fix(transcode): keep webm extension so ffmpeg auto-detects vp9 alpha, and drop qtrle to save disk space

server.mjs

@@ -263,7 +263,12 @@ app.post('/api/export/transcode', upload.fields([
       return res.status(400).json({ error: 'Video-Datei fehlt für Server-Transcoding.' });
     }
 
-    const videoPath = req.files.video[0].path;
+    const videoPathTemp = req.files.video[0].path;
+    const originalName = req.files.video[0].originalname;
+    const isWebmInput = originalName.toLowerCase().endsWith('.webm');
+    const videoPath = videoPathTemp + (isWebmInput ? '.webm' : '.mp4');
+    fs.renameSync(videoPathTemp, videoPath);
+    
     const audioPath = (req.files.audio && req.files.audio[0]) ? req.files.audio[0].path : null;
     const format = req.body.format || 'prores';
     const title = (req.body.title || 'Visualizer').replace(/[^a-zA-Z0-9_-]/g, '_');
@@ -323,7 +328,7 @@ app.post('/api/export/transcode', upload.fields([
     enforceMaxHistory();
 
     // Run sequentially in background
-    runSequentialEncodes(session, videoPath, audioPath, ['prores', 'webm_alpha', 'qtrle', 'mp4']).catch(err => {
+    runSequentialEncodes(session, videoPath, audioPath, ['prores', 'webm_alpha', 'mp4']).catch(err => {
       console.error(`[${sessionId}] Queue Error:`, err);
     });
 
@@ -426,7 +431,7 @@ app.post('/api/export/start', upload.single('audio'), async (req, res) => {
         session.formats.prores.ready = true;
         saveHistory();
         // Start remaining encodes from the ProRes master file using the original audioPath
-        runSequentialEncodes(session, formats.prores.path, audioPath, ['webm_alpha', 'qtrle', 'mp4']).catch(err => {
+        runSequentialEncodes(session, formats.prores.path, audioPath, ['webm_alpha', 'mp4']).catch(err => {
           console.error(`[${sessionId}] Background Queue Error:`, err);
         });
       }