fix(downloads): preserve audio track selection for offline playback

providers/Downloads/hooks/useDownloadEventHandlers.ts

@@ -235,6 +235,9 @@ export function useDownloadEventHandlers({
             trickPlayData,
             introSegments,
             creditSegments,
+            audioStreamIndex,
+            subtitleStreamIndex,
+            isTranscoding,
           } = process;
           const videoFile = new File(filePathToUri(event.filePath));
           const fileInfo = videoFile.info();
@@ -258,8 +261,9 @@ export function useDownloadEventHandlers({
             introSegments,
             creditSegments,
             userData: {
-              audioStreamIndex: 0,
-              subtitleStreamIndex: 0,
+              audioStreamIndex: audioStreamIndex ?? 0,
+              subtitleStreamIndex: subtitleStreamIndex ?? -1,
+              isTranscoded: isTranscoding ?? false,
             },
           };
 

providers/Downloads/hooks/useDownloadOperations.ts

@@ -58,6 +58,8 @@ export function useDownloadOperations({
       item: BaseItemDto,
       mediaSource: MediaSourceInfo,
       maxBitrate: Bitrate,
+      audioStreamIndex?: number,
+      subtitleStreamIndex?: number,
     ) => {
       if (!api || !item.Id || !authHeader) {
         console.warn("startBackgroundDownload ~ Missing required params");
@@ -114,6 +116,8 @@ export function useDownloadOperations({
           trickPlayData: additionalAssets.trickPlayData,
           introSegments: additionalAssets.introSegments,
           creditSegments: additionalAssets.creditSegments,
+          audioStreamIndex,
+          subtitleStreamIndex,
         };
 
         // Add to processes

providers/Downloads/types.ts

@@ -21,6 +21,8 @@ interface UserData {
   subtitleStreamIndex: number;
   /** The last known audio stream index. */
   audioStreamIndex: number;
+  /** Whether the downloaded file was transcoded (has only one audio track). */
+  isTranscoded: boolean;
 }
 
 /** Represents a segment of time in a media item, used for intro/credit skipping. */
@@ -142,4 +144,8 @@ export type JobStatus = {
   introSegments?: MediaTimeSegment[];
   /** Pre-downloaded credit segments (optional) - downloaded before video starts */
   creditSegments?: MediaTimeSegment[];
+  /** The audio stream index selected for this download */
+  audioStreamIndex?: number;
+  /** The subtitle stream index selected for this download */
+  subtitleStreamIndex?: number;
 };