diff --git a/services/worker/src/workers/conform.js b/services/worker/src/workers/conform.js
index 77cb3fc..07cbc3e 100644
--- a/services/worker/src/workers/conform.js
+++ b/services/worker/src/workers/conform.js
@@ -1,6 +1,7 @@
 import { join } from 'path';
 import { unlink, writeFile, mkdir, rm } from 'fs/promises';
 import { tmpdir } from 'os';
+import { Queue } from 'bullmq';
 import { query } from '../db/client.js';
 import { downloadFromS3, uploadToS3 } from '../s3/client.js';
 import { trimSegment, concatSegments, runFFmpeg, getMediaInfo } from '../ffmpeg/executor.js';
@@ -9,6 +10,19 @@ import { XMLParser } from 'fast-xml-parser';
 
 const S3_BUCKET = process.env.S3_BUCKET || 'wild-dragon';
 
+// Used to queue a proxy build for the conformed output so the library /
+// asset viewer has a browser-playable H.264 preview. Without this the
+// browser hits MEDIA_ERR_SRC_NOT_SUPPORTED on ProRes / DNxHR outputs.
+const parseRedisUrl = (url) => {
+  try {
+    const parsed = new URL(url);
+    return { host: parsed.hostname, port: parseInt(parsed.port, 10) || 6379 };
+  } catch { return { host: 'localhost', port: 6379 }; }
+};
+const proxyQueue = new Queue('proxy', {
+  connection: parseRedisUrl(process.env.REDIS_URL || 'redis://queue:6379'),
+});
+
 const xmlParser = new XMLParser({
   ignoreAttributes: false,
   attributeNamePrefix: '@_',
@@ -353,10 +367,30 @@ export const conformWorker = async (job) => {
       ]
     );
 
-    await job.updateProgress(100);
-    console.log(`[conform] Job ${jobId} complete → asset ${assetRes.rows[0].id}`);
+    const newAssetId = assetRes.rows[0].id;
 
-    return { jobId, outputKey, assetId: assetRes.rows[0].id };
+    // Queue a proxy build so the library has a browser-playable H.264 file.
+    // ProRes / DNxHR masters don't decode in HTML5 video; without this step
+    // the asset shows MEDIA_ERR_SRC_NOT_SUPPORTED in the player. Mirror the
+    // ingest pipeline's pattern (services/mam-api/src/routes/assets.js).
+    try {
+      const generatedProxyKey = `proxies/${newAssetId}.mp4`;
+      await proxyQueue.add('generate', {
+        assetId:   newAssetId,
+        inputKey:  outputKey,
+        outputKey: generatedProxyKey,
+      });
+      console.log(`[conform] queued proxy build for ${newAssetId}`);
+    } catch (e) {
+      // Don't fail the conform job if the proxy queue is unreachable —
+      // the asset still exists, an operator can retrigger the proxy.
+      console.warn(`[conform] failed to queue proxy for ${newAssetId}: ${e.message}`);
+    }
+
+    await job.updateProgress(100);
+    console.log(`[conform] Job ${jobId} complete → asset ${newAssetId}`);
+
+    return { jobId, outputKey, assetId: newAssetId };
 
   } catch (error) {
     console.error(`[conform] Error in job ${jobId}:`, error);