[BUG] x265 1st pass encoding never starts

[Selur]

Vapoursynth isn't needed,...

What happened according to the debug output.

• 2021-05-27@19_47_04_6310_01_attach was run to extract the existing attachments
  
  "/Applications/_Mes_Applis_/Video/Conversion/Hybrid.app/Contents/MacOS/Mkvtoolnix.app/Contents/MacOS/mkvextract" attachments "/Volumes/Racines/Akira.mkv" 1:"/Users/Laurent/Movies/Hybrid/2021-05-27@19_47_04_6310_cover_land.jpg" 2:"/Users/Laurent/Movies/Hybrid/2021-05-27@19_47_04_6310_small_cover.jpg" 3:"/Users/Laurent/Movies/Hybrid/2021-05-27@19_47_04_6310_small_cover_land.jpg" 4:"/Users/Laurent/Movies/Hybrid/2021-05-27@19_47_04_6310_cover.jpg"
• 2021-05-27@19_47_04_6310_02_create run to create a qp file ("/Users/Laurent/Movies/Hybrid/Akira_2160p_2021-05-27@19_47_04_6310_02.qp")
  
• 2021-05-27@19_47_04_6310_03_video was started to encode the video
  
  "/Applications/_Mes_Applis_/Video/Conversion/Hybrid.app/Contents/MacOS/ffmpeg" -y -loglevel fatal -noautorotate -nostdin -threads 4 -i "/Volumes/Racines/Akira.mkv" -map 0:0 -an -sn -vf pad=3840:2160:0:42,zscale=rangein=tv:range=tv -pix_fmt yuv420p10le -strict -1 -vsync 0 -f yuv4mpegpipe - | "/Applications/_Mes_Applis_/Video/Conversion/Hybrid.app/Contents/MacOS/x265" --input - --output-depth 10 --y4m --uhd-bd --profile main10 --level-idc 5.1 --limit-modes --no-early-skip --no-open-gop --opt-ref-list-length-pps --keyint 24 --min-keyint 1 --bframes 6 --lookahead-slices 0 --crf 14.00 --opt-qp-pps --cbqpoffs -2 --crqpoffs -2 --qpfile "/Users/Laurent/Movies/Hybrid/Akira_2160p_2021-05-27@19_47_04_6310_02.qp" --limit-refs 0 --ssim-rd --psy-rd 2.50 --rdoq-level 2 --psy-rdoq 10.00 --aq-mode 0 --vbv-maxrate 160000 --vbv-bufsize 160000 --hrd --vui-hrd-info --aud --deblock=-1:-1 --range limited --colorprim bt2020 --transfer bt709 --colormatrix bt2020c --chromaloc 1 --master-display "G(8500,39850)B(6550,2300)R(35400,14600)WP(15635,16450)L(10000000,50)" --max-cll 1000,369 --hdr --hdr-opt --output "/Users/Laurent/Movies/Hybrid/2021-05-27@19_47_04_6310_03.265"
  after 7 minutes the creation of the debug output was disabled,...
  

Since the debug output doesn't hold any info the only thing I would say to test what happens if you call the encoding call in a terminal,..

Cu Selur