fix(server): encodes iPhone 16 Pro video with unknown audio codec (#13593)

* fix(server): encodes iPhone 16 Pro video with unknown audio codec

* remove white space

* pr feedback + unit test

* remove public method keyword

* test the service

* correcting unit test

server/src/services/media.service.spec.ts

@@ -2292,6 +2292,22 @@ describe(MediaService.name, () => {
 
       expect(mediaMock.probe).toHaveBeenCalledWith(assetStub.video.originalPath, { countFrames: false });
     });
+
+    it('should process unknown audio stream', async () => {
+      mediaMock.probe.mockResolvedValue(probeStub.audioStreamUnknown);
+      assetMock.getByIds.mockResolvedValue([assetStub.video]);
+      await sut.handleVideoConversion({ id: assetStub.video.id });
+
+      expect(mediaMock.transcode).toHaveBeenCalledWith(
+        '/original/path.ext',
+        'upload/encoded-video/user-id/as/se/asset-id.mp4',
+        expect.objectContaining({
+          inputOptions: expect.any(Array),
+          outputOptions: expect.arrayContaining(['-c:a copy']),
+          twoPass: false,
+        }),
+      );
+    });
   });
 
   describe('isSRGB', () => {

server/src/services/media.service.ts

@@ -349,7 +349,9 @@ export class MediaService extends BaseService {
   }
 
   private getMainStream<T extends VideoStreamInfo | AudioStreamInfo>(streams: T[]): T {
-    return streams.sort((stream1, stream2) => stream2.frameCount - stream1.frameCount)[0];
+    return streams
+      .filter((stream) => stream.codecName !== 'unknown')
+      .sort((stream1, stream2) => stream2.frameCount - stream1.frameCount)[0];
   }
 
   private getTranscodeTarget(

server/test/fixtures/media.stub.ts

@@ -154,6 +154,13 @@ export const probeStub = {
     ...probeStubDefault,
     audioStreams: [{ index: 1, codecName: 'aac', frameCount: 100 }],
   }),
+  audioStreamUnknown: Object.freeze<VideoInfo>({
+    ...probeStubDefault,
+    audioStreams: [
+      { index: 0, codecName: 'aac', frameCount: 100 },
+      { index: 1, codecName: 'unknown', frameCount: 200 },
+    ],
+  }),
   matroskaContainer: Object.freeze<VideoInfo>({
     ...probeStubDefault,
     format: {