You can convert any format video to WebM for html5 video.

WebM supported by Mozilla, Opera, Adobe, Google, IE 9 and more other publishers

WebM converter can help you to easily convert any format video to WebM for html5 video. It is a WebM Converter which converts almost all video formats including 3GP, AVI, FLV, iPod, MKV, MOV, MP4, OGG, PSP, RM10, RM20, SWF, WMV, M1V, M2V, AAC, AC3, MP2, MP3, WAV, WMA,VCD, SVCD, DVD, MPG, RMV, RMVB, DV, iPad, iPhone to WebM movie formats. It is a multilingual software, including English, Chinese, German, French, Italian, Japanese and Very user-friendly interface and easy to use.
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WebM Converter - WebM Supports

"Support by Mozilla Firefox,Opera,and Google Chrome was announced at the 2010 Google I/O conference. Internet Explorer 9 will also be able to support WebM files if the VP8 codec is installed locally. Safari on the desktop supports any codec installed in QuickTime,allowing future WebM playback using QuickTime codec components such as Perian.Epiphany also supports WebM through the GStreamer multimedia framework." -- John Smith

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