From 999a0d0e850e8bb539a7e771feb3b9afeddb26e7 Mon Sep 17 00:00:00 2001
From: orfelorfel23 <jannik.mueller.jannik+git@googlemail.com>
Date: Sun, 9 Aug 2026 23:38:49 +0200
Subject: [PATCH] Fix FFmpeg WebM VP9 Alpha decoding issue during transcode

---
 server.mjs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/server.mjs b/server.mjs
index caeef9d..c5aac63 100644
--- a/server.mjs
+++ b/server.mjs
@@ -387,7 +387,12 @@ async function runSequentialEncodes(session, inputVideoPath, inputAudioPath, tar
     session.currentStatus = `Rendere ${i+1}/${targetFormats.length}: ${formatId.toUpperCase()}...`;
     saveHistory();
     
-    const ffmpegArgs = ['-y', '-i', inputVideoPath];
+    const ffmpegArgs = ['-y'];
+    if (inputVideoPath.toLowerCase().endsWith('.webm')) {
+      ffmpegArgs.push('-c:v', 'libvpx-vp9');
+    }
+    ffmpegArgs.push('-i', inputVideoPath);
+    
     if (inputAudioPath) {
       ffmpegArgs.push('-i', inputAudioPath);
     }