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22nd October 2018, 04:07 | #6461 | Link |
Pig on the wing
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I ran the encodes again to produce the logs, if you want to have a look: https://drive.google.com/open?id=1Ej...nsPbY8qyl6tFMA . The flat part scene I mentioned appears several times, for example frames 0-117 contain that one.
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27th October 2018, 12:30 | #6462 | Link |
Pig on the wing
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This is probably a silly question, but here goes anyway: if I use --hdr-opt, do I need to feed the encoder with 10-bit data or is 16-bit data as good if the source is a standard UHD with HDR? I always process things in 16-bit domain and let the encoder dither down to 10 bits.
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And if the band you're in starts playing different tunes I'll see you on the dark side of the Moon... |
27th October 2018, 22:44 | #6465 | Link |
Software Developer
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28th October 2018, 01:35 | #6466 | Link | |
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Quote:
If you’re changing bit depth in x265, remember to always use —dither. |
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28th October 2018, 09:25 | #6468 | Link |
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Join Date: Jun 2018
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It seems that even zeranoe ffmpeg stays at x265 2.8 for a long time.
By the way, I'm not a fan of hard-coded dithering. Dithering should be handled as part of creative editing before the encoding process or left to the rendering after the decoding process. |
29th October 2018, 11:11 | #6469 | Link | |
Broadcast Encoder
Join Date: Nov 2013
Location: Royal Borough of Kensington & Chelsea, UK
Posts: 2,905
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Quote:
In a nutshell, let x265 do the dithering and always pipe to it the highest bit depth you have, unless you like a specific dithering method and you have enough bitrate. |
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29th October 2018, 18:31 | #6470 | Link | |
Moderator
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Location: Portland, OR
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Quote:
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31st October 2018, 00:08 | #6471 | Link |
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Join Date: Jan 2006
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Say, does anyone have any data showing potential benefits of using some of the "beyond placebo" settings?
For example
I've fond some value in very low bitrates or unusual content from all but the higher subme and me, which I've not tried. --me sea in particular cuts speed enormously. Tskip and cu-lossless can help with anime, small text, screen captures, and other stuff with sharp detailed edges. |
31st October 2018, 11:29 | #6472 | Link | |
Registered User
Join Date: May 2009
Posts: 184
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Quote:
In x264, --subme 6 upwards have increased levels of RDO. But seems that RDO is its own separate thing in x265 with RD levels 1-6 and rd-refine being a separate switch too. |
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31st October 2018, 17:08 | #6473 | Link | ||
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Quote:
From x265.readthedocs.io Quote:
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31st October 2018, 20:39 | #6474 | Link | |
VP Eng, Kaleidescape
Join Date: Jan 2018
Location: Mt View, CA
Posts: 51
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Quote:
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1st November 2018, 05:10 | #6477 | Link | |
Moderator
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Quote:
I have seen visible and measurable value from ref 6, bframes 16, and tskip at <150 Kbps. Of course, using a lot of MIPS/pixel isn’t nearly so painful at low frame sizes and bitrates. |
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1st November 2018, 10:27 | #6478 | Link | ||
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Join Date: May 2009
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Quote:
But in x264 it's :- Quote:
So it seems to me that --subme in x265 is as per --subme 1-5 in x264. And the RD stuff of x264 --subme 6-11 is branched off into it's own thing in x265 with selectable RDO levels, rd-refine as a separate option etc. |
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2nd November 2018, 12:59 | #6479 | Link |
German doom9/Gleitz SuMo
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Location: Germany, rural Altmark
Posts: 6,784
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x265 2.9+4-471726d3a046
fixes: rowStat computation in const-vbv; memory reset size in dynamic-refine; linking issue on non x86 platform |
4th November 2018, 19:33 | #6480 | Link | |
Registered User
Join Date: Aug 2014
Posts: 50
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Quote:
1) imo, if you care about things that move, (and picture quality in general), you have to use sub-motion pixel subme 7. 5 is good, and is as low as I ever set that even on files I'm trying to finish fast, but 5 is easily visually inferior to 7 imo. 7 of course takes longer to encode though. I'm usually around CRF 22-23 (with nearly all quality settings turned on). It probably has lesser effect at CRF 18. Last edited by Dclose; 4th November 2018 at 19:36. |
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