Feat/auto subtitle generation

src/components/ExportSettings.tsx

@@ -196,10 +196,19 @@ export default function ExportSettings({
             <span
               className="cursor-help"
               title="Reduces video noise. May slow down export slightly."
+            htmlFor="noise-reduction-toggle"
+            className="text-sm font-heading font-semibold uppercase tracking-wider text-[var(--muted)] flex items-center gap-2"
+          >
+            <SlidersHorizontal size={10} />
+            Noise Reduction
+            <span
+              className="cursor-help"
+              title="Reduces grain in low-light videos using FFmpeg hqdn3d filter."
             >
               <InfoIcon size={14} />
             </span>
           </label>
+<<<<<<< HEAD
 
           <span className="flex text-sm font-heading font-bold text-film-600">
             <input
@@ -234,6 +243,38 @@ export default function ExportSettings({
             May slightly increase export time.
           </span>
         </div>
+=======
+        </div>
+
+        <p className="text-xs text-[var(--muted)] mb-2">
+          Reduce grain in low-light footage
+        </p>
+
+        <div className="flex gap-2">
+          {(['off', 'light', 'medium', 'heavy'] as const).map((level) => (
+            <button
+              key={level}
+              onClick={() => onChange({ noiseReduction: level })}
+              className={cn(
+                "flex-1 py-1 text-xs font-heading font-semibold uppercase rounded border transition-colors",
+                recipe.noiseReduction === level
+                  ? "bg-film-600 text-white border-film-600"
+                  : "text-[var(--muted)] border-[var(--muted)] hover:border-film-600 hover:text-film-600"
+              )}
+            >
+              {level}
+            </button>
+          ))}
+        </div>
+
+        {recipe.noiseReduction !== 'off' && (
+          <div className="flex justify-end mt-2">
+            <span className="text-xs text-red-700 font-medium">
+              ⚠ Note: significantly increases processing time.
+            </span>
+          </div>
+        )}
+>>>>>>> 92b9083 (feat: add noise reduction filter with Light/Medium/Heavy presets (closes #129))
       </div>
     </>
   );

src/lib/constants.ts

@@ -22,6 +22,5 @@ export const DEFAULT_RECIPE: EditRecipe = {
   denoise: false,
   soundOnCompletion: false,
   normalizeAudio: false,
-  textOverlays: [],
-  version: RECIPE_VERSION,
+  noiseReduction: 'off',
 };

src/lib/ffmpeg.ts

@@ -336,7 +336,15 @@ export function buildVideoFilter(recipe: EditRecipe, targetW: number, targetH: n
   if (recipe.stabilization) {
     filters.push("deshake");
   }
-
+// Noise reduction using hqdn3d filter
+  if (recipe.noiseReduction && recipe.noiseReduction !== 'off') {
+    const noiseMap = {
+      light:  'hqdn3d=2.0:1.5:3.0:2.5',
+      medium: 'hqdn3d=4.0:3.0:6.0:4.5',
+      heavy:  'hqdn3d=6.0:5.0:9.0:6.5',
+    }
+    filters.push(noiseMap[recipe.noiseReduction])
+  }
   if (recipe.rotate === 90) {
     filters.push("transpose=1");
   } else if (recipe.rotate === 180) {
@@ -392,8 +400,7 @@ export function buildVideoFilter(recipe: EditRecipe, targetW: number, targetH: n
   return filters.join(",");
 }
 
-export function buildAudioFilter(speed: number, normalizeAudio: boolean): string {
-  if (speed <= 0) return "";
+ export function buildAudioFilter(speed: number, normalizeAudio: boolean = false): string {
   const filters: string[] = [];
 
   let remaining = speed;

src/lib/tests/ffmpeg.test.ts

@@ -5,36 +5,30 @@ describe("buildAudioFilter", () => {
   it("should return an empty string for 1.0x speed", () => {
     expect(buildAudioFilter(1, false)).toBe("");
   });
-
   it("should chain two 0.5x filters for 0.25x speed", () => {
     expect(buildAudioFilter(0.25, false)).toBe("atempo=0.5,atempo=0.5");
   });
-
   it("should chain two 2.0x filters for 4.0x speed", () => {
     expect(buildAudioFilter(4, false)).toBe("atempo=2.0,atempo=2");
   });
-
   it("should chain multiple 0.5x filters and a remainder for 0.1x speed", () => {
-    // 0.1 / 0.5 = 0.2
-    // 0.2 / 0.5 = 0.4
-    // 0.4 / 0.5 = 0.8
-    // Result should be three 0.5s and one 0.8
     expect(buildAudioFilter(0.1, false)).toBe("atempo=0.5,atempo=0.5,atempo=0.5,atempo=0.8");
   });
-
   it("should chain multiple 2.0x filters and a remainder for 3.0x speed", () => {
-    // 3.0 / 2.0 = 1.5
     expect(buildAudioFilter(3, false)).toBe("atempo=2.0,atempo=1.5");
   });
-
   it("should handle boundary values inside the 0.5x-2.0x range without chaining", () => {
     expect(buildAudioFilter(0.5, false)).toBe("atempo=0.5");
+<<<<<<< HEAD
     expect(buildAudioFilter(2.0, false)).toBe("atempo=2"); // Note: Number(2.0.toFixed(4)) -> 2
+=======
+    expect(buildAudioFilter(2.0, false)).toBe("atempo=2");
+>>>>>>> 286e9fb (fix: add noiseReduction to EditRecipe type and fix test argument counts)
     expect(buildAudioFilter(1.5, false)).toBe("atempo=1.5");
     expect(buildAudioFilter(0.75, false)).toBe("atempo=0.75");
   });
-
   it("should chain properly for very large speeds", () => {
+<<<<<<< HEAD
     // 10 / 2.0 = 5
     // 5 / 2.0 = 2.5
     // 2.5 / 2.0 = 1.25
@@ -44,5 +38,8 @@ describe("buildAudioFilter", () => {
   it("should append loudnorm filter when normalizeAudio is true", () => {
     const result = buildAudioFilter(1, true);
     expect(result).toContain("loudnorm");
+=======
+    expect(buildAudioFilter(10, false)).toBe("atempo=2.0,atempo=2.0,atempo=2.0,atempo=1.25");
+>>>>>>> 286e9fb (fix: add noiseReduction to EditRecipe type and fix test argument counts)
   });
-});
+});

src/lib/types.ts

@@ -30,6 +30,7 @@ export interface EditRecipe {
   format: "mp4" | "webm" | "mkv" | "gif";
   stabilization: boolean;
   denoise: boolean;
+  noiseReduction: 'off' | 'light' | 'medium' | 'heavy';
   brightness: number;
   contrast: number;
   saturation: number;
@@ -75,6 +76,39 @@ export type ExportStatus =
   | "done"
   | "error";
 
+export const SPEED_STEPS = [
+  0.25,
+  0.5,
+  0.75,
+  1,
+  1.25,
+  1.5,
+  2,
+  4,
+] as const;
+
+export const DEFAULT_RECIPE: EditRecipe = {
+  preset: "vertical-9-16",
+  customWidth: 1920,
+  customHeight: 1080,
+  framing: "fit",
+  trimStart: 0,
+  trimEnd: null,
+  rotate: 0,
+  keepAudio: true,
+  normalizeAudio: false,
+  speed: 1,
+  quality: 23,
+  format: "mp4",
+  stabilization: false,
+  noiseReduction: 'off',
+  brightness: 0,
+  contrast: 0,
+  saturation: 0,
+  soundOnCompletion: false,
+};
+
+>>>>>>> 92b9083 (feat: add noise reduction filter with Light/Medium/Heavy presets (closes #129))
 export const MAX_FILE_SIZE =
   2 * 1024 * 1024 * 1024;