this derivation will be built:
  /nix/store/377hh34zsx3qgfj0azbvpjj5frbd87rw-mpv-convert-script-2016-03-18.drv
these 7 paths will be fetched (4.8 MiB download, 28.1 MiB unpacked):
  /nix/store/df5wzcvmwlnmcc0pw9z9h2sgq9ij5dvq-fmt-7.1.3
  /nix/store/6ghnsh9ha5jxbw6a2b611k6jjk1zm7wg-fmt-7.1.3-dev
  /nix/store/i7cdswgfvrdbqw96cmk28m7jccgbr9s5-libebml-1.4.4
  /nix/store/wjg5d1q9xyjd6isx7h56nx69jzkwk650-libmatroska-1.7.1
  /nix/store/n3mhhlk3l1qasw4nsbr29mj78bwnfmhr-mkvtoolnix-73.0.0
  /nix/store/v2v4lblycv6cmfdybyazp63ggvzhxrkn-nlohmann_json-3.11.2
  /nix/store/4m285fmh21lpvds7mlq6kd02w3y6dhg8-yad-12.1
building '/nix/store/377hh34zsx3qgfj0azbvpjj5frbd87rw-mpv-convert-script-2016-03-18.drv'
mpv-convert-script-2016-03-18> unpacking sources
mpv-convert-script-2016-03-18> unpacking source archive /nix/store/72yxqg6kjs4jmnpvm3vlvk2b9phfcmzy-25ea7ae77b30af959be0-f95cee4
mpv-convert-script-2016-03-18> source root is 25ea7ae77b30af959be0-f95cee4
mpv-convert-script-2016-03-18> patching sources
mpv-convert-script-2016-03-18> applying patch /nix/store/2018n8y8gz05j6zva445xdssq7ck7g64-convert.patch
mpv-convert-script-2016-03-18> patching file 'Convert Script – README.md'
mpv-convert-script-2016-03-18> patching file convert_script.lua
mpv-convert-script-2016-03-18> configuring
mpv-convert-script-2016-03-18> no configure script, doing nothing
mpv-convert-script-2016-03-18> installing
mpv-convert-script-2016-03-18> post-installation fixup
mpv-convert-script-2016-03-18> shrinking RPATHs of ELF executables and libraries in /nix/store/4jfm1mq68ynm80df7pylhca80hgv6szk-mpv-convert-script-2016-03-18
mpv-convert-script-2016-03-18> patching script interpreter paths in /nix/store/4jfm1mq68ynm80df7pylhca80hgv6szk-mpv-convert-script-2016-03-18
mpv-convert-script-2016-03-18> checking for references to /build/ in /nix/store/4jfm1mq68ynm80df7pylhca80hgv6szk-mpv-convert-script-2016-03-18...
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy

upload niks3: ok