fix(server): override reserved color metadata for video thumbnails

server/src/repositories/media.repository.ts

@@ -203,6 +203,9 @@ export class MediaRepository {
           isHDR: stream.color_transfer === 'smpte2084' || stream.color_transfer === 'arib-std-b67',
           bitrate: this.parseInt(stream.bit_rate),
           pixelFormat: stream.pix_fmt || 'yuv420p',
+          colorPrimaries: stream.color_primaries,
+          colorSpace: stream.color_space,
+          colorTransfer: stream.color_transfer,
         })),
       audioStreams: results.streams
         .filter((stream) => stream.codec_type === 'audio')

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

@@ -445,6 +445,7 @@ describe(MediaService.name, () => {
         }),
       );
     });
+
     it('should not skip intra frames for MTS file', async () => {
       mocks.media.probe.mockResolvedValue(probeStub.videoStreamMTS);
       mocks.assetJob.getForGenerateThumbnailJob.mockResolvedValue(assetStub.video);
@@ -462,6 +463,25 @@ describe(MediaService.name, () => {
       );
     });
 
+    it('should override reserved color metadata', async () => {
+      mocks.media.probe.mockResolvedValue(probeStub.videoStreamReserved);
+      mocks.assetJob.getForGenerateThumbnailJob.mockResolvedValue(assetStub.video);
+      await sut.handleGenerateThumbnails({ id: assetStub.video.id });
+
+      expect(mocks.media.transcode).toHaveBeenCalledWith(
+        '/original/path.ext',
+        expect.any(String),
+        expect.objectContaining({
+          inputOptions: expect.arrayContaining([
+            '-bsf:v hevc_metadata=colour_primaries=1:matrix_coefficients=1:transfer_characteristics=1',
+          ]),
+          outputOptions: expect.any(Array),
+          progress: expect.any(Object),
+          twoPass: false,
+        }),
+      );
+    });
+
     it('should use scaling divisible by 2 even when using quick sync', async () => {
       mocks.media.probe.mockResolvedValue(probeStub.videoStream2160p);
       mocks.systemMetadata.get.mockResolvedValue({ ffmpeg: { accel: TranscodeHardwareAcceleration.Qsv } });

server/src/types.ts

@@ -88,6 +88,9 @@ export interface VideoStreamInfo {
   isHDR: boolean;
   bitrate: number;
   pixelFormat: string;
+  colorPrimaries?: string;
+  colorSpace?: string;
+  colorTransfer?: string;
 }
 
 export interface AudioStreamInfo {

server/src/utils/media.ts

@@ -392,9 +392,30 @@ export class ThumbnailConfig extends BaseConfig {
 
   getBaseInputOptions(videoStream: VideoStreamInfo, format?: VideoFormat): string[] {
     // skip_frame nointra skips all frames for some MPEG-TS files. Look at ffmpeg tickets 7950 and 7895 for more details.
-    return format?.formatName === 'mpegts'
-      ? ['-sws_flags accurate_rnd+full_chroma_int']
-      : ['-skip_frame nointra', '-sws_flags accurate_rnd+full_chroma_int'];
+    const options =
+      format?.formatName === 'mpegts'
+        ? ['-sws_flags accurate_rnd+full_chroma_int']
+        : ['-skip_frame nointra', '-sws_flags accurate_rnd+full_chroma_int'];
+
+    const metadataOverrides = [];
+    if (videoStream.colorPrimaries === 'reserved') {
+      metadataOverrides.push('colour_primaries=1');
+    }
+
+    if (videoStream.colorSpace === 'reserved') {
+      metadataOverrides.push('matrix_coefficients=1');
+    }
+
+    if (videoStream.colorTransfer === 'reserved') {
+      metadataOverrides.push('transfer_characteristics=1');
+    }
+
+    if (metadataOverrides.length > 0) {
+      // workaround for https://fftrac-bg.ffmpeg.org/ticket/11020
+      options.push(`-bsf:v ${videoStream.codecName}_metadata=${metadataOverrides.join(':')}`);
+    }
+
+    return options;
   }
 
   getBaseOutputOptions() {

server/test/fixtures/media.stub.ts

@@ -261,4 +261,15 @@ export const probeStub = {
       bitrate: 0,
     },
   }),
+  videoStreamReserved: Object.freeze<VideoInfo>({
+    ...probeStubDefault,
+    videoStreams: [
+      {
+        ...probeStubDefaultVideoStream[0],
+        colorPrimaries: 'reserved',
+        colorSpace: 'reserved',
+        colorTransfer: 'reserved',
+      },
+    ],
+  }),
 };