F4V files are variants of the original flash (flv) file format and is effectively a flash renamed MP4 file. It supports H.264 offering which offers much greater compression than previously. The F4V file type is based on the ISO base media file format and supports the Flash player 9 update 3. F4V files cannot be played on iOS Apple devices, however they can be played through most browsers that support Flash.
Flash developers are actively encouraging developers to move towards F4V and away from the older FLV format. There are limitations with the old FLV structure when streaming H.264 or AAC which is now overcome by the F4V file type. As F4V is based on the ISO base media file format which defines a general structure for time based multimedia files such as audio and video. This baseline is used for other container formats such as MP4 and 3GP.
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WMV files are a type of video file (usually containing audio) from Microsoft. These files can be played on a variety of video players on both Mac and PC machines. Some WMV files may have digital rights management (DRM) protection which prevents users from making unauthorized copies of files purchased in online stores.
Windows Media Video (WMV) is a compressed video file format for several proprietary codecs developed by Microsoft. These files are based on the Microsoft Advanced Systems Format (ASF) container format encoded using the Windows Media Video (WMV) codec.
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