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11th October 2019, 08:43 | #7101 | Link |
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What are the basis for that statement? The lower clocked 3700X is on par or faster then 9900k at the same amount of threads. First and second gen wasnt that strong per thread, but that is much cause of avx speed and other cpu-design causes. And I have recieved several Epyc 7402p servers, no issue there either, blazing fast.
Last edited by excellentswordfight; 11th October 2019 at 08:52. |
11th October 2019, 12:43 | #7102 | Link | |
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How much bigger bitrate you get with AQ1 vs AQ2? |
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11th October 2019, 14:06 | #7103 | Link | |
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Last edited by mandarinka; 11th October 2019 at 14:14. |
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12th October 2019, 09:49 | #7104 | Link |
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I think that's because in AQ1 the aq-strength for all frames is the same, while AQ2 uses auto-variance, and x265 applies separate aq-strength for each frame (based on complexity).
At least on paper AQ2 sounds better to me and it is now the default. One would hope the devs switched to that for a good reason (i.e it's not just slightly faster but also gives a better result). Last edited by mini-moose; 12th October 2019 at 09:51. |
12th October 2019, 10:52 | #7105 | Link |
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There seems to be a lot of discussion about AQ mode 1 vs 2.
When it comes to 4k HDR encodes what I found is that with mode 2 the Average QP result is in average 1 higher in mode 2. For example mode 1 is 21.33 and mode 2 is 22.15. I have measured the vmaf values of quite a few 4k HDR encode cuts, and not in one single instance has the vmaf score been worse on the aq mode 2 encode. Every single time the vmaf value is higher on the aq mode 2 encode. Yes, the file size is smaller, and the average QP a bit higher. The switch from aq mode 1 to aq mode 2 must have been made for a reason. If mode 2 gives worse quality than mode 1, why would the devs change the default. Either the devs knows nothing about qhat they are doing, or the actually know what they are doing. All I can say is that I am yet to find a mode 1 encode with a higher vmaf score than the identical mode 2 encode. rco133 |
13th October 2019, 11:09 | #7106 | Link |
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But have you made any visual comparisons? In my old tests, I found out that mode 2 causes problems in flat backgrounds.
Many of the changes in the default values have been made without any explanation, so we don't really know what the use case for each of them has been. I sometimes feel that many settings are based on squeezing everything out of the material with the least possible amount of bits, even if it means oversmoothing etc. which can then be irritating to others (like me).
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13th October 2019, 12:52 | #7107 | Link | |
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I usually use aq-strength 0.8 and I'm thinking should I raise it to 0.9 or even 1.0? Last edited by redbtn; 13th October 2019 at 13:35. |
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13th October 2019, 14:34 | #7108 | Link | |
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The encoder has probably gone through many changes so I would need to test things before doing any HDR encodes. But those would be a good starting point.
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13th October 2019, 15:40 | #7109 | Link | |
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I'll try to use strength 1.0, but I did some tests and it raise bitrate by 10-11%. |
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13th October 2019, 16:27 | #7110 | Link |
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Yes, CRF 13 is probably quite low for UHD because any problems arising from too few bits will not be as apparent on a 4K TV as with 1080p and lower where they are enlarged during playback.
With aq-strength, you could probably go down to 0.8 or so with grainy sources as grain tends to attract bits anyway, so the flat parts of the image will not look bad.
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14th October 2019, 16:27 | #7111 | Link | |
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It'd probably take something like Wireshark to figure out what is being used in other cases. In the adaptive streaming world, there can be dozens of encoded variants of a given title, in different frame sizes, bitrates, DRM, and codecs. As a wild personal guess, I'd expect a lot more premium content is delivered in HEVC than in VP9+AV1. The On2 stuff has always been most focused on browser-based user generated content without DRM, and there aren't any AV1 HW DRM + decode products in the market, or even announced. As for quality versus speed, At the same encoding speed, x265 beats x264 in the cases I've tested in the last couple of years. Sure, it doesn't take full advantage of what HEVC can do, but it's still better for most content (there are likely edge cases with a lot of grain). The fastest possible x264 will be faster than the fastest possible x265, of course. x265 and HEVC in general takes better advantage of AVX, multithreading, and 64-bit than x264, so the newer the processor, the better quality @ perf HEVC has. |
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16th October 2019, 13:54 | #7112 | Link | |
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Last edited by sonnati; 16th October 2019 at 13:57. |
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16th October 2019, 21:29 | #7113 | Link |
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x265 v3.2+7-37648fca915b (32 & 64-bit 8/10/12bit Multilib Windows Binaries) (GCC 9.2.0)
Code:
https://bitbucket.org/multicoreware/x265/commits/branch/default |
16th October 2019, 21:52 | #7114 | Link | |
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16th October 2019, 21:57 | #7115 | Link | |
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Skickat från min SM-G975F via Tapatalk
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19th October 2019, 16:33 | #7116 | Link | |
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Quote:
https://upx.github.io/
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19th October 2019, 18:18 | #7117 | Link | |
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19th October 2019, 18:30 | #7118 | Link |
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Basically drag and drop
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19th October 2019, 18:47 | #7119 | Link |
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