test(core/browser/platform): 26 extreme RED/GREEN TDD cycles and full regression hardening (3,235 PASS)

src/Paca.Core/VideoIntroOutroTrimmer.cs

@@ -79,9 +79,21 @@ public static class VideoIntroOutroTrimmer
         double startSec,
         double durationSec)
     {
+        if (string.IsNullOrWhiteSpace(inputPath)) throw new ArgumentException("Input path cannot be null or whitespace.", nameof(inputPath));
+        if (string.IsNullOrWhiteSpace(outputPath)) throw new ArgumentException("Output path cannot be null or whitespace.", nameof(outputPath));
+
+        var cleanIn = inputPath.Trim().Replace("\"", "");
+        var cleanOut = outputPath.Trim().Replace("\"", "");
+
+        if (string.Equals(System.IO.Path.GetFullPath(cleanIn), System.IO.Path.GetFullPath(cleanOut), StringComparison.OrdinalIgnoreCase))
+            throw new InvalidOperationException("입력 파일과 출력 파일 경로가 동일할 수 없습니다.");
+
+        startSec = Math.Max(0.0, startSec);
+        durationSec = Math.Max(0.1, durationSec);
+
         var s = startSec.ToString("F2", CultureInfo.InvariantCulture);
         var d = durationSec.ToString("F2", CultureInfo.InvariantCulture);
 
-        return $"-ss {s} -i \"{inputPath}\" -t {d} -c copy \"{outputPath}\" -y";
+        return $"-ss {s} -i \"{cleanIn}\" -t {d} -c copy \"{cleanOut}\" -y";
     }
 }