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15th August 2009, 15:46 | #103 | Link | |
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When I open the MEGui Blu-Ray preset, the options are shown in the box. Code:
program --profile high --level 4.1 --preset fast --pass 2 --bitrate 8000 --stats ".stats" --thread-input --deblock -1:-1 --keyint 24 --min-keyint 2 --b-adapt 2 --direct auto --ref 1 --ipratio 1.1 --pbratio 1.1 --vbv-bufsize 30000 --vbv-maxrate 40000 --qcomp 0.5 --no-mbtree --me dia --subme 2 --partitions none --trellis 0 --no-mixed-refs --mvrange 511 --nal-hrd --sar 1:1--output "output" "input"
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Pirate: Now how would you like to die? Would you like to have your head chopped off or be burned at the stake? Curly: Burned at the stake! Moe: Why? Curly: A hot steak is always better than a cold chop. Last edited by Revgen; 15th August 2009 at 15:52. |
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15th August 2009, 16:17 | #104 | Link | ||
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15th August 2009, 16:20 | #105 | Link | |
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Pirate: Now how would you like to die? Would you like to have your head chopped off or be burned at the stake? Curly: Burned at the stake! Moe: Why? Curly: A hot steak is always better than a cold chop. |
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15th August 2009, 16:33 | #106 | Link |
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obvious that people do not read posts carefully so i make the table to make things be easier.
This setings are based on Blu-Ray specification and documentation not H264. btw. Max bframes = 3 if you use x264 as encoder then don't use B-pyramid because can broke DBP, but B-Pyramid is generaly alowed thing (Sonic Scenarist use it but automaticly decrase ref by one) mixed-refs is probably allowed, but some H264 developer better to answer because maybe can break DBP aslo? Mainconcept developer (Sergey) found that b-pyramid broke DBP in x264, maybe him know something about? EDIT: About GOP thing. Blu-Ray allow both Open and Closed GOP structure, for H264. Recommend GOP is min-max is 2-24 but everything from 1-30 can be used from both mix and max. Max value aslo depend how many b-frames used. If Bframes = 0 you can use anything from 1 to 30 for both min and max value if bframes = 1 min also can be 1-30 but max value can be 2,4,6,8,10,12,14,16,18,20,22,24,26,28,30 if bframes = 2 min 1-30, max 3,6,9,12,15,18,21,24,27,30 if bframes = 3 min 1-30, max 4,8,12,16,20,24,28,30 minimum 2 is recommended by authorung apps, 1 is fine too Last edited by shon3i; 15th August 2009 at 17:50. |
15th August 2009, 16:51 | #107 | Link | |
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I believe benwaggoner mentioned that from this thread
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Last edited by Chengbin; 15th August 2009 at 16:54. |
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16th August 2009, 02:28 | #108 | Link |
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^I've never had problems with X264's inloop filter overblurring details at Blu-Ray or HD-DVD resolutions and bitrates as long as it's at -1:-1 or less. Even at 0:0, it's hardly noticeable. Perhaps the AVC encoders they are using have substandard inloop filter implementation.
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16th August 2009, 09:05 | #109 | Link | |
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16th August 2009, 09:14 | #110 | Link | |
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That seems to explain it then.
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Pirate: Now how would you like to die? Would you like to have your head chopped off or be burned at the stake? Curly: Burned at the stake! Moe: Why? Curly: A hot steak is always better than a cold chop. Last edited by Revgen; 16th August 2009 at 09:16. |
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16th August 2009, 10:02 | #111 | Link | |
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16th August 2009, 21:58 | #112 | Link |
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I'm not sure if there are any public references to this fact, but I can confrim that this has long been standard practice in BD production for A-list titles. At NAB, a couple different BD encoder vendors were touting their ability to turn it off as a feature.
I don't know if it's default for all the tools, or as used by all compressionists. But many studio BD titles will have big sections where in-loop is off entirely. I also agree that this shouldn't be needed in theory, and am not sure how really needed it is in practice. Most professional optical disc compressionists don't have that much of a compression science background, and often keep using "best practices" established long ago, even if the reason for them has long since been addressed. There's plenty of exceptions to that rule. Most great Photoshop artists couldn't do a whiteboard calculation of the effect of cumulative 8-bit rounding errors. But they still end up with photos that look a lot better than mine . About three years ago I saw a then 10 year old Toshiba MPEG-2 encoder still being used for A-list titles! |
16th August 2009, 23:04 | #114 | Link |
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...which did make some sense in the early DVD era, since a progressive encode viewed on an interlaced display could have frequencies about Nyquist in 240 lines per field, resulting in some aliasing issues.
For which a vertical lowpass filter would make sense. However it seems the practice that emerged was to use a 0.3 pixel vertical blur. Which may have been tempting because it'd make compression a decent bit easier as well. There was quite a kerfuffle in the pre-launch days of HD DVD where we kept having to assure AVS Forum that we weren't encouraging that practice, and in fact did not include a vertical blur filter as part of PEP . Not that it would have been needed much even when playing back on a 1080i display, given that film sources are very rarely going to have any frequencies that high in a 1080 frame. My bias has long been to optimize for those who have good, well-calibrated displays, since by definition they're the ones who cared about quality, and have earned it. We certainly need to make sure things don't stink on consumer displays, but the most accurate experience should be achieved by the most accureate calibration. |
17th August 2009, 00:23 | #115 | Link |
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I totally agree with your last paragraph - aiming high instead of the lowest common denominator is the way to go, because like you say, the people who have the equipment that creates such issues probably won't even notice or care about them anyway.
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17th August 2009, 02:00 | #116 | Link | |
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How soon do you think you can get these up, Ben? |
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17th August 2009, 08:21 | #120 | Link | |
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My expectation is that Level 4.0 would reach quality saturation with x264 for large classes of content, particularly 1080p24. Full-frame 1080i30 would be the most likely exception, particuarly highly detailed and fast-motion stuff like sports shot with fast shutter speeds. Before we ask the x264 devs to tackle the apparently challenging and otherwise not broadly useful work to get slicing added back in, there probably should be some clear samples of where Level 4.1 would offer a percetible quality advantage over Level 4.0 as currently supported. |
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authoring, blu-ray, compliant, verified, x264 |
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