YouTube Download Video Error

1. Check if the proxy address is filled in correctly. The correct proxy address should be in the format http://127.0.0.1:port_number. Do not enter random content.
2. When downloading a YouTube video, the video and audio are downloaded as two separate files. They are merged into an MP4 file after completion. If you open the video file during the download process, it will have no sound. Please wait patiently for the download to finish and the files to be merged.