For sure, you can use any devices that can browse website to download the video or audio. You just need to open DistillVideo on your iphone, iPad or other smart phones (DistillVideo also can be used as youtube video downloader for android), then past the video url into the search box, after waiting for 1-3 seconds to display the results, Touch and hold the "Download" button, then click "Download link" to save the file to your device. That's all. Then enjoy watching it offline.
VidPaw is a versatile and totally free URL video downloader, which has the ability to download online videos from over 1000 sites with high quality, for example, download videos from YouTube, Twitter, Vimeo, and Facebook private videos, download Instagram videos and so forth. Moreover, it supports Windows, Mac, iPhone, iPad, Android Phone/Tablets. What’s more, there is no need to download any software or app on your devices. And you can simply reach the result with VidPaw.com. To download online videos with VidPaw, you just need simple steps.
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".
Another workaround: Go back to the desktop and try AnyTrans ($39.99 for a single computer), a file manager for iOS devices that has an integrated downloader supporting 900 sites, including YouTube and Facebook. It'll transfer the videos to the iPhone for you over the USB cable. Even if you don't pay for AnyTrans, the download option remains and is free forever.
Remember that problem of using Chrome extensions from the Google Web Store? You're going to have an even bigger issue when you want to download from YouTube using an Android app from the Google Play store, where Google has an even tighter grip. (Nor can you actually download anything with your officially sanctioned YouTube apps. Unless you live in India.)
Do you prefer to avoid installing software? Video download helper sites do the download work for you, providing conversion and then a download link—you don't have to install anything on your PC. It can take a lot longer, depending on the size and quality of the video you want—a typical two-minute movie trailer in 1080p can be around 30MB—but you can't beat the convenience.
The same as you do to download any other videos. You just need to choose the 1080p or 4k format in the video result section, sometimes it is in the "video only" section that without sound, then you have to download the audio file (M4A) in the same result section, then you can load the video file and audio files together on your computer using the video playing software, such as VLC. You also can combine the video and audio files by using ffmpeg. Some youtube video does not have HD format originally, in such case, you definitely can not download any HD format video.