RealMedia Variable Bitrate (RMVB) is a variable bitrate extension of the RealMedia multimedia container format developed by RealNetworks.
As opposedhttp://tempuri.org/tempuri.html to the more common RealMedia container, which holds streaming media encoded at a constant bitrate (CBR), RMVB is typically used for multimedia content stored locally. Files using this format have the file extension ".rmvb".
A WebM file consists of VP8 video and Vorbis audio streams, in a container based on a profile of Matroska. The project releases WebM related software under a BSD license and all users are granted a worldwide, non-exclusive, no-charge, royalty-free patent license.
Native WebM support by Mozilla Firefox, Opera, and Google Chrome was announced at the 2010 Google I/O conference. Internet Explorer 9 requires third-party WebM software. Safari for Windows and Mac OS X relies on QuickTime to play web media, which as of 1 April 2011, does not support WebM unless a third-party plug-in is installed. In January 2011, Google announced that the WebM Project Team will release plugins for Internet Explorer and Safari to allow playback of WebM files through the standard HTML5 tag. As of 9 June 2012, a public preview version of this plug-in is available for Internet Explorer 9.
AMD, ARM and Broadcom have announced support for hardware acceleration of the WebM format. Intel is also considering hardware-based acceleration for WebM in its Atom-based TV chips if the format gains popularity. Qualcomm and Texas Instruments have announced support, with native support coming to the TI OMAP processor.
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