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6th March 2023, 10:14 | #9042 | Link | |
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I use --aq-mode 4 for SDR, but not sure about HDR. |
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7th March 2023, 21:18 | #9044 | Link |
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I recently started to use --aq-mode=4 for everything. It has been said --aq-mode=4 is for "videos with high edge contents (Ex: Ducks take off, Crowd run, Raindrops etc)". (1) And because this can happen in every video, I use 4 now with every kind of video. I've noticed that the encoding time is reduced for --aq-mode=4 compared to --aq-mode=2. I also visually like the result better (HDR and SDR).
(1) https://www.mail-archive.com/x265-de.../msg11661.html |
8th March 2023, 17:30 | #9045 | Link | |
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It's also possible that the --auto-aq mode isn't optimally tuned for HDR content; I've not tested with the feature myself. |
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16th March 2023, 16:59 | #9048 | Link |
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Hello,
I noticed that a trouble took place when someone was trying to use --rd-refine in order to encode videos with better quality and smaller size. I wonder if that could been solved as they thought. https://bitbucket.org/multicoreware/...glitch-in-some https://github.com/Mr-Z-2697/x265-Yu...ment-103498859 Last edited by ksks; 16th March 2023 at 17:54. Reason: grammar |
16th March 2023, 17:55 | #9049 | Link |
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I just noticed today is the 2nd anniversary of x265 3.5.
We've never had even a one year gap from releases before now. I hope a 3.6 is coming before long. There have been quite a few new features and fixes it would be nice to have in a official build. |
17th March 2023, 21:38 | #9052 | Link |
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I have ryzen 7900x cpu with nvidia rtx 3060ti, which version should i use? what is the best website to get these up to date binaries from?
also, any specific cli commands regarding my cpu which can increase performance? |
18th March 2023, 10:39 | #9053 | Link |
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The GPU does not matter at all for x265.
The CPU supports AVX2 which any x265 build for an intel/AMD compatible CPU will detect and use automatically. It also supports AVX512 what you would have to enable by a command line parameter, but it will heat up the CPU a lot more and may get its clock rate throttled, so it may be faster or not, but will be a risk for reliability. The most important core functions of x265 have CPU optimizations in several variants. There are also builds out there which are further optimized in rarely used functions, so their gain will probably be negligible. It is probably much more important to find a sane balance between multithreading of prefiltering (in AviSynth or VapourSynth or whatever conversion system you prefer) and multithreading in x265, to utilize all the cores without severe bottlenecks. |
20th March 2023, 23:51 | #9056 | Link |
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What aq-strength does is baed on the --aq-mode being used. Generally aq-modes are about preventing blurring in smoother areas caused by more naive PSNR or SAD type metrics. In general x265 will spend fewer bits on areas of high motion that aren't good references for frames later in the GOP; --cutree is the main tool to identify those. This results in adaptive quantization, absolutely, but not directly controlled by --aq-mode or --aq-strength. I'm sure there are some interactions in practice, as all kinds of things can change how x265 allocates bits.
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20th March 2023, 23:52 | #9057 | Link |
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That is going to be some old hardware. It wouldn't take that many compressed titles before it'll be cheaper on electricity to buy a newer, faster, and much more efficient CPU. The fastest pre-AVX CPU probably will have <10% the throughput of a modern enthusiast chip, which will have many more cores, AVX2, and overall better instructions per clock.
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21st March 2023, 02:16 | #9058 | Link | |
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21st March 2023, 07:24 | #9059 | Link | |
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You might get some performance benefits from compiling the executable with specific tuning for your CPU. Media Autobuild Suite can do this, there is a possibility to tweak the compiler parameters accordingly (-march and -mtune in specific). https://github.com/m-ab-s/media-auto...nal-user-files
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