This is an advanced tool that only a few technically minded people will have use for, but is nonetheless very powerful when put to use.
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A stream demultiplexer is a tool that will take a recorded file with potentially several video and audio streams and separate them out into their own files.
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Normally, a recording will have only one video stream and one audio stream, but there can be an unlimited number (eg in a Transport Stream recording - see <a href="../settings/Recordings - General.htm#9"> Recording an entire Transport Stream</a>).
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Where a single programme has been recorded, the tool will show the identification numbers of each stream that was found. In the example screen-shot below, a single video stream was found with an ID of 0xe0 and a single MPEG1 audio stream
was found with an ID of 0xc0.
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<img src='../../images/ToolDemux.gif'></td>
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In the case shown, if you were to demultiplex this file you would end up with two files - one with just the video in, and one with just the audio. The files would be given the same name as your original recording, but would be suffixed
with the stream ID number that they contain (in this case <i>Sunrise (0xe0).m2v</i> and <i>Sunrise (0xc0).mp2</i>).
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If you use a complete Transport Stream recording as your input file, then the tool has a little more information with which to present you. It will be able to determine not only which audio and video streams exist in the file, but rather than just
give meaningless IDs for each, it is able to tell you the channel name that the stream belongs to:
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<img src='../../images/ToolTS.gif'></td>
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This feature is particularly useful when trying to extract the streams for a single programme from a recording that may contain up to eight individual programmes at a time.
