well-Known Member


    I just opened your screen shot on my phone. Its not as obvious but when I zoomed in I could completely still see it(blue squares in his hair).


    EDIT: Nevermind I just opened the pic on my old thunderbolt and couldn't see the effect. Its definitely a GNex issue.
  17. jkc120

    jkc120 Well-Known Member

    I think it's an s/amoled issue, not a GNex issue. Someone posted a link to a Razr thread of a ton of people complaining about the same thing. So I guess at this point I have to decide if I want to keep it or get a Rezound or wait for another device that has a non-amoled screen. :/
  18. jkc120

    jkc120 Well-Known Member

    Found the avi of this same video and it's still there on that and even worse. I think the lower the resolution, the worse it'll appear since there are less pixels and they bleed together due to the lack of quality and pixels in the area.
  19. Appleanche

    Appleanche Active Member

    You're not understanding that the black levels on an AMOLED, and I'm pretty damn sure a Plasma TV (I'll be testing tonight at dark) will not hide the crappy quality like LCDs that just turn blacks into a blob.

    The artifacts exist in the video.

    I watched the Godfather opening scene in shitty quality on Youtube and a couple of other videos that are very dark scenes (End of the Aviator) there isn't a similar effect but I can see compression artifacts that the blacks hide in an LCD.
  20. jkc120

    jkc120 Well-Known Member

    I took these in a completely dark room at various brightness levels in mx player (full brightness, level 2-3, and then level 1). Level 1 is one step above NO brightness, so about as low as you can go and still see the darn video lol.

    Anyway, here are the pictures:

    Full brightness:
    http://i.imgur.com/6AXpY.jpg

    low brightness:
    http://i.imgur.com/C9k8b.jpg

    lowest brightness (1 step above):
    http://i.imgur.com/TABAo.jpg

    It's not just my eyes. :(
  21. jkc120

    jkc120 Well-Known Member

    Maybe it's just me, but I'd rather see a uniform area or blob than blue splotches jumping in and out. The blob looks WAY more real/less distracting. So people out there would rather view these artifacts instead of a uniform area? I guess at least for me I'm glad LCD hides this kind of stuff. And I guess it's pretty obvious my dinc was an SLCD screen, or I would have noticed this on there, right?
  22. nj02vette

    nj02vette Well-Known Member

    Crap. I just posted a thesis level post on this. And it must have dissappeared with the thread merge. :(

    Quick take is this is 100% codec and AMOLED related. The reason you don't see this on traditional LCD displays is because the noise gets washed out by the lower contrast. When the contrast is so high, you can see artifacts caused by lossy codecs. On good transfers, artifacts are minimized.
  23. jkc120

    jkc120 Well-Known Member

    Unfortunately, this really sucks then. Because the quality level of netflix shows this in almost every dark tv show/video I have tried. :(
  24. binary visions

    binary visions Well-Known Member

    Yessir.

    Posterization is not caused by the display, nor is it typically caused by the playback mechanism... it's almost always a codec issue. The codec is actually creating these artifacts because of the compression.

    Jack up the contrast on any compressed medium - highly compressed JPGs are a good example of this - and you'll see artifacts.
    jbdan and nj02vette like this.
  25. jkc120

    jkc120 Well-Known Member

    Well, I guess I just prefer a screen that hides these artifacts then. I realize this may be the norm for this screen technology and the encoding in use, but I prefer the look of an LCD screen where there may be some loss of clarity to seeing a bunch of bleeding/hosting artifacts. I just have to decide if this is enough to make me return it or not I guess. :cool:
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