tonhowtf/omniget · error · anyhow::Error

Failed to convert thumbnail to JPEG

Error message

Failed to convert thumbnail to JPEG

What it means

If the downloaded thumbnail is WebP/AVIF or another format ffmpeg cannot transcode to JPEG for mp4 cover art, the spawned ffmpeg conversion exits non-zero and the temp jpg is removed, then this generic error is thrown. The message carries no ffmpeg stderr, so the root cause must be found elsewhere.

Solutions

1. Verify ffmpeg is installed and on PATH (ffmpeg -version).
2. Capture and log ffmpeg stderr in convert_result to see the real decode error.
3. Log the actual content-type/extension; some hosts send image/webp with an .jpg URL — detect via magic bytes instead of content-type.
4. Fall back to embedding the original thumbnail file if ffmpeg conversion fails.

Example fix

// before
let _ = std::fs::remove_file(&jpg_path);
return Err(anyhow!("Failed to convert thumbnail to JPEG"));
// after
let _ = std::fs::remove_file(&jpg_path);
let stderr = String::from_utf8_lossy(&convert_output.stderr).to_string();
anyhow::bail!("Failed to convert thumbnail to JPEG: {stderr}");

// Verify ffmpeg exists before spawning
if which::which("ffmpeg").is_err() {
    log::warn!("ffmpeg not found; skipping jpeg conversion");
    return Ok(thumb_path);
}

match convert_result {
    Ok(status) if status.success() => return Ok(jpg_path),
    Ok(status) => log::warn!("ffmpeg exited {status} converting thumbnail"),
    Err(e) => log::warn!("ffmpeg spawn failed: {e}"),
}
Ok(thumb_path) // fall back to original thumbnail

When it happens

Trigger: ffmpeg binary fails or is missing; the image format isn't decodable (e.g., AVIF); the source thumbnail file was removed before conversion; ffmpeg argument issue.

Common situations: ffmpeg not installed or not on PATH; YouTube/CDN now serving WebP thumbnails with a JPEG content-type fallback missing; corrupt or truncated image bytes.

Related errors

• ffmpeg
• ffmpeg nao converteu a imagem
• {}
• FFmpeg not found in Flatpak sandbox
• Downloaded file from

AI-assisted analysis of tonhowtf/omniget@8600b91f42 (2026-09-12). Data as JSON: /api/errors/afd2887ef3498ccc. Report an issue: GitHub.

Appendix: source

Thrown at src-tauri/omniget-core/src/core/ffmpeg.rs:624

                "-y",
                "-i",
                &thumb_path.to_string_lossy(),
                &jpg_path.to_string_lossy(),
            ])
            .stdout(std::process::Stdio::null())
            .stderr(std::process::Stdio::null())
            .status()
            .await;

        let _ = std::fs::remove_file(&thumb_path);

        if let Ok(status) = convert_result {
            if status.success() {
                return Ok(jpg_path);
            }
        }
        let _ = std::fs::remove_file(&jpg_path);
        return Err(anyhow!("Failed to convert thumbnail to JPEG"));
    }

    Ok(thumb_path)
}

fn parse_out_time_us(line: &str) -> Option<u64> {
    let line = line.trim();
    if let Some(val) = line.strip_prefix("out_time_us=") {
        return val.trim().parse::<u64>().ok();
    }
    if let Some(val) = line.strip_prefix("out_time_ms=") {
        return val.trim().parse::<u64>().ok().map(|ms| ms * 1000);
    }
    None
}

View on GitHub (pinned to 8600b91f42)