[HELP] how to encode AVS2 to H265 video?

[Selur]

Can't see a crash in the debug output,..
it starts with:

ffmpeg version N-121490-g7e8ef2ded2 Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 15.2.0 (Rev8, Built by MSYS2 project)
  configuration:  --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache g++' --ld='ccache g++' --extra-cxxflags=-fpermissive --extra-cflags=-Wno-int-conversion --disable-autodetect --enable-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libdav1d --enable-libaom --disable-debug --enable-fontconfig --enable-libass --enable-libbluray --enable-libfreetype --enable-libharfbuzz --enable-libmfx --enable-libmysofa --enable-libopenjpeg --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libopenmpt --enable-librav1e --enable-libsrt --enable-libgsm --enable-libvmaf --enable-libsvtav1 --enable-libglslang --enable-vulkan --enable-libdavs2 --enable-libuavs3d --enable-liboapv --extra-cflags=-DLIBTWOLAME_STATIC --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads
  libavutil      60. 13.100 / 60. 13.100
  libavcodec     62. 16.100 / 62. 16.100
  libavformat    62.  6.101 / 62.  6.101
  libavdevice    62.  2.100 / 62.  2.100
  libavfilter    11.  9.100 / 11.  9.100
  libswscale      9.  3.100 /  9.  3.100
  libswresample   6.  2.100 /  6.  2.100
[davs2 info]: davs2: 1.6.206 b41cf117452e2d73.8, 2025-10-24 14:43:32
[davs2 info]: CPU Capabilities:  MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2

[davs2 info]: Manager 23e895d5fe0: using 1 thread(s): 1(frame/AEC)+0(pool/REC), 2 tasks

[davs2 info]: Manager 23e895d5fe0: Sequence Resolution: 3840x2160.

[davs2 error]: Dec[ 0] 23e895d6b60: Un-supported bit-depth 10 in this version.


[davs2 error]: Dec[ 0] 23e895d6b60: Un-supported bit-depth 10 in this version.


Input #0, mpegts, from 'F:\avs2\AVS2.ts':
  Duration: 01:18:47.99, start: 1.400000, bitrate: 26218 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
  Stream #0:0[0x100]: Video: avs2 (libdavs2) (AVSV / 0x56535641), yuv420p10le, 3840x2160, 50 fps, 50 tbr, 90k tbn, start 2.052533

  Stream #0:1[0x101]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 384 kb/s, start 1.400000
Stream mapping:
  Stream #0:1 -> #0:0 (copy)

Output #0, ac3, to 'C:\Users\x\AppData\Local\Temp\iId_1_aid_257_2025-10-25@19_33_46_1410_01.ac3':
  Metadata:
    encoding_tool   : Hybrid 2025.10.24.1
    encoder         : Lavf62.6.101
  Stream #0:0: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 384 kb/s
Press [q] to stop, [?] for help

after that is does not seem to crash, but just output empty data,...
seems like ffmpeg doesn't support 10bit avs2 ¯\_(ツ)_/¯

There seem to be custom builds of ffmpeg which support this, see: https://github.com/xatabhk/FFmpeg-avs2-avs3/releases
but those are not part of libdavs2 atm.
Nothing I can do about that, but you can probably simply replace the existing ffmpeg version with one from that github repository. (I did not test this, this is just an assumption,... and I don't know whether this will break decoding of something else through ffmpeg.)

Cu Selur