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# error kind ExecutionFailed
# pre-build errors command failed: exit status: 101
# rustc version rustc 1.96.0-nightly (3b1b0ef4d 2026-03-11)
# docs.rs version docsrs 0.0.0 (a68728e7 2026-03-08 )
# build log [INFO] running `Command { std: "docker" "create" "-v" "/home/cratesfyi/workspace-builder3/builds/ff-encode-0.1.2/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace-builder3/builds/ff-encode-0.1.2/source:/opt/rustwide/workdir:ro,Z" "-v" "/home/cratesfyi/workspace-builder3/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/home/cratesfyi/workspace-builder3/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "DOCS_RS=1" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "6442450944" "--cpus" "6" "--user" "1001:1001" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "rustdoc" "--lib" "-Zrustdoc-map" "--config" "build.rustdocflags=[\"--cfg\", \"docsrs\", \"-Z\", \"unstable-options\", \"--emit=invocation-specific\", \"--resource-suffix\", \"-20260311-1.96.0-nightly-3b1b0ef4d\", \"--static-root-path\", \"/-/rustdoc.static/\", \"--cap-lints\", \"warn\", \"--extern-html-root-takes-precedence\"]" "--offline" "-Zunstable-options" "--config=doc.extern-map.registries.crates-io=\"https://docs.rs/{pkg_name}/{version}/x86_64-unknown-linux-gnu\"" "-Zrustdoc-scrape-examples" "-j6" "--target" "x86_64-unknown-linux-gnu", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 4f13619f865a5a173ff748892fa8610798f01d8310503e8758bc0c49a63c52e2 [INFO] running `Command { std: "docker" "start" "-a" "4f13619f865a5a173ff748892fa8610798f01d8310503e8758bc0c49a63c52e2", kill_on_drop: false }` [INFO] [stderr] warning: Rustdoc did not scrape the following examples because they require dev-dependencies: list_encoders [INFO] [stderr] If you want Rustdoc to scrape these examples, then add `doc-scrape-examples = true` [INFO] [stderr] to the [[example]] target configuration of at least one example. [INFO] [stderr] warning: target filter specified, but no targets matched; this is a no-op [INFO] [stderr] Compiling ff-sys v0.1.2 [INFO] [stderr] warning: ff-sys@0.1.2: pkg-config: libavformat not found: [INFO] [stderr] error: failed to run custom build command for `ff-sys v0.1.2` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `/opt/rustwide/target/debug/build/ff-sys-44941e8231ccfdc6/build-script-build` (exit status: 101) [INFO] [stderr] --- stdout [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_PATH [INFO] [stderr] cargo:rerun-if-env-changed=LIBAVFORMAT_NO_PKG_CONFIG [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_x86_64-unknown-linux-gnu [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_x86_64_unknown_linux_gnu [INFO] [stderr] cargo:rerun-if-env-changed=HOST_PKG_CONFIG [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG [INFO] [stderr] cargo:rerun-if-env-changed=LIBAVFORMAT_STATIC [INFO] [stderr] cargo:rerun-if-env-changed=LIBAVFORMAT_DYNAMIC [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_ALL_STATIC [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_ALL_DYNAMIC [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64-unknown-linux-gnu [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64_unknown_linux_gnu [INFO] [stderr] cargo:rerun-if-env-changed=HOST_PKG_CONFIG_PATH [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_PATH [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64-unknown-linux-gnu [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64_unknown_linux_gnu [INFO] [stderr] cargo:rerun-if-env-changed=HOST_PKG_CONFIG_LIBDIR [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64-unknown-linux-gnu [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64_unknown_linux_gnu [INFO] [stderr] cargo:rerun-if-env-changed=HOST_PKG_CONFIG_SYSROOT_DIR [INFO] [stderr] cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR [INFO] [stderr] cargo:warning=pkg-config: libavformat not found: [INFO] [stderr] pkg-config exited with status code 1 [INFO] [stderr] > PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1 pkg-config --libs --cflags libavformat 'libavformat >= 61.0' [INFO] [stderr] [INFO] [stderr] The system library `libavformat` required by crate `ff-sys` was not found. [INFO] [stderr] The file `libavformat.pc` needs to be installed and the PKG_CONFIG_PATH environment variable must contain its parent directory. [INFO] [stderr] The PKG_CONFIG_PATH environment variable is not set. [INFO] [stderr] [INFO] [stderr] HINT: if you have installed the library, try setting PKG_CONFIG_PATH to the directory containing `libavformat.pc`. [INFO] [stderr] [INFO] [stderr] [INFO] [stderr] --- stderr [INFO] [stderr] [INFO] [stderr] thread 'main' (15) panicked at /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/ff-sys-0.1.2/build.rs:265:5: [INFO] [stderr] FFmpeg not found on Linux. [INFO] [stderr] Please install FFmpeg development packages: [INFO] [stderr] [INFO] [stderr] Ubuntu/Debian: [INFO] [stderr] sudo apt install libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libswresample-dev [INFO] [stderr] [INFO] [stderr] Fedora: [INFO] [stderr] sudo dnf install ffmpeg-devel [INFO] [stderr] [INFO] [stderr] Arch Linux: [INFO] [stderr] sudo pacman -S ffmpeg [INFO] [stderr] [INFO] [stderr] If FFmpeg is installed in a non-standard location, set PKG_CONFIG_PATH: [INFO] [stderr] export PKG_CONFIG_PATH="/path/to/ffmpeg/lib/pkgconfig" [INFO] [stderr] note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace [INFO] running `Command { std: "docker" "inspect" "4f13619f865a5a173ff748892fa8610798f01d8310503e8758bc0c49a63c52e2", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "4f13619f865a5a173ff748892fa8610798f01d8310503e8758bc0c49a63c52e2", kill_on_drop: false }` [INFO] [stdout] 4f13619f865a5a173ff748892fa8610798f01d8310503e8758bc0c49a63c52e2