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| Error Message | Cause | Java Solution | | :--- | :--- | :--- | | HTTP 403 Forbidden | YouTube blocked your IP due to rapid requests | Add --sleep-interval 5 or use Thread.sleep(3000) between downloads | | signature cipher | Old library cannot decrypt the n-parameter | Update your wrapper library or switch to yt-dlp subprocess | | Video unavailable | Age-restricted or private video | Add cookie export: --cookies cookies.txt in your command | | OutOfMemoryError | Downloading a 4K 60fps video | Use streaming buffer; don't load entire video into RAM | | ffmpeg not found | Merging video+audio requires FFmpeg | Download FFmpeg and add it to PATH or specify path in ProcessBuilder | If you are looking for software specifically built