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They may recompress the video to another format in a process called transcoding, or may simply change the container format without changing the video format. The disadvantages of transcoding are that there is quality loss when transcoding between lossy compression formats, and that the process is highly CPU -intensive.
YouTube originally offered videos at only one quality level, displayed at a resolution of 320×240 pixels using the Sorenson Spark codec (a variant of H.263), [29] [30] with mono MP3 audio. [31] In June 2007, YouTube added an option to watch videos in 3GP format on mobile phones. [32]
Some are combinations of common container formats and audio and video coding profiles, such as AVCHD and DivX formats. Although sometimes compared to DivX products, Xvid is neither a container format nor a video format, it is a software library that encodes video using specific coding profiles of the common MPEG-4 ASP video format. Those types ...
The MP4 file format defined some extensions over the ISO Base Media File Format to support MPEG-4 visual/audio codecs and various MPEG-4 Systems features such as object descriptors and scene descriptions. Some of these extensions are also used by other formats based on the ISO base media file format (e.g., 3GP). [1]
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.
MediaHuman Audio Converter is a freeware audio conversion utility developed by MediaHuman Ltd. The program is used to convert across different audio formats, [1] split lossless audio files using CUE and extract audio from video files. The app can be run on Mac [2] starting from OS X 10.6 and on Windows XP and higher. [3]
All services support the following input file formats: Moving Picture Experts Group (.MPG/MPEG-1) QuickTime File Format (.MOV) Windows Media Video (.WMV) Audio Video Interleave (.AVI) H.264 MPEG-4/AVC (.MP4) Unless otherwise indicated, they also support the following input file formats: Matroska Multimedia Container (.MKV) Theora (.OGV)