{"record":{"id":"6b800726f1627e20","repo":"Zackriya-Solutions/meetily","slug":"failed-to-open-stdin","errorCode":null,"errorMessage":"Failed to open stdin","messagePattern":"Failed to open stdin","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"info","filePath":"frontend/src-tauri/src/audio/encode.rs","lineNumber":76,"sourceCode":"        ])\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() {\n        error!(\"FFmpeg process failed with status: {}\", status);\n        error!(\"FFmpeg stderr: {}\", stderr);","sourceCodeStart":58,"sourceCodeEnd":94,"githubUrl":"https://github.com/Zackriya-Solutions/meetily/blob/0281737d87d26352fb0adc78c8c0975f691b23d1/frontend/src-tauri/src/audio/encode.rs#L58-L94","documentation":"Child::stdin is Option<ChildStdin>; take() returns None only when the child was spawned without Stdio::piped() stdin. The builder sets .stdin(Stdio::piped()) a few lines above, so this expect is a structural invariant that can only fire if a refactor removes the piped() call while keeping the take().","triggerScenarios":"Refactoring encode_single_audio so .stdin(Stdio::piped()) is dropped or gated behind a flag; moving command construction into a shared helper that forgets to pipe stdin while the caller still takes it.","commonSituations":"Almost never seen in shipped builds; a maintenance hazard when the command builder is generalized for other ffmpeg invocations.","solutions":["Keep the Stdio::piped() call adjacent to spawn() in the same function","Replace expect with an anyhow error ('FFmpeg stdin was not piped') so future refactors fail gracefully","Add a unit test that runs the encoder with a few bytes of silence and asserts success"],"exampleFix":"// before\nlet mut stdin = ffmpeg.stdin.take().expect(\"Failed to open stdin\");\n\n// after\nlet mut stdin = ffmpeg.stdin.take().context(\"FFmpeg stdin was not piped\")?;","handlingStrategy":"validation","validationCode":"// keep the invariant testable\n#[test]\nfn encode_pipes_stdin() {\n    // builds the same command; asserts stdin is piped\n    assert!(command_stdin_is_piped(build_command()));\n}","typeGuard":null,"tryCatchPattern":"let Some(mut stdin) = ffmpeg.stdin.take() else {\n    return Err(anyhow::anyhow!(\"FFmpeg stdin was not piped\"));\n};","preventionTips":["Keep .stdin(Stdio::piped()) on the builder in the same function as spawn()","Replace expects in the encode path with anyhow errors","Cover the encode path with a small end-to-end unit test writing silence"],"tags":["rust","ffmpeg","stdio","child-process","option-expect"],"backgroundTag":"child-stdin-not-piped","analyzedSha":"0281737d87d26352fb0adc78c8c0975f691b23d1","analyzedAt":"2026-08-16T20:57:52.567Z","schemaVersion":2},"datasetVersion":"2026-08-16T23:17:17.608Z"}