You just need to copy page URL, or right click on the video to select "Copy video address", then paste the URL into the search box of Distill Video (http://distillvideo.com) and press “Start” button. After waiting almost 2-3 seconds, the video section showed, choose your preferred format and right click the "Download" button, then click "Save link as..." to download the video or audio into your computer or phone. So you also can call it "tweet video downloader".
The web browser Safari can be served as a Safari YouTube downloader, which offers an easy way to download any HD 720P/1080P videos on YouTube as well as other web. And for a successful YouTube videos download on Mac OS X, please make sure you have the latest version of Safari. Follow the detailed guides and learn how to download YouTube videos on Mac using Safari.
When you copy a YouTube URL (even for a playlist), click in the WinX software to launch. You start with the "analyzer," which checks all the options. This tool also tried to default to the 1,920-by-1,080 version in MP4; I picked the 4K version (3,840 by 2,160 pixels) in WebM format, a subset of the MKV format—you can rename a .webm file to a .mkv and it'll work fine. In settings there are options to default to WebM at highest res. You can set up a number of videos to back up before you even click the download button. The 4K 575.4MB file took 1 minute and 39 seconds to download, more than double that of 4K Video Downloader.

There are workarounds. One is using a free iOS file manager app like Documents by Readdle. Use the Safari browser to visit a YouTube video, and use the Share option to find Copy Link. Then go back to Documents, and use the built-in browser in the app to surf to a video download helper site like SaveFrom.net. Paste the link into the form (hold your finger down on it until you get "Paste" menu to pop up). The site will give you the links to download, and you can save the file to Documents. Hold down and drag the file up, until you're back on the main screen, then drag it to the Photos folder. You'll need to give Documents permission to access Photos the first time. You can then access the video like you would any video taken on the phone or tablet—in the Photos app.

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