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17th August 2018, 11:58 | #6281 | Link |
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x264 has a good optimization option
--tune film [--deblock -1:-1 --psy-rd <unset>:0.15] why not have the same for x265 ? --tune film [--no-sao --no-strong-intra-smoothing --psy-rd 4] Last edited by zub35; 17th August 2018 at 12:00. |
17th August 2018, 14:09 | #6282 | Link | |
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now... why does everyone think it's a good idea to switch off Sample Adaptive Offset in-loop filter? i read about it and it sounds like a nice feature to improve efficiency - no matter what kind of video content is encoded. i understand that there was supposely a little problem in the early stages of x265 with sao integration. but is this still a thing or is everybody just blindly turning off sao? |
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17th August 2018, 14:36 | #6283 | Link | |
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17th August 2018, 16:51 | #6284 | Link | |
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i did some visual comparisons lately but wasn't able to detect any kind of differences at high bitrate - i didn't look at still images, only at video scenes. at very low bitrate (300kbit/s) there was a lot of quality differences with different parameters, but I didn't look at no-sao... so probably i'm just a bad quality judge. |
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17th August 2018, 17:58 | #6285 | Link | |
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18th August 2018, 16:56 | #6286 | Link | ||
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They are all Intel fans or worse fanboys. Even the developers.
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Win 10 x64 (19042.572) - Core i5-2400 - Radeon RX 470 (20.10.1) HEVC decoding benchmarks H.264 DXVA Benchmarks for all |
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18th August 2018, 20:32 | #6288 | Link | |
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Some consumers are moving to AMD, but the majority of businesses are using Intel Xeon CPUs (my company included), so that's what they ask for optimizations. They are simply following the market needs, nothing more. |
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20th August 2018, 16:15 | #6289 | Link |
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x265 v2.8+66-88ee12651e30 (32 & 64-bit 8/10/12bit Multilib Windows Binaries)
Code:
https://bitbucket.org/multicoreware/x265/commits/branch/default Last edited by Barough; 20th August 2018 at 16:25. |
21st August 2018, 00:49 | #6290 | Link |
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That's not surprising. Something like --preset slower would probably be better, but there's only so much threading that can be usefully done in a single instance, and Blu-ray restrictions reduce even that (b-frames can encode in parallel, but BD only allows 2 consecutive). Increasing -F will help, but high values can cause rate control issues.
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21st August 2018, 15:22 | #6292 | Link | ||
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I have found sao to be usefull for both animation and low bitrate content though (as expected). Quote:
But I still think Atak question is valid, does 2990wx need any NUMA tweaking to perform correctly? Last edited by excellentswordfight; 21st August 2018 at 15:42. |
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21st August 2018, 16:27 | #6293 | Link | |
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i will do some more visual tests with high and low bitrates and only film content. maybe i can finally understand all your motivation to turn off sao. update: wow. so I did a quick test @6000/1000/100 kbit/s with and without sao. so you are 100% right. no-sao looks just much sharper and retains more details. even I can see it... not just true on high bitrate but also on medium/low bitrate. but I can understand why it would make kinda sense to have a smooth low bitrate encoding. so basically i'm sorry for not believing, need to change my presets now. lol Last edited by RieGo; 21st August 2018 at 17:56. |
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21st August 2018, 21:51 | #6294 | Link | |
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22nd August 2018, 03:01 | #6295 | Link | ||
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Sure. UHD HDR10 BD50: Code:
x265.exe --y4m - --dither --preset medium --level 5.1 --tune fastdecode --no-high-tier --ref 4 --profile main10 --bitrate 75000 --deblock -1:-1 --hdr-opt --hrd --min-luma 64 --max-luma 940 --chromaloc 2 --range limited --videoformat component --colorprim bt2020 --transfer smpte2084 --colormatrix bt2020nc --master-display "G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,0.0050)" --max-cll 1000,400 --overscan show --no-open-gop --min-keyint 1 --keyint 24 --repeat-headers --rd 3 --vbv-maxrate 75000 --vbv-bufsize 75000 --asm=avx2 --wpp -o "H:\raw_video.hevc" Still, using --preset slow might help a bit, but I would have to specify parameters myself, especially 'cause I'm not using --uhd-bd and I would end up by limiting myself anyway. Increasing --ref from 4 to 6 might also help. As to the 75Mbit/s, the specs require the bitrate to stay below 82Mbit/s, but 75Mbit/s plus a bit of oscillation up and down and audio tracks is gonna be fine. Last edited by FranceBB; 22nd August 2018 at 03:08. |
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22nd August 2018, 14:53 | #6298 | Link | |
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with 4k content everything is fine even without pmode. i didn't really make any extensive speed tests though. Last edited by RieGo; 22nd August 2018 at 15:00. |
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22nd August 2018, 21:55 | #6299 | Link | |
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Pmode can also theoretically increase quality a bit, since a lot of its parallel work is stuff that would normally have gotten skipped due to early exit. Occasionally it’ll find something better than what was found before the early exit. I’ve never seen it really make a material difference compared to veryslow or placebo. |
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22nd August 2018, 22:32 | #6300 | Link | |
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maybe it's a good idea for me to just remove it. but going to slower is not an option (for me) - slow -> slower almost increases encoding time 100% Last edited by RieGo; 22nd August 2018 at 22:34. |
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