{"record":{"id":"820de29c3d2c7bae","repo":"Zackriya-Solutions/meetily","slug":"failed-to-spawn-ffmpeg-process-820de2","errorCode":null,"errorMessage":"Failed to spawn FFmpeg process","messagePattern":"Failed to spawn FFmpeg process","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"critical","filePath":"frontend/src-tauri/src/audio/encode.rs","lineNumber":74,"sourceCode":"            \"mp4\",\n            output_path.to_str().unwrap(),\n        ])\n        .stdin(Stdio::piped())\n        .stdout(Stdio::piped())\n        .stderr(Stdio::piped());\n\n    // Hide console window on Windows to prevent CMD popup during recording\n    #[cfg(target_os = \"windows\")]\n    {\n        use std::os::windows::process::CommandExt;\n        const CREATE_NO_WINDOW: u32 = 0x08000000;\n        command.creation_flags(CREATE_NO_WINDOW);\n    }\n\n    debug!(\"FFmpeg command: {:?}\", command);\n\n    #[allow(clippy::zombie_processes)]\n    let mut ffmpeg = command.spawn().expect(\"Failed to spawn FFmpeg process\");\n    debug!(\"FFmpeg process spawned\");\n    let mut stdin = ffmpeg.stdin.take().expect(\"Failed to open stdin\");\n\n    stdin.write_all(data)?;\n\n    debug!(\"Dropping stdin\");\n    drop(stdin);\n    debug!(\"Waiting for FFmpeg process to exit\");\n    let output = ffmpeg.wait_with_output().unwrap();\n    let status = output.status;\n    let stdout = String::from_utf8_lossy(&output.stdout);\n    let stderr = String::from_utf8_lossy(&output.stderr);\n\n    debug!(\"FFmpeg process exited with status: {}\", status);\n    debug!(\"FFmpeg stdout: {}\", stdout);\n    debug!(\"FFmpeg stderr: {}\", stderr);\n\n    if !status.success() {","sourceCodeStart":56,"sourceCodeEnd":92,"githubUrl":"https://github.com/Zackriya-Solutions/meetily/blob/0281737d87d26352fb0adc78c8c0975f691b23d1/frontend/src-tauri/src/audio/encode.rs#L56-L92","documentation":"std::process::Command::spawn returns Err when the program cannot be started. The code resolved an FFmpeg path via find_ffmpeg_path() and immediately .expect()s, so any spawn failure panics the encoding path: binary missing at the resolved path (deleted/moved after discovery), exec permission denied, OS refusing exec (macOS Gatekeeper quarantine, antivirus/SELinux/AppLocker), or fork/exec resource exhaustion.","triggerScenarios":"find_ffmpeg_path returns a stale or decoy PATH entry that no longer executes; an unsigned bundled ffmpeg blocked by com.apple.quarantine on macOS; Windows Defender or enterprise whitelisting blocking ffmpeg.exe; memory pressure making fork fail mid-recording.","commonSituations":"Users without a working FFmpeg install, portable app moved after path resolution, first launch of downloaded builds carrying quarantine attributes, locked-down corporate machines.","solutions":["Replace .expect with ? and an anyhow context (\"Failed to start FFmpeg at {path}\") so the recording save path returns a user-visible error","Smoke-test the binary before spawning: run Command::new(&ffmpeg_path).arg(\"-version\") and treat failure as 'FFmpeg unavailable'","On macOS, strip com.apple.quarantine from bundled ffmpeg (xattr -d) or code-sign it","Re-install FFmpeg (brew install ffmpeg / winget install Gyan.FFmpeg) and confirm `ffmpeg -version` in a shell"],"exampleFix":"// before\nlet mut ffmpeg = command.spawn().expect(\"Failed to spawn FFmpeg process\");\n\n// after\nlet mut ffmpeg = command.spawn().with_context(|| {\n    format!(\"Failed to start FFmpeg at {:?}\", ffmpeg_path)\n})?;","handlingStrategy":"validation","validationCode":"use std::os::unix::fs::PermissionsExt;\nfn ffmpeg_ok(p: &std::path::Path) -> bool {\n    p.is_file()\n        && (cfg!(not(unix)) || std::fs::metadata(p)\n            .map(|m| m.permissions().mode() & 0o111 != 0)\n            .unwrap_or(false))\n}\n\nif !ffmpeg_ok(&ffmpeg_path) {\n    return Err(anyhow::anyhow!(\"FFmpeg at {:?} is not executable\", ffmpeg_path));\n}","typeGuard":null,"tryCatchPattern":"match command.spawn() {\n    Ok(child) => child,\n    Err(e) => {\n        log::error!(\"failed to start FFmpeg: {e}\");\n        return Err(anyhow::anyhow!(\"FFmpeg start failed: {e}\").into());\n    }\n}","preventionTips":["Check `ffmpeg -version` from a shell before relying on bundled discovery","Remove quarantine attributes from downloaded binaries (xattr -d com.apple.quarantine) or code-sign them","Never .expect() on spawn(); propagate the io::Error with the resolved path in the context"],"tags":["rust","ffmpeg","process-spawn","audio-encoding","desktop-app"],"backgroundTag":"process-spawn-failed","analyzedSha":"0281737d87d26352fb0adc78c8c0975f691b23d1","analyzedAt":"2026-08-16T20:57:52.567Z","schemaVersion":2},"datasetVersion":"2026-08-16T23:17:17.608Z"}