HTML5 offline video caching in mobile safari

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开发者_C百科? I've tried both object embed and the video tags.

Sadly there’s a ~5 MB limit on offline cache in Mobile Safari. Not much you can do about it.

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.

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.

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.

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.

Perhaps something like this would work: http://www.nihilogic.dk/labs/jsvideo/test2.php

i have read it needs an html5 manifest setup to cache files