feat: add video sharpening filter option

src/components/VideoEditor.tsx

@@ -250,6 +250,30 @@ export default function VideoEditor() {
                           className="w-full"
                         />
                       </div>
+                      {/* Sharpness */}
+                      <div className="space-y-2">
+                        <div className="flex items-center justify-between text-xs">
+                          <label htmlFor="sharpness-slider">Sharpness</label>
+                          <button
+                            type="button"
+                            onClick={() => updateRecipe({ sharpness: 0 })}
+                            className="text-film-500 hover:underline"
+                          >
+                            Reset
+                          </button>
+                        </div>
+                        <input
+                          id="sharpness-slider"
+                          type="range"
+                          min="0"
+                          max="3"
+                          step="1"
+                          value={recipe.sharpness}
+                          onChange={(e) => updateRecipe({ sharpness: Number(e.target.value) })}
+                          aria-label="Adjust sharpness"
+                          className="w-full"
+                        />
+                      </div>
                     </div>
                   </Section>
                   <Section icon={<SlidersHorizontal size={12} />} title="Output format" delay={190}>

src/hooks/useVideoEditor.ts

@@ -106,6 +106,10 @@ function validateRecipe(recipe: EditRecipe, duration: number ): string | null {
       recipe.saturation < 0 || recipe.saturation > 3,
       "Saturation must be between 0 and 3.",
     ],
+    [
+      recipe.sharpness < 0 || recipe.sharpness > 3,
+      "Sharpness must be between 0 and 3.",
+    ],
   ];
 
   return (

src/lib/constants.ts

@@ -19,5 +19,6 @@ export const DEFAULT_RECIPE: EditRecipe = {
   saturation: 1,
   stabilization: false,
   soundOnCompletion: false,
+  sharpness: 0,
   normalizeAudio: false,
 };

src/lib/ffmpeg.ts

@@ -120,6 +120,9 @@ function buildVideoFilter(recipe: EditRecipe, targetW: number, targetH: number):
       `crop=${targetW}:${targetH}`
     );
   }
+  if (recipe.sharpness !== 0) {
+    filters.push(`unsharp=5:5:${recipe.sharpness}:5:5:0.0`);
+  }
 
   if (recipe.speed !== 1) {
     const pts = (1 / recipe.speed).toFixed(4);

src/lib/types.ts

@@ -16,6 +16,7 @@ export interface EditRecipe {
   contrast: number;
   saturation: number;
   soundOnCompletion: boolean;
+  sharpness: number;
 }
 
 export type OverlayPosition =
@@ -82,6 +83,7 @@ export const DEFAULT_RECIPE: EditRecipe = {
   contrast: 0,
   saturation: 0,
   soundOnCompletion: false,
+  sharpness: 1,
 };
 
 export const MAX_FILE_SIZE =