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2nd September 2021, 21:17 | #1501 | Link |
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So all fansubber?
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3rd September 2021, 12:05 | #1502 | Link |
Broadcast Encoder
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ROTFL
I've seen fansubber doing that in the 2006-2008 era. Madness... and far too much free time those youngsters had back in the days... (and I was "guilty" of being one of them back in the days :P ) |
9th September 2021, 15:41 | #1503 | Link |
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Even back when some anime nerds did do "manual" IVTC, they never actually went through every frame one by one. The typical workflow in tools like YATTA and its successors was to use pattern guidance; that is find sequences of frames with a consistent 3:2 cadence and then generate an override file for those sequences that forced that pattern. When you were lucky you only had like 3-4 pattern breaks for an entire episode (e.g. it was produced as progressive and telecined very late in the production process); if you were unlucky you had hundreds, but that's still far short of looking at every frame.
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11th September 2021, 19:52 | #1504 | Link | |
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LOL no. Interlacing is a mathematically very unique phenomenon that has nothing to do with image-recognition or any other human visual system bullshit. The key characteristic that makes it incredibly easy to distinguish from normal detail is that non-adjacent pixels are more similar to each other than adjacent pixels. In particular, for any given column of five pixels A, B, C, D, and E:
- pixels B and D will be more similar to each other than either one is to A, C, or E; and - pixel C will be more similar to A and E than it is to B or D This is literally all you need to distinguish interlacing from detail or from noise. If the problem seems "difficult", it's because certain people are ignoring differences between non-adjacent pixels and dicking around with multiplication and arbitrary user-defined threshold parameters, as if they were just copying and pasting from edge-detection algorithms. Hell, neither of TFM's combing metrics even bother to look at the differences between A and B, or between D and E, and Metric 1 doesn't bother looking at pixels A or E at all. Quote:
Macroblocks have nothing to do with deinterlacing because deinterlacing filters don't work on encoded video. They work on decoded video, which is a bunch of individual pixel values.
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12th September 2021, 12:04 | #1505 | Link |
Broadcast Encoder
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By motion vectors I mean newly created Vectors to find differences on an uncompressed AV Stream frameserved by Avisynth. Vectors are created from scratch trying to compare blocks temporarily and thus finding out repeating patterns (this is how TDecimate gets rid of telecine for instance) but sometimes this doesn't work well and I've already explained why...
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12th September 2021, 12:57 | #1506 | Link |
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If only we had some coders that were as brilliant as Katie, wouldn't that be something.
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15th September 2021, 06:19 | #1507 | Link | |||
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Quote:
Quote:
Quote:
I'm not good at that. I'm better at correcting stupid ideas before they reach the "translated into code" stage.
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I ask unusual questions but always give proper thanks to those who give correct and useful answers. Last edited by Katie Boundary; 15th September 2021 at 06:21. |
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15th September 2021, 10:55 | #1508 | Link |
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So don't forget to consider all the possible kinds of motions that could appear in a video. There is not only "uniform linear horizontal", although it may be the most common. I am pretty sure one can find "academic examples" of motion which does not clearly calculate to lower differences for non-adjacent lines (like even pixel wide vertical).
I remember a more or less entertaining approach of (IIRC?) HDConvertToX: Let x264 encode a tiny crop one time with --tff and another time with --bff, and compare the resulting statistic outputs... |
15th September 2021, 13:01 | #1509 | Link | |
Broadcast Encoder
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Quote:
That's exactly what I was trying to tell her... It's not "that easy" nor "that simple" as she stated. Anyway, I'm not gonna reply any further, I feel like I can't get my message through, but after all, I've always been terrible in talking with women even when it was weather-related chit-chat, let alone about encoding xD Last edited by FranceBB; 15th September 2021 at 13:05. |
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15th September 2021, 16:55 | #1510 | Link | |
Formerly davidh*****
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Quote:
Besides, there's more to it than simply deciding (imperfectly) whether or not an individual pixel is "interlaced". There's no perfect solution to this problem. Any attempt will involve compromises. If you haven't even implemented your solution, how do you know it's better than any other? |
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16th September 2021, 01:22 | #1513 | Link |
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Unless it's around a scene change. Or it's a fade. Or there's literally any other change in the image that isn't caused by motion (someone turns a light on, for example).
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16th September 2021, 02:44 | #1514 | Link |
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Sure, those qualify as "motion between fields" too. But you made the false claim that motion has nothing to do with interlacing. What matters is whether the picture content changes across a field pair. Real motion is certainly a major instance thereof, and that explains why motion-adaptive methods can work better.
Last edited by videoh; 16th September 2021 at 02:48. |
16th September 2021, 09:57 | #1515 | Link |
German doom9/Gleitz SuMo
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"Interlacing" means that two fields of a frame have been shot at different moments of time. If there is no motion, there is no difference to a progressive frame. "Combing" (while watching a whole frame) gets only visible for areas in motion because their content has different locations at different moments of time.
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16th September 2021, 10:08 | #1516 | Link | |
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Quote:
EDIT: Or do I mean pass, or even Indeterminate.
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I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 16th September 2021 at 10:14. |
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18th September 2021, 03:36 | #1517 | Link | |
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Linguists and physicists, and pretty much the entire english-speaking world, disagree with you.
There was nothing false about it. You can have motion without interlacing (it's called "progressive" video) and I already gave several examples of visible interlacing without motion. Quote:
Or if the picture changes for any other reason.
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18th September 2021, 12:14 | #1519 | Link | |
Formerly davidh*****
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Quote:
You might as well claim that there is no such thing as motion in a video at all, because it's just a collection of pixels changing over time. Last edited by wonkey_monkey; 18th September 2021 at 15:39. |
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