问题
I can't seem to get Safari on the iPhone or iPad to offline cache videos. Everything else gets cached just fine when I go offline. The video file is obviously in the manifest, but I just get the broken arrow. Works fine in Safari desktop. Any clues? I've tried both object embed and the video tags.
回答1:
Sadly there’s a ~5 MB limit on offline cache in Mobile Safari. Not much you can do about it.
回答2:
See these two articles for mobile browser cache limits (note that the second one adds vital information):
http://www.yuiblog.com/blog/2010/06/28/mobile-browser-cache-limits/
http://www.yuiblog.com/blog/2010/07/12/mobile-browser-cache-limits-revisited/
It only generically covers html and "external resources", but they didn't explicitly test video files, so maybe these are never cached by Mobile Safari.
回答3:
Audio & video are not cached by iPhone since they are played by external applications. It seems the only workaround is to store them as base64 in local database or have them cached in application manifest as php(or similar) file but with base64 encoded audio and video content.
回答4:
Use the manifest to cache the html pages containing the video tag, then tell your web server to expire the video in 30 years. That way the video will be in the browser cache not the manifest cache.
回答5:
Update for iOS 4.3 on iPad:
I just tried adding a movie to a manifest file in iOS 4.3.
Safari asked me to allow extending the offline storage and then downloaded the movie.
回答6:
Perhaps something like this would work: http://www.nihilogic.dk/labs/jsvideo/test2.php
回答7:
i have read it needs an html5 manifest setup to cache files
来源：https://stackoverflow.com/questions/2956915/html5-offline-video-caching-in-mobile-safari