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30th December 2022, 18:37 | #63 | Link | |
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3rd January 2023, 18:56 | #64 | Link | |
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Raising --psy-rd and --psy-rdoq some can help. Try 3 for each as a starting point. --ctu 32 for sure The built-in --nr-inter and --nr-intra aren't particularly advanced denoising filters, but as they operate at the quantization phase, can offer bigger compression efficiency benefits than other methods. Start with something like --nr-intra 100 --nr-inter 400. --nr-intra is a spatial denoising filter and --nr-inter is temporal, which is why we use a good multiple higher as film grain is all temporal. |
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4th January 2023, 19:52 | #65 | Link | |
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Does it just give more control over each block? Would this increase bit-rates? Thanks. |
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5th January 2023, 19:16 | #66 | Link | |
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As with tskip, it has a mode where it can be useful, but use less resources with --tskip-fast. If use rskip, are 0, 1, and 2 just less and less levels of rskip, or are they completely different rskip modes meant for different content? What really asking, is there an rskip-fast like the tskip-fast, because it's extremely useful. I wanted to ask a bit more about aq-mode=3 and aq-strength. I believe aq-strength ranges from 0 (off) to 3 (full), But, when you set aq-strength to 3 what is that really doing? Is it trying to place 100% of it's bit-rate in darker areas? Or is there a cap even when set to 3 that only, say, 25% of it's bit-rate looks fo darker content? ----Lets just say it looked for 25% of it's bit-rate to be added in dark areas. If I lower aq-strength from 3 to 1.5, would that mean it it not distributes 12.5% of it's bit-rates into dark areas? I'm just trying to understand how aq-strength works in relation to aq-mode 3. Thanks. |
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6th January 2023, 23:59 | #67 | Link |
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All your questions and more are answered at: https://x265.readthedocs.io/en/master/cli.html
It specifies the data type of each parameter. For --rskip, --rskip 2 is the mode you want to use (deprecating the older, poor at grain default --rskip 1). You control speed/quality tradeoff with --rskip 2 with the --rskip-edge-threshold parameter. Lower values are slower but more accurate. The default is 5, and I like to use 2-3 for high quality encoding. I'm not aware of any methods to estimate the bitrate impact of different --aq-modes, as they are quite content dependent. |
10th January 2023, 23:06 | #68 | Link | |
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28th January 2023, 18:10 | #69 | Link | |
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With all the settings I'm using to pull out as much detail as possible using x265. One setting that Ive forgot about is cu-lossless. Can this help pull out more detail in grain and fine particles? |
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1st February 2023, 00:39 | #70 | Link | |
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I've never found a real-world scenario where --cu-lossless would be useful for a distribution encode. Perhaps for a mezzanine file. --tskip should capture most or all of the value at a much lower performance hit. There's no --cu-lossless-fast equivalent to --tskip-fast. |
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22nd February 2023, 05:19 | #71 | Link | |
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I appreciate the feedback. |
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24th February 2023, 18:42 | #72 | Link | |
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4th March 2023, 23:06 | #73 | Link | |
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You may not be getting any benefit from --tskip either. It can help with noise-free credits in grainy movies, but isn't going to be useful for any CU with significant random noise. It's pretty hard to simply spend more compute to make grainy content look better than --preset slower. What improves grain is using the --nr-i* features, lowering ipratio and pbratio, and other things that are more qualitative tuning, not just more expensive modes. |
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21st March 2023, 04:22 | #74 | Link | |
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4th May 2023, 16:28 | #75 | Link | |
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Would going lower than this be viable? Have you ever done that? Also, based on the cut size, does this effect tu-intra-depth and tu-inter-depth? From my understand, tu-intra-depth and tu-inter-depth are how small into the details the encode goes, is that correct? So for fine details, film grain and things like that tu-intra-depth=4 and tu-inter-depth=4 would typically be better. Does using ctu=32 effect the size of the intra depth and inter? |
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6th May 2023, 07:51 | #76 | Link | ||
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6th May 2023, 18:24 | #77 | Link |
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They are relative to TU. The default TU should be the same as CTU as per the docs, but it actually is 32 unless CTU is lower. 32 is enough to use depth 4. I use CTU 32, TU 32, depth 4 in my encodes.
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8th May 2023, 04:04 | #78 | Link | |
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In theory can CTU=32 grab more detail than 64? I might just run some tests for even lower than 32 just to see it. |
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8th May 2023, 05:03 | #79 | Link | |
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There is also something strange happening with CTU 64 + limit-tu 0 + rskip 2 and MultiCoreWare just ignored the report. I don't trust that it wouldn't appear also in other cases. CTU 32 doesn't have it. https://forum.doom9.org/showthread.p...A0#post1919347
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8th May 2023, 09:23 | #80 | Link | ||
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