Porcuswiki: DTS-HD wasn't precisely described. And with the explanation, the last bullet item looked like the penultimate.

2024-05-18T17:52:01Z

DTS-HD wasn't precisely described. And with the explanation, the last bullet item looked like the penultimate.

← Older revision		Revision as of 17:52, 18 May 2024
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	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.		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.

	Hybrid encoding can have a variety of purposes, at least including the following:		Hybrid encoding can have a variety of purposes and methods, at least including the following:
	* 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.		* 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.
	* 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~~.		* 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 the newer [[DTS-HD]] formats provide not only a "core" DTS stream to legacy players, but also an "extension"/correction streams that the "HD"-aware players can use for more audio information. In the "DTS-HD-MA" version, the extension stream (together with the core DTS stream) will provide for losslessness. The rarer [http://wiki.hydrogenaud.io/index.php?title=Lossless_comparison#MPEG-4_SLS MPEG-4 SLS] format has an [[AAC]] core stream and a correction stream for losslessness.
	* 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.		* Other ways to retro-fit losslessness into a lossy format without breaking compatibility, include to store the correction not as a stream, but in the same way as a tag chunk. [[ATRAC]]'s lossless mode and the short-lived [[Mp3HD]] were such retro-fits. An Mp3 player would then treat this chunk as if it were an unknown tag, ignoring it.

	{{navbox audio codecs}}		{{navbox audio codecs}}

Porcuswiki: 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

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..."

New page

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.

Hybrid encoding can have a variety of purposes, at least including the following:
* 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.
* 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.
* 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.

{{navbox audio codecs}}

Hybrid codec - Revision history

Porcuswiki: DTS-HD wasn't precisely described. And with the explanation, the last bullet item looked like the penultimate.

Porcuswiki: 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..."