Auto-transcode on upload, show transcode status to user

backend/src/routes/videos.ts

@@ -9,6 +9,7 @@ import {
     getVideoByMapAndPlayer,
     updateVideoPB,
     updateTranscodedKey,
+    updateTranscodeStatus,
 } from "../services/db";
 import {
     uploadObject,
@@ -335,6 +336,26 @@ export const videoRoutes = new Elysia({ prefix: "/api/videos" })
 
         await completeMultipartUpload(video.videoKey, uploadId, s3Parts);
 
+        // Auto-transcode in background
+        if (
+            !video.transcodedKey &&
+            video.transcodeStatus !== "pending" &&
+            video.transcodeStatus !== "processing"
+        ) {
+            updateTranscodeStatus(id, "pending");
+            const videoKey = video.videoKey;
+            transcodeVideo(videoKey)
+                .then((transcodedKey) => {
+                    updateTranscodedKey(id, transcodedKey);
+                    updateTranscodeStatus(id, "done");
+                    console.log(`[transcode] Done: ${id} -> ${transcodedKey}`);
+                })
+                .catch((err) => {
+                    console.error(`[transcode] Failed: ${id}`, err);
+                    updateTranscodeStatus(id, "failed");
+                });
+        }
+
         return {
             ...video,
             videoUrl: getStreamUrl(video.id),
@@ -349,6 +370,16 @@ export const videoRoutes = new Elysia({ prefix: "/api/videos" })
         const video = getVideoById(id);
         if (!video) return status(404, { error: "Not found" });
 
+        if (
+            video.transcodeStatus === "processing" ||
+            video.transcodeStatus === "pending"
+        ) {
+            return status(409, {
+                error: "Transcode already in progress",
+                transcodeStatus: video.transcodeStatus,
+            });
+        }
+
         if (video.transcodedKey) {
             return {
                 ...video,
@@ -360,18 +391,23 @@ export const videoRoutes = new Elysia({ prefix: "/api/videos" })
             };
         }
 
-        const transcodedKey = await transcodeVideo(video.videoKey);
-        updateTranscodedKey(id, transcodedKey);
+        // Mark as pending and return immediately
+        updateTranscodeStatus(id, "pending");
 
-        return {
-            ...video,
-            transcodedKey,
-            videoUrl: getStreamUrl(video.id),
-            mtvUrl: getObjectUrl(video.mtvKey),
-            thumbnailUrl: video.thumbnailKey
-                ? getObjectUrl(video.thumbnailKey)
-                : undefined,
-        };
+        // Run transcode in background
+        const videoKey = video.videoKey;
+        transcodeVideo(videoKey)
+            .then((transcodedKey) => {
+                updateTranscodedKey(id, transcodedKey);
+                updateTranscodeStatus(id, "done");
+                console.log(`[transcode] Done: ${id} -> ${transcodedKey}`);
+            })
+            .catch((err) => {
+                console.error(`[transcode] Failed: ${id}`, err);
+                updateTranscodeStatus(id, "failed");
+            });
+
+        return { id, transcodeStatus: "pending" };
     })
 
     .get("/:id/stream", async ({ params: { id }, request, set }) => {