feat(export): add native aspect ratio option for background-free exports

src/components/video-editor/VideoEditor.tsx

@@ -1156,9 +1156,10 @@ export default function VideoEditor() {
         videoPlaybackRef.current?.pause();
       }
 
-      const aspectRatioValue = getAspectRatioValue(aspectRatio);
       const sourceWidth = video.videoWidth || 1920;
       const sourceHeight = video.videoHeight || 1080;
+      const sourceAspectRatio = sourceHeight > 0 ? sourceWidth / sourceHeight : 16 / 9;
+      const aspectRatioValue = getAspectRatioValue(aspectRatio, sourceAspectRatio);
 
       // Get preview CONTAINER dimensions for scaling
       const playbackRef = videoPlaybackRef.current;
@@ -1241,7 +1242,10 @@ export default function VideoEditor() {
           exportWidth = sourceWidth;
           exportHeight = sourceHeight;
 
-          if (aspectRatioValue === 1) {
+          if (aspectRatio === 'native') {
+            exportWidth = Math.floor(sourceWidth / 2) * 2;
+            exportHeight = Math.floor(sourceHeight / 2) * 2;
+          } else if (aspectRatioValue === 1) {
             // Square (1:1): use smaller dimension to avoid codec limits
             const baseDimension = Math.floor(Math.min(sourceWidth, sourceHeight) / 2) * 2;
             exportWidth = baseDimension;
@@ -1544,7 +1548,13 @@ export default function VideoEditor() {
               <div className="w-full h-full flex flex-col items-center justify-center bg-black/40 rounded-2xl border border-white/5 shadow-2xl overflow-hidden">
                 {/* Video preview */}
                 <div className="w-full flex justify-center items-center" style={{ flex: '1 1 auto', margin: '6px 0 0' }}>
-                  <div className="relative" style={{ width: 'auto', height: '100%', aspectRatio: getAspectRatioValue(aspectRatio), maxWidth: '100%', margin: '0 auto', boxSizing: 'border-box' }}>
+                  <div className="relative" style={{ width: 'auto', height: '100%', aspectRatio: getAspectRatioValue(aspectRatio, (() => {
+                    const previewVideo = videoPlaybackRef.current?.video;
+                    if (previewVideo && previewVideo.videoHeight > 0) {
+                      return previewVideo.videoWidth / previewVideo.videoHeight;
+                    }
+                    return 16 / 9;
+                  })()), maxWidth: '100%', margin: '0 auto', boxSizing: 'border-box' }}>
                     <VideoPlayback
                       key={videoPath || 'no-video'}
                       aspectRatio={aspectRatio}

src/components/video-editor/VideoPlayback.tsx

@@ -1029,8 +1029,20 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(({
     ? { backgroundImage: `url(${resolvedWallpaper || ''})` }
     : { background: resolvedWallpaper || '' };
 
+  const nativeAspectRatio = (() => {
+    const locked = lockedVideoDimensionsRef.current;
+    if (locked && locked.height > 0) {
+      return locked.width / locked.height;
+    }
+    const video = videoRef.current;
+    if (video && video.videoHeight > 0) {
+      return video.videoWidth / video.videoHeight;
+    }
+    return 16 / 9;
+  })();
+
   return (
-    <div className="relative rounded-sm overflow-hidden" style={{ width: '100%', aspectRatio: formatAspectRatioForCSS(aspectRatio) }}>
+    <div className="relative rounded-sm overflow-hidden" style={{ width: '100%', aspectRatio: formatAspectRatioForCSS(aspectRatio, nativeAspectRatio) }}>
       {/* Background layer - always render as DOM element with blur */}
       <div
         className="absolute inset-0 bg-cover bg-center"

src/utils/aspectRatioUtils.ts

@@ -1,4 +1,4 @@
-export const ASPECT_RATIOS = ['16:9', '9:16', '1:1', '4:3', '4:5', '16:10', '10:16'] as const;
+export const ASPECT_RATIOS = ['native', '16:9', '9:16', '1:1', '4:3', '4:5', '16:10', '10:16'] as const;
 
 export type AspectRatio = typeof ASPECT_RATIOS[number];
 
@@ -7,8 +7,9 @@ export type AspectRatio = typeof ASPECT_RATIOS[number];
  * Uses exhaustive type checking to ensure all AspectRatio cases are handled.
  * If TypeScript errors here, a new ratio was added to the type but not handled.
  */
-export function getAspectRatioValue(aspectRatio: AspectRatio): number {
+export function getAspectRatioValue(aspectRatio: AspectRatio, nativeAspectRatio = 16 / 9): number {
   switch (aspectRatio) {
+    case 'native': return nativeAspectRatio > 0 ? nativeAspectRatio : 16 / 9;
     case '16:9': return 16 / 9;
     case '9:16': return 9 / 16;
     case '1:1':  return 1;
@@ -26,9 +27,10 @@ export function getAspectRatioValue(aspectRatio: AspectRatio): number {
 
 export function getAspectRatioDimensions(
   aspectRatio: AspectRatio,
-  baseWidth: number
+  baseWidth: number,
+  nativeAspectRatio?: number,
 ): { width: number; height: number } {
-  const ratio = getAspectRatioValue(aspectRatio);
+  const ratio = getAspectRatioValue(aspectRatio, nativeAspectRatio);
   return {
     width: baseWidth,
     height: baseWidth / ratio,
@@ -36,11 +38,17 @@ export function getAspectRatioDimensions(
 }
 
 export function getAspectRatioLabel(aspectRatio: AspectRatio): string {
+  if (aspectRatio === 'native') {
+    return 'Native';
+  }
   return aspectRatio;
 }
 
 
-export function formatAspectRatioForCSS(aspectRatio: AspectRatio): string {
+export function formatAspectRatioForCSS(aspectRatio: AspectRatio, nativeAspectRatio = 16 / 9): string {
+  if (aspectRatio === 'native') {
+    return `${nativeAspectRatio > 0 ? nativeAspectRatio : 16 / 9}`;
+  }
   return aspectRatio.replace(':', '/');
 }