tonhowtf/omniget · error

ffmpeg (mix) falhou

Error message

ffmpeg (mix) falhou: {}

What it means

During dubbing, per-language-group audio tracks are mixed with ffmpeg (concat/mix into pcm_s16le WAV). If the ffmpeg process exits with a non-zero status, dub() wraps the trimmed stderr into this error 'ffmpeg (mix) falhou: <stderr>'. It is thrown whenever the external ffmpeg binary cannot complete the mix step.

Solutions

  1. Read the stderr captured in the error message — it names the exact ffmpeg failure (missing input, unknown option, codec issue).
  2. Confirm ffmpeg is installed and recent (ffmpeg -version); install a full build with common codecs (e.g. distro 'ffmpeg' full package) and ensure crate::core::dependencies::ensure_ffmpeg resolved to it.
  3. Check free disk space and that the temp work directory (super::temp_dir()/dub-<uuid>) is writable and was not cleaned mid-run.
  4. Verify each input segment produced by earlier steps is a valid non-empty audio file (ffprobe it) before the mix.
Defensive patterns

Strategy: try-catch

Validate before calling

let ffmpeg = which::which("ffmpeg")?; // or check ensure_ffmpeg()
let status = tokio::process::Command::new(&ffmpeg).arg("-version").output().await?;
if !status.status.success() {
    anyhow::bail!("ffmpeg is present but not executable/functional");
}

Try / catch

match dub(opts).await {
    Err(e) if e.to_string().starts_with("ffmpeg (mix) falhou") => {
        log::error!("mix step failed: {e}"); // stderr is embedded; surface it to the user
    }
    other => other?,
}

Prevention

When it happens

Trigger: Running dub where the ffmpeg mix invocation (args ending in -c:a pcm_s16le) exits non-zero: bad/missing input segments, malformed audio arguments, an ffmpeg build lacking a required encoder/filter, or corrupted intermediate audio files in the temp work dir.

Common situations: System ffmpeg too old or built without needed codecs/filters; disk full preventing the temp WAV from being written; a previous pipeline step produced zero/short audio segments; locale-corrupted filenames with spaces/unicode passed unquoted.

Related errors

AI-assisted analysis of tonhowtf/omniget@8600b91f42 (2026-09-12). Data as JSON: /api/errors/16afe61fc953a335. Report an issue: GitHub.

Appendix: source

Thrown at src-tauri/omniget-core/src/core/tools/dub.rs:173

            labels.push_str(&format!("[a{j}]"));
        }
        filter.push_str(&format!(
            "{}amix=inputs={}:dropout_transition=0:normalize=0[out]",
            labels,
            group.len()
        ));
        cmd.args([
            "-filter_complex",
            &filter,
            "-map",
            "[out]",
            "-c:a",
            "pcm_s16le",
        ])
        .arg(&out);
        let output = cmd.output().await?;
        if !output.status.success() {
            return Err(anyhow!(
                "ffmpeg (mix) falhou: {}",
                String::from_utf8_lossy(&output.stderr).trim()
            ));
        }
        group_files.push(out);
    }
    let dub_audio = out_dir.join(format!("{}.dub.m4a", stem));
    {
        let mut cmd = crate::core::process::command(&ffmpeg);
        cmd.args(["-y", "-hide_banner", "-loglevel", "error"]);
        for g in &group_files {
            cmd.arg("-i").arg(g);
        }
        let mut filter = String::new();
        for j in 0..group_files.len() {
            filter.push_str(&format!("[{j}:a]"));
        }
        filter.push_str(&format!(

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