The "failed to aggregate" error in Video DownloadHelper (VDH) usually occurs when the extension successfully downloads individual video and audio segments but fails to combine them into a single playable file. This process, known as , typically requires the Video DownloadHelper Companion App or an external tool like FFmpeg to function correctly. Why "Failed to Aggregate" Happens
: If you manually configured FFmpeg, a wrong file path will prevent the tool from launching. video download helper failed to aggregate
: The core browser extension cannot merge files on its own due to browser security limits; it needs the companion app to do the heavy lifting. The "failed to aggregate" error in Video DownloadHelper