There is no sound also even the videos are downloaded by some paid YouTube downloader or converter. However, many people just find that after they downloaded YouTube videos by some free YouTube downloader/graper, there is no audio at all when playback.
By the help of YouTube downloader/graper/converter, you can easily download YouTube videos to enjoy offline. Downloading and converting YouTube videos is not a difficult task as there are many free and paid YouTube downloaders or YouTube converters.
