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11th July 2018, 11:43 | #6181 | Link | |
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Yeah I do that anyway as I always make quite a few tweaks to the standard presets. But what if I want to specify --rd 3 only for the fast 1st pass but use --rd 5 for the slow 2nd pass? My thoughts are that --rd 3 will provide a much more suitable analysis than --rd 2 for the 1st pass and use psy-rdoq. |
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11th July 2018, 13:37 | #6183 | Link | |
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Would it be :- x265 --preset slow --no-slow-firstpass --pass 1 --ref 4 --rd 3(or 5) --pass 2... followed by the remainder of my manually set options. |
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11th July 2018, 13:45 | #6184 | Link |
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No. You have to complete the 1st pass before you run the 2nd.
So first, run Code:
x265 --preset slow --pass 1 --no-slow-firstpass --ref 4 --rd 3 ... Code:
x265 --preset slow --pass 2 --ref 4 --rd 5 ... |
11th July 2018, 15:46 | #6185 | Link |
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An interesting article about compression/performance ratio of x265's presets
http://x265.org/performance-energy-c...analysis-x265/ |
11th July 2018, 21:28 | #6186 | Link | |
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12th July 2018, 12:19 | #6187 | Link | |
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I feel quite confirmed in my personal findings, i.e. --preset slow being the sweetspot for great quality at a still reasonable encoding speed, since the jump to slower is already immense, while the benefit to quality is practically non-existent in my eyes. |
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12th July 2018, 12:43 | #6188 | Link |
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There's also at least the value of --max-merge being raised in the slower presets which (at least in my opinion) affect by degrading quality. It will smooth things more --> lower bitrate.
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12th July 2018, 16:15 | #6189 | Link | |
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So a no-slow-firstpass should focus on features that don’t have highly variable impact based on content. Things looking different is probably a good proxy for that, so if you see max-merge changing the character of the encore significantly, you’d probably want to have it st the same value in both passes. |
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13th July 2018, 17:34 | #6190 | Link |
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Hi, thanks to all the developers.
UHD-BD are encoded at level 5.1 but when I select that level, I get this warning. Should I ignore the warning or just use 5.0 which isn't uhdbd compliant ? Also, is there anything in my setting that I should modify in order to retain grain better? Thank you and sorry for my English |
13th July 2018, 19:52 | #6192 | Link | |
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EDIT. Wow its working well . still not perfect but way better than before. http://screenshotcomparison.com/comparison/116849 http://screenshotcomparison.com/comparison/116846 http://screenshotcomparison.com/comparison/116847 and never mind about my first question, added --vbv-bufsize 160000 --vbv-maxrate 160000 and no more warning. Last edited by imhh11; 13th July 2018 at 23:43. |
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14th July 2018, 09:56 | #6194 | Link | ||
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14th July 2018, 09:58 | #6195 | Link | |
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For better quality including grain retention, I also recommend testing raising qcomp. Try values between 0.6 and 0.8. The bitrate will rise as well though.
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14th July 2018, 17:56 | #6196 | Link | |
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Thank you so much for your recommendations, I'm already blown away by the difference. |
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14th July 2018, 22:50 | #6197 | Link |
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Hello Dudes,
I have tried to encode a video... From 5 mins and on, the quality is getting worse and worse steadily(it is like auto crf downgrade). and then I split the source video into pieces and encoded them again. Every outputs are good then. with the same params, I dont know why...... I suspect "--psy-rd 3.2" is the cause or it is a bug?......Or some wrong commands-combinations cause the chaos... Cheers. --crf 18.6 -m 2 --me 1 --rd 5 --rc-lookahead 120 --merange 114 --bframes 6 --ref 6 --min-keyint 23 --keyint 240 --max-merge 5 --tu-intra-depth 3 --tu-inter-depth 2 --aq-motion --qg-size 16 --no-sao --no-strong-intra-smoothing --psy-rd 3.2 --scenecut 80 --deblock -1:3 --aq-mode 2 --qcomp 0.8 --aq-strength 0.8 --colorprim bt709 --colormatrix bt709 --transfer bt709 --input-res 1862x768 --fps 24000/1001 --input-depth 10 -D 10 -o "1" --rc-grain --input - Last edited by uneedme; 14th July 2018 at 23:11. |
20th July 2018, 15:36 | #6199 | Link |
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x265 2.8+47-e2759ae31c36
several fixes related to HDR10+ LLC JSON and dependencies between effects of options |
20th July 2018, 15:40 | #6200 | Link |
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I've got some 60fps video materials with wrongly encoded frame-rate which has lots of duplicated frames.
Encoding those video tends to exceed the bits per second budget. 1. remove duplicated frame 2. increase qcomp 3. set tu-inter-depth=4:tu-intra-depth=4 The 1. and 2. don't perform well, those "still" frames seems to compromised by the poorly unstable sampling rate and ghosting artifacts. The 3. is interesting. Instead, how to set x265 parameters to act just like a corrected frame-rate video but farther Intra-coded (I) frames and high level hierarchy Bi-directional predicted (B) frames? |
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