Apple on Thursday released an update for the iPhone SDK, bringing the current version of the SDK to 3.1.2.

The new SDK 3.1.2, which now includes Xcode 3.2.1, is available in versions that are compatible with Leopard and Snow Leopard for iPhone and iPod Touch developers.

The update contains general bug fixes for the SDK and Xcode. Dashcode is reported to now support the creation of Web applications that are optimized for Safari on the iPhone, PC, and Mac.

If you’ve used this new update, please tell us about your experiences with it in the comments.

Safari supports audio and video viewing in a webpage on the desktop and iPhone OS. You can use audio and video HTML elements or use the embed element to use the native application for video playback. In either case, you need to ensure that the video you create is optimized for the platform and different bandwidths.

iPhone OS streams movies and audio using HTTP over EDGE, 3G, and Wi-Fi networks. iPhone OS uses a native application to play back video even when video is embedded in your webpages. Video automatically expands to the size of the screen and rotates when the user changes orientation. The controls automatically hide when they are not in use and appear when the user taps the screen. This is the experience the user expects when viewing all video on iPhone OS.

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