ffmpeg libx265 2pass encoding do not work properly

[ZMachine]

hello,

basically using the following command line even if ffmpeg correctly complete encoding, log file created from the 1st pass is emply and cannot be used by the 2nd pass

"H:\Project\bin\Release\data\bin64\ffmpeg.exe" -hwaccel auto -i "H:\videotest\test.mkv" -map 0:v:0 -c:v libx265 -pass 1 -passlogfile "H:\videotest\outputaxsxafccs.stats" -b:v 5000k -preset 5 -x265-params level=0:profile=undefined:pmode:no-pme:pme:no-high-tier:ref=3:bframes=4:open-gop:keyint=250:min-keyint=25:b-adapt=2:bframe-bias=0:rc-lookahead=20:no-scenecut:b-pyramid:me=hex:subme=2:merange=57:temporal-mvp:weightp:no-weightb:max-merge=2:no-weightb:no-rect:no-amp:vbv-bufsize=0:vbv-maxrate=0:vbv-init=0.9:no-slow-firstpass:no-strict-cbr:qcomp=0.6:qstep=4:aq-mode=1:aq-strength=1.0:cutree:no-early-skip:ctu=64:no-fast-cfb:ipratio=1.4:pbratio=1.3:cbqpoffs=0:crqpoffs=0:rd=3:psy-rd=0.3:psy-rdoq=1:b-intra:no-fast-intra:rdoq-level=1:no-tskip:no-tskip-fast:cu-lossless:tu-intra-depth=1:tu-inter-depth=1:strong-intra-smoothing:no-constrained-intra:nr-intra=0:nr-inter=0:qblur=0.5:cplxblur=20:signhide:sar=16 -f null -

2nd pass

"H:\Project\bin\Release\data\bin64\ffmpeg.exe" -hwaccel auto -i "H:\videotest\test.mkv" -map 0:v:0 -c:v libx265 -pass 2 -passlogfile "H:\videotest\outputaxsxafccs.stats" -b:v 5000k -preset 5 -x265-params level=0:profile=undefined:pmode:no-pme:pme:no-high-tier:ref=3:bframes=4:open-gop:keyint=250:min-keyint=25:b-adapt=2:bframe-bias=0:rc-lookahead=20:no-scenecut:b-pyramid:me=hex:subme=2:merange=57:temporal-mvp:weightp:no-weightb:max-merge=2:no-weightb:no-rect:no-amp:vbv-bufsize=0:vbv-maxrate=0:vbv-init=0.9:no-slow-firstpass:no-strict-cbr:qcomp=0.6:qstep=4:aq-mode=1:aq-strength=1.0:cutree:no-early-skip:ctu=64:no-fast-cfb:ipratio=1.4:pbratio=1.3:cbqpoffs=0:crqpoffs=0:rd=3:psy-rd=0.3:psy-rdoq=1:b-intra:no-fast-intra:rdoq-level=1:no-tskip:no-tskip-fast:cu-lossless:tu-intra-depth=1:tu-inter-depth=1:strong-intra-smoothing:no-constrained-intra:nr-intra=0:nr-inter=0:qblur=0.5:cplxblur=20:signhide:sar=16 -map 0:a:0 -c:a copy -map 0:a:1 -c:a copy -map 0:s:0 -c:s copy -map 0:s:1 -c:s copy "H:\videotest\outputaxsxafccs.mkv"

there is an error in the command line string or it's a bug?

[Carl Eugen Hoyos]

Please test current FFmpeg git head with a simplified command line and provide the complete, uncut console output to make this a valid ticket.