More complicated files may contain more than one audio stream and they may also contain subtitle streams that may be switched on to overlay text to what is viewed or switched off if not required. The audio and video streams need to be synchronised and the overall media file is referred to as a Container. The combining of these two streams into one file (container) is called multiplexing or muxing for short and the reverse process (demuxing) is also possible, a topic considered in another Guide ( viewtopic.php?f=17&t=10900). In its simplest form an audio/video media file contains the viewable information (video) in one section of the file (the video ‘stream’) and what you hear, the audio, in a second stream.
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