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VoiceOver is a screen reader built into Apple Inc.'s macOS, iOS, tvOS, watchOS, and iPod operating systems. By using VoiceOver, the user can access their Macintosh or iOS device based on spoken descriptions and, in the case of the Mac, the keyboard.
A standardized (or in some cases de facto standard) video file type such as .webm is a profile specified by a restriction on which container format and which video and audio compression formats are allowed. The coded video and audio inside a video file container (i.e. not headers, footers, and metadata) is called the essence.
LLVC (Low Latency Video Codec; SMPTE RDD 34) - used in Networked Media Interface (NMI; SMPTE RDD 40) HEVC-SCC (Screen Content Coding Extensions) ZRLE (RFC 6143 7.7.6) - used by VNC; Sun Microsystems's CellB video (RTP playload type 25) - used in Solaris's SunVideo Plus [79] and Lawrence Berkeley National Laboratory's vic (Video Conferencing ...
While the only filename extension defined by the standard is .mp4, various filename extensions are commonly used to indicate intended content: MPEG-4 files with audio and video generally use the standard .mp4 extension. Audio-only MPEG-4 files generally have a .m4a extension. This is especially true of unprotected content.
It offers the opportunity to create and edit videos with a vast variety of video and audio effects, text and transitions; [3] capture video from screen, web or DV cameras and VHS tape; record voice; [4] create menus for discs, as well as to save them to plenty of video file formats, burn to discs or publish on Facebook, YouTube, Flickr, etc. [5]
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Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.