https://wiki.hydrogenaud.io/index.php?title=Hybrid_codec&feed=atom&action=historyHybrid codec - Revision history2024-03-28T21:07:34ZRevision history for this page on the wikiMediaWiki 1.22.7https://wiki.hydrogenaud.io/index.php?title=Hybrid_codec&diff=35454&oldid=prevPorcuswiki: Created page with "A lossless/lossy ''''hybrid'''' codec provides encoding to a lossless and a lossy stream simultaneously within the same format: it stores a lossy audio stream that can..."2022-01-16T19:54:41Z<p>Created page with "A lossless/lossy ''''hybrid'''' codec provides encoding to a <a href="/index.php?title=Lossless" title="Lossless">lossless</a> and a <a href="/index.php?title=Lossy" title="Lossy">lossy</a> stream simultaneously within the same format: it stores a lossy audio stream that can..."</p>
<p><b>New page</b></p><div>A lossless/lossy ''''hybrid'''' codec provides encoding to a [[lossless]] and a [[lossy]] stream simultaneously within the same format: it stores a lossy audio stream that can be played back as such, and then a correction stream such that decoding is lossless when both are present. The correction stream can be in the same file as the lossy stream, or in a separate file.<br />
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Hybrid encoding can have a variety of purposes, at least including the following:<br />
* For end-users to keep lossy versions (say, for portable use) to be copied without the time or computing effort needed to transcode lossy to lossless every time; rather than keeping two sets of files, one can maintain one single copy in one single library, such that e.g. tag updates need only be done once. [[WavPack]] and [[OptimFROG]] provide for this option through their hybrid modes.<br />
* A similar purpose, but where the output stream is automatically selected by a hardware or software application, for example defaulting to a lossy stream if the transmission cannot support the lossless - or possibly for DRM purposes. In Blu-Ray, support for [[DTS]] (also often found in DVDs) is mandatory, and [[DTS-HD]] will serve the DTS stream to players which do not support the lossless stream - or those players will transmit the DTS stream to e.g. AV receivers without DTS-HD support. The rarer [http://wiki.hydrogenaud.io/index.php?title=Lossless_comparison#MPEG-4_SLS MPEG-4 SLS] format has an [[AAC]] core file and a correction file.<br />
* To retro-fit a lossless option into a lossy format without breaking compatibility. This can be done by storing it the same way as a tag chunk, to be ignored by applications that don't support them. [[ATRAC]]'s lossless mode and the short-lived [[Mp3HD]] were such retro-fits.<br />
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