Problems with transcoding to H.265 with FFmpeg

[PescaGialla]

Hi everyone, i'm trying to transcode my JPEG2000 mvk file to h.265 with ffmpeg but it gives me some errors and i have no idea on how to get it to start encoding the video. Dont know if it's relevant but i'm encoding the video with myFFmpeg gui.
Here's the FFMpeg error log:

"C:\Users\Admin\AppData\Roaming\myFFmpeg\ffmpeg.ex e" -probesize 50M -analyzeduration 100M -i "E:\APOCAL~1.MKV" -pass 3 -passlogfile "D:\qui\myffmpeg_41706F63616C797073652E4E6F772E313 937392E324B2E4443502E52454D55582E4A50324B2E464C414 32E352E6D6B76" -an -map 0:0 -map 0:1 -c:v libx265 -b:v 0k -maxrate 0k -bufsize 0k -r 1 -s xYZ12LE(PROGRESSIVE) -aspect 1024:429 -pix_fmt yuv420p -x265-params me=hex:qcomp=0.5cenecut=40:bframes=4:rc-lookahead=40:min-keyint=1:keyint=2 -color_primaries bt2020 -color_trc bt2020_10bit -colorspace bt2020_cl -sws_flags fast_bilinear -qmin 3 -qmax 51 -sn -f rawvideo -y nul

ffmpeg version N-90173-gfa0c9d69d3 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 7.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-amf --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
libavutil 56. 7.101 / 56. 7.101
libavcodec 58. 13.100 / 58. 13.100
libavformat 58. 10.100 / 58. 10.100
libavdevice 58. 2.100 / 58. 2.100
libavfilter 7. 12.100 / 7. 12.100
libswscale 5. 0.101 / 5. 0.101
libswresample 3. 0.101 / 3. 0.101
libpostproc 55. 0.100 / 55. 0.100

[LigH.de]

What the HECK produced this nonsensical command line?

-b:v 0k -maxrate 0k -bufsize 0k

Zero bitrate, zero VBV decoding buffer size. So you want an empty file? I can not even recognize an output file name (if it is "nul", it may indeed produce no file at all).

By the way, your output does not even contain any error message.

[blud7]

Also there's this:

"C:\Users\Admin\AppData\Roaming\myFFmpeg\ffmpe g.ex e"

[LigH.de]

Yes, that is the actually active ffmpeg application, which the myFFmpeg GUI hides from the user, because most users in these days can't handle command line applications.

I still can't imagine why the GUI would call ffmpeg with such parameters, could it be that you never set up any target bitrate (or quality level, what I would recommend instead)?