• Hybrid version 2018.04.08.1
  
• The psyrdoq value of a x265 encoder file is always 0.00 when the value was set as 1.00.
  

Quote:Psy-RDO Quantization:
PsyRDO quantization will adjust the distortion cost used in rate-distortion optimized quantization (RDO quant) favoring the preservation of energy in the reconstructed image. This generally improves perceived visual quality at the cost of lower quality metric scores.

At low strength levels, psy-rdoq will influence the quantization level decisions, favoring higher AC energy in the reconstructed image. As psy-rdoq strength is increased, more non-zero coefficient levels are added and fewer coefficients are zeroed by RDOQ’s rate distortion analysis. High levels of psy-rdoq can double the bitrate which can have a drastic effect on rate control, forcing higher overall QP, and can cause ringing artifacts. psy-rdoq is less accurate than psy-rd, it is biasing towards energy in general while psy-rd biases towards the energy of the source image. But very large psy-rdoq values can sometimes be beneficial, preserving film grain for instance.

Note:
It's get's enabled for --rdoq-level 1 and above.

(command line match: --psy-rdoq X, X from 0-50.0; default: --psy-rdoq 1.0

Quote:--rdoq-level <0|1|2>, --no-rdoq-level

Specify the amount of rate-distortion analysis to use within quantization:

At level 0 rate-distortion cost is not considered in quant

At level 1 rate-distortion cost is used to find optimal rounding values for each level (and allows psy-rdoq to be effective). It trades-off the signaling cost of the coefficient vs its post-inverse quant distortion from the pre-quant coefficient. When --psy-rdoq is enabled, this formula is biased in favor of more energy in the residual (larger coefficient absolute levels)

At level 2 rate-distortion cost is used to make decimate decisions on each 4x4 coding group, including the cost of signaling the group within the group bitmap. If the total distortion of not signaling the entire coding group is less than the rate cost, the block is decimated. Next, it applies rate-distortion cost analysis to the last non-zero coefficient, which can result in many (or all) of the coding groups being decimated. Psy-rdoq is less effective at preserving energy when RDOQ is at level 2, since it only has influence over the level distortion costs.

Quote:Apply a preset whose default psyrdoq value is 1

(12.04.2018, 20:33)Selur Wrote:

Quote:Apply a preset whose default psyrdoq value is 1

Can you tell me one?
Because looking at: http://x265.readthedocs.io/en/default/presets.html#presets
There isn't a preset which sets '--psy-rdoq'.
So applying any preset will set  '--psy-rdoq' will set 'psy-rdoq' to the default value which is 0.0:

  --[no-]psy-rdoq <0..50.0>     Strength of psycho-visual optimization in RDO quantization, 0 to disable. Default 0.0

-> Still can't reproduce the issue.
But, I stumbled over some code which might cause your issue,..

Cu Selur

Quote:I did read the Preset Option page before I submit this issue, and I thought maybe they just didn't list all the detail parameters in that page? since

(14.04.2018, 09:11)Selur Wrote:

Quote:I did read the Preset Option page before I submit this issue, and I thought maybe they just didn't list all the detail parameters in that page? since

Looking at the source code:

if (preset)    {        char *end;        int i = strtol(preset, &end, 10);        if (*end == 0 && i >= 0 && i < (int)(sizeof(x265_preset_names) / sizeof(*x265_preset_names) - 1))            preset = x265_preset_names[i];        if (!strcmp(preset, "ultrafast"))        {            param->lookaheadDepth = 5;            param->scenecutThreshold = 0; // disable lookahead            param->maxCUSize = 32;            param->minCUSize = 16;            param->bframes = 3;            param->bFrameAdaptive = 0;            param->subpelRefine = 0;            param->searchMethod = X265_DIA_SEARCH;            param->bEnableEarlySkip = 1;            param->bEnableSAO = 0;            param->bEnableSignHiding = 0;            param->bEnableWeightedPred = 0;            param->rdLevel = 2;            param->maxNumReferences = 1;            param->limitReferences = 0;            param->rc.aqStrength = 0.0;            param->rc.aqMode = X265_AQ_NONE;            param->rc.qgSize = 32;            param->bEnableFastIntra = 1;        }        else if (!strcmp(preset, "superfast"))        {            param->lookaheadDepth = 10;            param->maxCUSize = 32;            param->bframes = 3;            param->bFrameAdaptive = 0;            param->subpelRefine = 1;            param->bEnableEarlySkip = 1;            param->bEnableWeightedPred = 0;            param->rdLevel = 2;            param->maxNumReferences = 1;            param->limitReferences = 0;            param->rc.aqStrength = 0.0;            param->rc.aqMode = X265_AQ_NONE;            param->rc.qgSize = 32;            param->bEnableSAO = 0;            param->bEnableFastIntra = 1;        }        else if (!strcmp(preset, "veryfast"))        {            param->lookaheadDepth = 15;            param->bFrameAdaptive = 0;            param->subpelRefine = 1;            param->bEnableEarlySkip = 1;            param->rdLevel = 2;            param->maxNumReferences = 2;            param->rc.qgSize = 32;            param->bEnableFastIntra = 1;        }        else if (!strcmp(preset, "faster"))        {            param->lookaheadDepth = 15;            param->bFrameAdaptive = 0;            param->bEnableEarlySkip = 1;            param->rdLevel = 2;            param->maxNumReferences = 2;            param->bEnableFastIntra = 1;        }        else if (!strcmp(preset, "fast"))        {            param->lookaheadDepth = 15;            param->bFrameAdaptive = 0;            param->rdLevel = 2;            param->maxNumReferences = 3;            param->bEnableFastIntra = 1;        }        else if (!strcmp(preset, "medium"))        {            /* defaults */        }        else if (!strcmp(preset, "slow"))        {            param->bEnableRectInter = 1;            param->lookaheadDepth = 25;            param->rdLevel = 4;            param->rdoqLevel = 2;            param->psyRdoq = 1.0;            param->subpelRefine = 3;            param->maxNumMergeCand = 3;            param->searchMethod = X265_STAR_SEARCH;            param->maxNumReferences = 4;            param->limitModes = 1;            param->lookaheadSlices = 4; // limit parallelism as already enough work exists        }        else if (!strcmp(preset, "slower"))        {            param->bEnableWeightedBiPred = 1;            param->bEnableAMP = 1;            param->bEnableRectInter = 1;            param->lookaheadDepth = 30;            param->bframes = 8;            param->tuQTMaxInterDepth = 2;            param->tuQTMaxIntraDepth = 2;            param->rdLevel = 6;            param->rdoqLevel = 2;            param->psyRdoq = 1.0;            param->subpelRefine = 3;            param->maxNumMergeCand = 3;            param->searchMethod = X265_STAR_SEARCH;            param->maxNumReferences = 4;            param->limitReferences = 2;            param->limitModes = 1;            param->bIntraInBFrames = 1;            param->lookaheadSlices = 4; // limit parallelism as already enough work exists            param->limitTU = 4;        }        else if (!strcmp(preset, "veryslow"))        {            param->bEnableWeightedBiPred = 1;            param->bEnableAMP = 1;            param->bEnableRectInter = 1;            param->lookaheadDepth = 40;            param->bframes = 8;            param->tuQTMaxInterDepth = 3;            param->tuQTMaxIntraDepth = 3;            param->rdLevel = 6;            param->rdoqLevel = 2;            param->psyRdoq = 1.0;            param->subpelRefine = 4;            param->maxNumMergeCand = 4;            param->searchMethod = X265_STAR_SEARCH;            param->maxNumReferences = 5;            param->limitReferences = 1;            param->limitModes = 1;            param->bIntraInBFrames = 1;            param->lookaheadSlices = 0; // disabled for best quality            param->limitTU = 4;        }        else if (!strcmp(preset, "placebo"))        {            param->bEnableWeightedBiPred = 1;            param->bEnableAMP = 1;            param->bEnableRectInter = 1;            param->lookaheadDepth = 60;            param->searchRange = 92;            param->bframes = 8;            param->tuQTMaxInterDepth = 4;            param->tuQTMaxIntraDepth = 4;            param->rdLevel = 6;            param->rdoqLevel = 2;            param->psyRdoq = 1.0;            param->subpelRefine = 5;            param->maxNumMergeCand = 5;            param->searchMethod = X265_STAR_SEARCH;            param->bEnableTransformSkip = 1;            param->bEnableRecursionSkip = 0;            param->maxNumReferences = 5;            param->limitReferences = 0;            param->bIntraInBFrames = 1;            param->lookaheadSlices = 0; // disabled for best quality            // TODO: optimized esa        }

see: https://bitbucket.org/multicoreware/x265/src/07defe235cde1949c55464952ee1dbdc10baf5e4/source/common/param.cpp?at=default&fileviewer=file-view-default
you are right.
-> Created a new issue inside the x265 bugtracker for this: https://bitbucket.org/multicoreware/x265/issues/398/please-maintain-the-presets-page,
will adjust Hybrid to the source code.

Will go through the source code and adjust Hybrid.
Won't change things like tier&co which are covered by the presets and don't have a default value and are only given a default value by Hybrid.

Cu Selur

(14.04.2018, 00:42)andrewschen Wrote:

(12.04.2018, 20:33)Selur Wrote:

Quote:Apply a preset whose default psyrdoq value is 1

Can you tell me one?
Because looking at: http://x265.readthedocs.io/en/default/presets.html#presets
There isn't a preset which sets '--psy-rdoq'.
So applying any preset will set  '--psy-rdoq' will set 'psy-rdoq' to the default value which is 0.0:

  --[no-]psy-rdoq <0..50.0>     Strength of psycho-visual optimization in RDO quantization, 0 to disable. Default 0.0

-> Still can't reproduce the issue.
But, I stumbled over some code which might cause your issue,..

Cu Selur

Tested the dev version file, x264 rc-lookahead and x265 psy-rdoq was all fixed.

I did read the Preset Option page before I submit this issue, and I thought maybe they just didn't list all the detail parameters in that page? since http://x265.readthedocs.io/en/default/cli.html#cmdoption-psy-rdoq here mentioned psy-rdoq should be 1.0 for presets slow, slower, veryslow. (And maybe placebo also)  

And I tested further in the dev release you sent, by just enabling/disabling 'x265->Misc->Random Stuff->Minimize command line' after applying each preset, some other parameters could still be switched on/off.

(Following order is Enable / Disable 'minimize command line')

ultrafast:
high-tier=1/high-tier=0 (I think this should always be 0 by default, since the default setting in Hybrid GUI is main tier)
deblock=0:0/no-deblock (don't know which is correct, is that deblock should be disabled in preset ultrafast?)
no-opt-qp-pps/opt-qp-pps (I think this should always be disabled by default?)
no-opt-ref-list-length-pps/opt-ref-list-length-pps (I think this should always be disabled by default?)

superfast, veryfast, faster, fast, medium, slow, slower:
high-tier=1/high-tier=0
no-opt-qp-pps/opt-qp-pps
no-opt-ref-list-length-pps/opt-ref-list-length-pps

veryslow:
high-tier=1/high-tier=0
rskip/no-rskip (should be no-rskip for preset veryslow)
no-opt-qp-pps/opt-qp-pps
no-opt-ref-list-length-pps/opt-ref-list-length-pps

placebo:
high-tier=1/high-tier=0
tskip/no-tskip (I guess this should always be no-tskip by default?)
limit-refs=0/limit-refs=3 (should be 0 for placebo)
no-opt-qp-pps/opt-qp-pps
no-opt-ref-list-length-pps/opt-ref-list-length-pps

For you reference. Maybe you can fix them at the same time?