x264 rc-lookahead

[Selur]

Note that: rc-lookahead is a encoding side parameter, so it has no influence in regard to compatibility
That said, I'll try to look into it after work and report back.
--
I checked the used encoding calls:
1st pass encoding call:

"/usr/local/bin/vspipe" "/private/var/folders/yy/31psqpj105z4fb4kkt989rr80000gn/T/encodingTempSynthSkript_2023-02-07@13_54_15_8510.vpy" - -c y4m | "/Applications/Hybrid.app/Contents/MacOS/x264" --pass 1 --bitrate 2000 --profile high --level 4.1 --ref 1 --keyint 250 --min-keyint 0 --scenecut 40 --bframes 16 --b-bias 0 --b-pyramid normal --direct auto --b-adapt 2 --sync-lookahead 12 --cplxblur 20.0 --qcomp 0.60 --qblur 0.50 --no-mbtree --rc-lookahead 60 --ipratio 1.40 --pbratio 1.30 --chroma-qp-offset 0 --qpmin 0 --qpmax 69 --qpstep 4 --partitions none --no-8x8dct --8x8dct --me dia --mvrange -1 --subme 2 --cabac --trellis 0 --weightp 2 --aq-mode 1 --aq-strength 1.00 --nr 0 --deadzone-inter 21 --deadzone-intra 11 --cqm flat --threads auto --sar 8:9 --qpfile "/private/var/folders/yy/31psqpj105z4fb4kkt989rr80000gn/T/Test_2023-02-07@13_54_15_8510_08.qp" --deblock -2:-2 --non-deterministic --range tv --stats "/private/var/folders/yy/31psqpj105z4fb4kkt989rr80000gn/T/Test_2023-02-07@13_54_15_8510_09.stats" --demuxer y4m --input-range tv --fps 60000/1001 --output-csp i420 --output-depth 8 --output /dev/null -

2nd pass encoding call:

"/usr/local/bin/vspipe" "/private/var/folders/yy/31psqpj105z4fb4kkt989rr80000gn/T/encodingTempSynthSkript_2023-02-07@13_54_15_8510.vpy" - -c y4m | "/Applications/Hybrid.app/Contents/MacOS/x264" --pass 2 --bitrate 2000 --profile high --level 4.1 --ref 8 --keyint 250 --min-keyint 0 --scenecut 40 --bframes 16 --b-bias 0 --b-pyramid normal --direct auto --b-adapt 2 --sync-lookahead 12 --cplxblur 20.0 --qcomp 0.60 --qblur 0.50 --no-mbtree --rc-lookahead 60 --ipratio 1.40 --pbratio 1.30 --chroma-qp-offset 0 --qpmin 0 --qpmax 69 --qpstep 4 --partitions all --8x8dct --me umh --merange 16 --mvrange -1 --subme 10 --cabac --trellis 2 --psy-rd 1.00:0.00 --weightp 2 --aq-mode 1 --aq-strength 1.00 --vbv-maxrate 62500 --vbv-bufsize 78125 --nr 0 --deadzone-inter 21 --deadzone-intra 11 --cqm flat --threads auto --sar 8:9 --qpfile "/private/var/folders/yy/31psqpj105z4fb4kkt989rr80000gn/T/Test_2023-02-07@13_54_15_8510_08.qp" --deblock -2:-2 --non-deterministic --range tv --colormatrix bt709 --stats "/private/var/folders/yy/31psqpj105z4fb4kkt989rr80000gn/T/Test_2023-02-07@13_54_15_8510_09.stats" --demuxer y4m --input-range tv --fps 60000/1001 --output-csp i420 --output-depth 8 --output "/private/var/folders/yy/31psqpj105z4fb4kkt989rr80000gn/T/2023-02-07@13_54_15_8510_10.264" -

Those look fine to me. I don't see any issue in the calls.

=> got it, you disabled mb-tree, without mb-tree rc-lookahead isn't used in the encoding and thus x264 reports it as 0.
So if you want it, you need to enable: 'x264->Rate Control->Rate Control Settings->Macroblock tree rate control'.

Cu Selur