feat(server): enhanced thumbnails generation code (#2147)

* Add size parameter to extractVideoThumbnail

* Ensure minimum dimension of webp thumbnail

server/libs/infra/src/repositories/media.repository.ts

@@ -11,7 +11,11 @@ export class MediaRepository implements IMediaRepository {
   async resize(input: string, output: string, options: ResizeOptions): Promise<void> {
     switch (options.format) {
       case 'webp':
-        await sharp(input, { failOnError: false }).resize(250).webp().rotate().toFile(output);
+        await sharp(input, { failOnError: false })
+          .resize(options.size, options.size, { fit: 'outside', withoutEnlargement: true })
+          .webp()
+          .rotate()
+          .toFile(output);
         return;
 
       case 'jpeg':
@@ -24,10 +28,14 @@ export class MediaRepository implements IMediaRepository {
     }
   }
 
-  extractVideoThumbnail(input: string, output: string) {
+  extractVideoThumbnail(input: string, output: string, size: number) {
     return new Promise<void>((resolve, reject) => {
       ffmpeg(input)
-        .outputOptions(['-ss 00:00:00.000', '-frames:v 1'])
+        .outputOptions([
+          '-ss 00:00:00.000',
+          '-frames:v 1',
+          `-vf scale='min(${size},iw)':'min(${size},ih)':force_original_aspect_ratio=increase`,
+        ])
         .output(output)
         .on('error', reject)
         .on('end', resolve)