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I know how to launch a youtube video within an iOS web view, but how can I download that video to save on my iPad app? Is it possible? Do I need to use some call with a NSURLConnection object and then save the received data into the proper file format?
One specific point I am unsure about is what the url to request the file would be. When viewing a video on youtube, the downloadable videos are triggered with a button, so it’s not evident to me what the url would be.
You would need to download an iOS-compatible version of the video, possibly using the same technique employed by the Safari FlashToHTML5 plugin.
Youtube DOES offer video download links:
http://lifehacker.com/#!5152236/youtube-offers-official-downloads-and-purchases-for-videos
.. make sure you do not violate their TOS.
In general, when downloading large files, you might consider implementing resumable file downloads, especially because connectivity on a mobile device is transient.
On top of that, make sure that you’re on a wifi network when downloading (or resuming a download), using Reachability. Note that excessive bandwidth usage over cellular networks is a reason for app rejection.