YUV - Revision history

DoesItReallyMatter: Format, grammar

2019-05-06T07:07:39Z

Format, grammar

← Older revision		Revision as of 07:07, 6 May 2019
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	YUV can also be referred to as YCbCr, although the terms mean slightly different things,<span id="note1_backlink"></span><sup><small>[[#note1\|[note 1]]]</small></sup> they tend to be confused and used interchangeably (including in VLC-related venues).		YUV can also be referred to as YCbCr, although the terms mean slightly different things,<span id="note1_backlink"></span><sup><small>[[#note1\|[note 1]]]</small></sup> they tend to be confused and used interchangeably (including in VLC-related venues).

	This page explains the most useful YUV pixel formats in the context of VLC media player. Unless otherwise stated, values for each component is stored in one octet (8 bits).		This page explains the most useful YUV pixel formats in the context of VLC media player. Unless otherwise stated, values for each component are stored in one octet (8 bits).

	== Planar formats ==		== Planar formats ==

	Planar (or sometimes "triplanar") formats use separate matrices for each of the 3 color ~~component~~. In other words, there is one table of luminance pixel values, and two separate tables for the chrominance components. This is segregated representation in memory of pixels is more convenient for video coding.		Planar (or sometimes "triplanar") formats use separate matrices for each of the 3 color components. In other words, there is one table of luminance pixel values, and two separate tables for the chrominance components. This segregated representation in memory of pixels is more convenient for video coding.

	=== <span id="4:2:0"></span> YUV 4:2:0 (I420/J420/YV12) ===		=== <span id="4:2:0"></span> YUV 4:2:0 (I420/J420/YV12) ===
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	It has the luma "luminance" plane '''''Y''''' first, then the '''''U''''' chroma plane and last the '''''V''''' chroma plane.		It has the luma "luminance" plane '''''Y''''' first, then the '''''U''''' chroma plane and last the '''''V''''' chroma plane.

	The two chroma planes (blue and red projections) are sub-sampled in both the horizontal and vertical dimensions by a factor of 2. That is to say, for a ~~2x2~~ square of pixels, there are 4 Y samples but only 1 U sample and 1 V sample.		The two chroma planes (blue and red projections) are sub-sampled in both the horizontal and vertical dimensions by a factor of 2. That is to say, for a 2×2 square of pixels, there are 4 Y samples but only 1 U sample and 1 V sample.

	This format requires ~~4*8~~+8+8=48 bits ~~for~~ 4 pixels, so its depth is 12 bits per pixel.		This format requires 4×8+8+8=48 bits per 4 pixels, so its depth is 12 bits per pixel.

	'''I420 is by far the most common format in VLC.''' Most video decoders output raw pictures in I420 format.		'''I420 is by far the most common format in VLC.''' Most video decoders output raw pictures in I420 format.
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	Each letter represents one bit.		Each letter represents one bit.
	* For a single I420 pixel: {{font colour\|blue\|YYYYYYYY}} {{font colour\|green\|UU}} {{font colour\|red\|VV}}		* For a single I420 pixel: {{font colour\|blue\|YYYYYYYY}} {{font colour\|green\|UU}} {{font colour\|red\|VV}}
	* For a 50-pixel I420 frame: ~~YYYYYYYY50 UU50 VV50~~ (or ~~Y850 U250 V2*50~~ for short)		* For a 50-pixel I420 frame: YYYYYYYY×50 UU×50 VV×50 (or Y×8×50 U×2×50 V×2×50 for short)
	* For an ''n''-pixel I420 frame: Y8n U2n V2n		* For an <var>n</var>-pixel I420 frame: Y×8×<var>n</var> U×2×<var>n</var> V×2×<var>n</var>

	==== J420 ====		==== J420 ====
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	However, in I422, chroma planes (blue and red projections) are sub-sampled only in the horizontal dimension, still by a factor of 2. Thus, there is the same amount of lines in chroma planes as in the luma plane.		However, in I422, chroma planes (blue and red projections) are sub-sampled only in the horizontal dimension, still by a factor of 2. Thus, there is the same amount of lines in chroma planes as in the luma plane.

	For a ~~2x2~~ group of pixels, there are 4 Y samples and 2 U and 2 V samples each. The depth is ~~48~~+~~28~~+~~2*8~~ = 64 bits per 4 pixels, so 16 bits per pixel.		For a 2×2 group of pixels, there are 4 Y samples and 2 U and 2 V samples each. The depth is 4×8+2×8+2×8=64 bits per 4 pixels, so 16 bits per pixel.

	Some video codecs support I422 (optionally) for higher quality video encoding.		Some video codecs support I422 (optionally) for higher quality video encoding.
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	=== <span id="4:4:4"></span> YUV 4:4:4 ===		=== <span id="4:4:4"></span> YUV 4:4:4 ===
	==== I444 ====		==== I444 ====
	As I420 and I422, I444 has one luma plane '''''Y''''' and 2 chroma planes '''U''' and '''V'''. Chroma planes are not sub-sampled: there are 3 octet values for each pixels. The depth is thus 24 bits per pixel (as with RGB24 or RGB32).		As I420 and I422, I444 has one luma plane '''''Y''''' and 2 chroma planes '''U''' and '''V'''. Chroma planes are not sub-sampled: there are 3 octet values for each pixels. The depth is thus 24 bits per pixel (as with RGB24 or RGB32).

	A few video codecs support I444 optionally.		A few video codecs support I444 optionally.
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	In NV12, chroma planes (blue and red) are subsampled in both the horizontal and vertical dimensions by a factor of 2.		In NV12, chroma planes (blue and red) are subsampled in both the horizontal and vertical dimensions by a factor of 2.

	For a ~~2x2~~ group of pixels, you have 4 Y samples and 1 U and 1 V sample.		For a 2×2 group of pixels, you have 4 Y samples and 1 U and 1 V sample.

	It can be helpful to think of NV12 as I420 with the U and V planes interleaved.		It can be helpful to think of NV12 as I420 with the U and V planes interleaved.
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	* For 1 NV12 pixel: {{font colour\|blue\|YYYYYYYY}} {{font colour\|green\|UVUV}}		* For 1 NV12 pixel: {{font colour\|blue\|YYYYYYYY}} {{font colour\|green\|UVUV}}
	* For a 2-pixel NV12 frame: {{font colour\|blue\|YYYYYYYYYYYYYYYY}} {{font colour\|green\|UVUVUVUV}}		* For a 2-pixel NV12 frame: {{font colour\|blue\|YYYYYYYYYYYYYYYY}} {{font colour\|green\|UVUVUVUV}}
	* For a 50-pixel NV12 frame: ~~Y850~~ (UV)250		* For a 50-pixel NV12 frame: Y×8×50 (UV)×2×50
	* For a ''n''-pixel NV12 frame: Y8n (UV)~~2~~n		* For a <var>n</var>-pixel NV12 frame: Y×8×<var>n</var> (UV)×2×<var>n</var>

	==== NV21 ====		==== NV21 ====
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	* <span id="note1"></span><sup>[[#note1_backlink\|^ note 1]]</sup> Technical details are generally understood from context. Everything described on this page is Y′CbCr, not Y′UV.<br /><!--		* <span id="note1"></span><sup>[[#note1_backlink\|^ note 1]]</sup> Technical details are generally understood from context. Everything described on this page is Y′CbCr, not Y′UV.<br /><!--
	-->Y′CbCr [[wikipedia:chroma subsampling\|chroma subsampling]] formats (e.g. 4:2:0) are used only for digital signals; VLC deals with digital signals.<br /><!--		-->Y′CbCr [[wikipedia:chroma subsampling\|chroma subsampling]] formats (e.g. 4:2:0) are used only for digital signals; VLC deals with digital signals.<br /><!--
	-->In many cases: Y′UV is for analog signals, Y′PbPr for analog signals in video component cables; Y′CbCr for digital signals (including [[MPEG-2]]). [[wikipedia:Gamma correction\|Gamma correction]] is indicated by a prime <code>′</code>, thus gamma-corrected YCbCr is written <code>Y′CbCr</code>. For an extended discussion see [https://poynton.ca/PDFs/YUV_and_luminance_harmful.pdf YUV and luminance considered harmful] or [https://poynton.ca/notes/colour_and_gamma/ColorFAQ.html#RTFToC26 Color FAQ - What are colour differences?] by Charles Poynton		-->In many cases: Y′UV is for analog signals, Y′PbPr for analog signals in video component cables; Y′CbCr for digital signals (including [[MPEG-2]]). [[wikipedia:Gamma correction\|Gamma correction]] is indicated by a prime <code>′</code>, thus gamma-corrected YCbCr is written <code>Y′CbCr</code>. For an extended discussion see [https://poynton.ca/PDFs/YUV_and_luminance_harmful.pdf YUV and luminance considered harmful] or [https://poynton.ca/notes/colour_and_gamma/ColorFAQ.html#RTFToC26 Color FAQ § What are colour differences?] by Charles Poynton
	</div>		</div>

DoesItReallyMatter: Add footnote explaining usage of terms YUV, Y′UV, YCbCr, Y′CbCr, YPbPr, Y′PbPr. Everything described here is not YUV, but mostly Y′CbCr

2019-05-06T06:48:19Z

Add footnote explaining usage of terms YUV, Y′UV, YCbCr, Y′CbCr, YPbPr, Y′PbPr. Everything described here is not YUV, but mostly Y′CbCr

← Older revision		Revision as of 06:48, 6 May 2019
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	YUV is actually the name of the color space that is common to all "YUV" pixel formats. Contrary to [[RGB]] formats (Red-Green-Blue), YUV colors are represented with one "luminance" component called Y (equivalent to grey scale) and two "chrominance" components, called U (blue projection) and V (red projection) respectively, hence the name.		YUV is actually the name of the color space that is common to all "YUV" pixel formats. Contrary to [[RGB]] formats (Red-Green-Blue), YUV colors are represented with one "luminance" component called Y (equivalent to grey scale) and two "chrominance" components, called U (blue projection) and V (red projection) respectively, hence the name.

	YUV can also be referred to as YCbCr, although the terms mean slightly different things, they tend to be confused and used interchangeably (including in VLC-related venues).		YUV can also be referred to as YCbCr, although the terms mean slightly different things,<span id="note1_backlink"></span><sup><small>[[#note1\|[note 1]]]</small></sup> they tend to be confused and used interchangeably (including in VLC-related venues).

	This page explains the most useful YUV pixel formats in the context of VLC media player. Unless otherwise stated, values for each component is stored in one octet (8 bits).		This page explains the most useful YUV pixel formats in the context of VLC media player. Unless otherwise stated, values for each component is stored in one octet (8 bits).
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	Following the same pattern as NV12/NV21, there are NV16/NV61 (4:2:2 sub-sampling) and NV24/NV42 (4:4:4 sampling) formats. They are mostly used in some funky cheap camera circuitry and not supported in VLC (as of VLC version 2.0).		Following the same pattern as NV12/NV21, there are NV16/NV61 (4:2:2 sub-sampling) and NV24/NV42 (4:4:4 sampling) formats. They are mostly used in some funky cheap camera circuitry and not supported in VLC (as of VLC version 2.0).

			== Notes ==
			<div class="plainlist">
			* <span id="note1"></span><sup>[[#note1_backlink\|^ note 1]]</sup> Technical details are generally understood from context. Everything described on this page is Y′CbCr, not Y′UV.<br /><!--
			-->Y′CbCr [[wikipedia:chroma subsampling\|chroma subsampling]] formats (e.g. 4:2:0) are used only for digital signals; VLC deals with digital signals.<br /><!--
			-->In many cases: Y′UV is for analog signals, Y′PbPr for analog signals in video component cables; Y′CbCr for digital signals (including [[MPEG-2]]). [[wikipedia:Gamma correction\|Gamma correction]] is indicated by a prime <code>′</code>, thus gamma-corrected YCbCr is written <code>Y′CbCr</code>. For an extended discussion see [https://poynton.ca/PDFs/YUV_and_luminance_harmful.pdf YUV and luminance considered harmful] or [https://poynton.ca/notes/colour_and_gamma/ColorFAQ.html#RTFToC26 Color FAQ - What are colour differences?] by Charles Poynton
			</div>

	== Further reading ==		== Further reading ==

DoesItReallyMatter: Add wikilink to RGB

2019-05-06T05:24:39Z

Add wikilink to RGB

← Older revision		Revision as of 05:24, 6 May 2019
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	YUV is a class of pixel formats used in video applications, including {{VLC}}.		YUV is a class of pixel formats used in video applications, including {{VLC}}.

	YUV is actually the name of the color space that is common to all "YUV" pixel formats. Contrary to RGB formats (Red-Green-Blue), YUV colors are represented with one "luminance" component called Y (equivalent to grey scale) and two "chrominance" components, called U (blue projection) and V (red projection) respectively, hence the name.		YUV is actually the name of the color space that is common to all "YUV" pixel formats. Contrary to [[RGB]] formats (Red-Green-Blue), YUV colors are represented with one "luminance" component called Y (equivalent to grey scale) and two "chrominance" components, called U (blue projection) and V (red projection) respectively, hence the name.

	YUV can also be referred to as YCbCr, although the terms mean slightly different things, they tend to be confused and used interchangeably (including in VLC-related venues).		YUV can also be referred to as YCbCr, although the terms mean slightly different things, they tend to be confused and used interchangeably (including in VLC-related venues).

DoesItReallyMatter: Set page anchors: #4:2:0, #4:2:2, #4:4:4

2019-03-31T06:44:41Z

Set page anchors: #4:2:0, #4:2:2, #4:4:4

← Older revision		Revision as of 06:44, 31 March 2019
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	Planar (or sometimes "triplanar") formats use separate matrices for each of the 3 color component. In other words, there is one table of luminance pixel values, and two separate tables for the chrominance components. This is segregated representation in memory of pixels is more convenient for video coding.		Planar (or sometimes "triplanar") formats use separate matrices for each of the 3 color component. In other words, there is one table of luminance pixel values, and two separate tables for the chrominance components. This is segregated representation in memory of pixels is more convenient for video coding.

	=== YUV 4:2:0 (I420/J420/YV12) ===		=== <span id="4:2:0"></span> YUV 4:2:0 (I420/J420/YV12) ===

	==== I420 ====		==== I420 ====
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	YV12 is exactly like I420, but the order of the '''U''' and '''V''' planes is reversed. In the name, "YV" refers to the plane order: Y, then V (then U). "12" refers to the pixel depth: 12-bits per pixel as for I420.		YV12 is exactly like I420, but the order of the '''U''' and '''V''' planes is reversed. In the name, "YV" refers to the plane order: Y, then V (then U). "12" refers to the pixel depth: 12-bits per pixel as for I420.

	=== YUV 4:2:2 (I422/J422) ===		=== <span id="4:2:2"></span> YUV 4:2:2 (I422/J422) ===
	==== I422 ====		==== I422 ====
	Like I420, I422 has one luma plane '''''Y''''' and 2 chroma planes '''U''', '''V'''.		Like I420, I422 has one luma plane '''''Y''''' and 2 chroma planes '''U''', '''V'''.
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	J422 is exactly like I422, but with a full range ("digital", 0-255) luma ('''''Y''''') component instead of limited range ("analog", 16-240). The chroma planes are exactly the same as in I422.		J422 is exactly like I422, but with a full range ("digital", 0-255) luma ('''''Y''''') component instead of limited range ("analog", 16-240). The chroma planes are exactly the same as in I422.

	=== YUV 4:4:4 ===		=== <span id="4:4:4"></span> YUV 4:4:4 ===
	==== I444 ====		==== I444 ====
	As I420 and I422, I444 has one luma plane '''''Y''''' and 2 chroma planes '''U''' and '''V'''. Chroma planes are not sub-sampled: there are 3 octet values for each pixels. The depth is thus 24 bits per pixel (as with RGB24 or RGB32).		As I420 and I422, I444 has one luma plane '''''Y''''' and 2 chroma planes '''U''' and '''V'''. Chroma planes are not sub-sampled: there are 3 octet values for each pixels. The depth is thus 24 bits per pixel (as with RGB24 or RGB32).

DoesItReallyMatter: See also: Creative YUV

2019-03-03T09:19:07Z

DoesItReallyMatter: See also: Huffyuv

2019-02-20T09:08:54Z

DoesItReallyMatter: nn

2019-02-20T09:00:57Z

← Older revision		Revision as of 09:00, 20 February 2019
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	YUV can also be referred to as YCbCr, although the terms mean slightly different things, they tend to be confused and used interchangeably (including in VLC-related venues).		YUV can also be referred to as YCbCr, although the terms mean slightly different things, they tend to be confused and used interchangeably (including in VLC-related venues).

	This page explains the most useful YUV pixel formats in the context of {{VLC}}. Unless otherwise stated, values for each component is stored in one octet (8 bits).		This page explains the most useful YUV pixel formats in the context of VLC media player. Unless otherwise stated, values for each component is stored in one octet (8 bits).

	== Planar formats ==		== Planar formats ==
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	Packed formats are very popular inside ''webcams''. In hardware, using separate planes is inefficient: several memory accesses are needed for each pixel. Packed formats are easier and thus cheaper to use.		Packed formats are very popular inside ''webcams''. In hardware, using separate planes is inefficient: several memory accesses are needed for each pixel. Packed formats are easier and thus cheaper to use.

	On the other hand, packet formats cannot normally deal with vertical sub-sampling. Otherwise scan lines would have different sizes. So generally, packed formats are horizontally subsampled, especially by a factor of 2 (i.e. YUV 4:2:2).		On the other hand, packet formats cannot normally deal with vertical sub-sampling. Otherwise scan lines would have different sizes. So generally, packed formats are horizontally subsampled, especially by a factor of 2 (i.e., YUV 4:2:2).

	=== UYVY ===		=== UYVY ===

DoesItReallyMatter: New section /* Further reading */ with link to https://fourcc.org/yuv.php; move Wikipedia link to template box

2019-02-20T08:56:30Z

New section Further reading: with link to https://fourcc.org/yuv.php; move Wikipedia link to template box

← Older revision		Revision as of 08:56, 20 February 2019
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	~~[http://en.wikipedia.org/wiki/~~YUV YUV] is a class of pixel formats used in video applications, including {{VLC}}.		{{Wikipedia\|YUV}}
			YUV is a class of pixel formats used in video applications, including {{VLC}}.

	YUV is actually the name of the color space that is common to all "YUV" pixel formats. Contrary to RGB formats (Red-Green-Blue), YUV colors are represented with one "luminance" component called Y (equivalent to grey scale) and two "chrominance" components, called U (blue projection) and V (red projection) respectively, hence the name.		YUV is actually the name of the color space that is common to all "YUV" pixel formats. Contrary to RGB formats (Red-Green-Blue), YUV colors are represented with one "luminance" component called Y (equivalent to grey scale) and two "chrominance" components, called U (blue projection) and V (red projection) respectively, hence the name.
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	Following the same pattern as NV12/NV21, there are NV16/NV61 (4:2:2 sub-sampling) and NV24/NV42 (4:4:4 sampling) formats. They are mostly used in some funky cheap camera circuitry and not supported in VLC (as of VLC version 2.0).		Following the same pattern as NV12/NV21, there are NV16/NV61 (4:2:2 sub-sampling) and NV24/NV42 (4:4:4 sampling) formats. They are mostly used in some funky cheap camera circuitry and not supported in VLC (as of VLC version 2.0).

			== Further reading ==
			* https://fourcc.org/yuv.php

	{{documentation}}		{{documentation}}

DoesItReallyMatter: Demote headings, remove stray line break

2019-02-20T08:53:00Z

Demote headings, remove stray line break

← Older revision		Revision as of 08:53, 20 February 2019
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	[http://en.wikipedia.org/wiki/YUV YUV] is a class of pixel formats used in video applications, including {{VLC}}.		[http://en.wikipedia.org/wiki/YUV YUV] is a class of pixel formats used in video applications, including {{VLC}}.

	YUV is actually the name of the color space that is common to all "YUV" pixel formats. Contrary to RGB formats (Red-Green-Blue), YUV colors are represented with one "luminance" component called Y (equivalent to grey scale) and two "chrominance" components,		YUV is actually the name of the color space that is common to all "YUV" pixel formats. Contrary to RGB formats (Red-Green-Blue), YUV colors are represented with one "luminance" component called Y (equivalent to grey scale) and two "chrominance" components, called U (blue projection) and V (red projection) respectively, hence the name.
	called U (blue projection) and V (red projection) respectively, hence the name.

	YUV can also be referred to as YCbCr, although the terms mean slightly different things, they tend to be confused and used interchangeably (including in VLC-related venues).		YUV can also be referred to as YCbCr, although the terms mean slightly different things, they tend to be confused and used interchangeably (including in VLC-related venues).
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	This page explains the most useful YUV pixel formats in the context of {{VLC}}. Unless otherwise stated, values for each component is stored in one octet (8 bits).		This page explains the most useful YUV pixel formats in the context of {{VLC}}. Unless otherwise stated, values for each component is stored in one octet (8 bits).

	= Planar formats =		== Planar formats ==

	Planar (or sometimes "triplanar") formats use separate matrices for each of the 3 color component. In other words, there is one table of luminance pixel values, and two separate tables for the chrominance components. This is segregated representation in memory of pixels is more convenient for video coding.		Planar (or sometimes "triplanar") formats use separate matrices for each of the 3 color component. In other words, there is one table of luminance pixel values, and two separate tables for the chrominance components. This is segregated representation in memory of pixels is more convenient for video coding.

	== YUV 4:2:0 (I420/J420/YV12)==		=== YUV 4:2:0 (I420/J420/YV12) ===

	=== I420 ===		==== I420 ====
	It has the luma "luminance" plane '''''Y''''' first, then the '''''U''''' chroma plane and last the '''''V''''' chroma plane.		It has the luma "luminance" plane '''''Y''''' first, then the '''''U''''' chroma plane and last the '''''V''''' chroma plane.

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	* For an ''n''-pixel I420 frame: Y8n U2n V2n		* For an ''n''-pixel I420 frame: Y8n U2n V2n

	=== J420 ===		==== J420 ====
	J420 is exactly like I420, but with a full range ("digital", 0-255) luma ('''''Y''''') component instead of limited range ("analog", 16-240). The chroma planes are exactly the same as in I420.		J420 is exactly like I420, but with a full range ("digital", 0-255) luma ('''''Y''''') component instead of limited range ("analog", 16-240). The chroma planes are exactly the same as in I420.

	=== YV12 ===		==== YV12 ====
	YV12 is exactly like I420, but the order of the '''U''' and '''V''' planes is reversed. In the name, "YV" refers to the plane order: Y, then V (then U). "12" refers to the pixel depth: 12-bits per pixel as for I420.		YV12 is exactly like I420, but the order of the '''U''' and '''V''' planes is reversed. In the name, "YV" refers to the plane order: Y, then V (then U). "12" refers to the pixel depth: 12-bits per pixel as for I420.

	== YUV 4:2:2 (I422/J422) ==		=== YUV 4:2:2 (I422/J422) ===
	=== I422 ===		==== I422 ====
	Like I420, I422 has one luma plane '''''Y''''' and 2 chroma planes '''U''', '''V'''.		Like I420, I422 has one luma plane '''''Y''''' and 2 chroma planes '''U''', '''V'''.

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	Some video codecs support I422 (optionally) for higher quality video encoding.		Some video codecs support I422 (optionally) for higher quality video encoding.

	=== J422 ===		==== J422 ====
	J422 is exactly like I422, but with a full range ("digital", 0-255) luma ('''''Y''''') component instead of limited range ("analog", 16-240). The chroma planes are exactly the same as in I422.		J422 is exactly like I422, but with a full range ("digital", 0-255) luma ('''''Y''''') component instead of limited range ("analog", 16-240). The chroma planes are exactly the same as in I422.

	== YUV 4:4:4 ==		=== YUV 4:4:4 ===
	=== I444 ===		==== I444 ====
	As I420 and I422, I444 has one luma plane '''''Y''''' and 2 chroma planes '''U''' and '''V'''. Chroma planes are not sub-sampled: there are 3 octet values for each pixels. The depth is thus 24 bits per pixel (as with RGB24 or RGB32).		As I420 and I422, I444 has one luma plane '''''Y''''' and 2 chroma planes '''U''' and '''V'''. Chroma planes are not sub-sampled: there are 3 octet values for each pixels. The depth is thus 24 bits per pixel (as with RGB24 or RGB32).

	A few video codecs support I444 optionally.		A few video codecs support I444 optionally.

	= Packed formats =		== Packed formats ==
	In packed formats, you usually have only one plane, with all the luma and chroma data interleaved. This is similar to RGB pixel formats, only using a different color space.		In packed formats, you usually have only one plane, with all the luma and chroma data interleaved. This is similar to RGB pixel formats, only using a different color space.

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	On the other hand, packet formats cannot normally deal with vertical sub-sampling. Otherwise scan lines would have different sizes. So generally, packed formats are horizontally subsampled, especially by a factor of 2 (i.e. YUV 4:2:2).		On the other hand, packet formats cannot normally deal with vertical sub-sampling. Otherwise scan lines would have different sizes. So generally, packed formats are horizontally subsampled, especially by a factor of 2 (i.e. YUV 4:2:2).

	== UYVY ==		=== UYVY ===
	Known as ''UYVY'', ''Y422'' or ''UYNV''.		Known as ''UYVY'', ''Y422'' or ''UYNV''.

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	In UYVY, the succession for 2 pixels, starts by '''U''' then one luma if the first pixel, then '''V''' and then another luma for the second pixel.		In UYVY, the succession for 2 pixels, starts by '''U''' then one luma if the first pixel, then '''V''' and then another luma for the second pixel.

	== YUY2 ==		=== YUY2 ===
	Known as ''YUY2'', ''YUYV'', ''V422'' or ''YUNV''.		Known as ''YUY2'', ''YUYV'', ''V422'' or ''YUNV''.

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	Conversion between YUY2 and UYVY is achieved by swapping bytes pairwise.		Conversion between YUY2 and UYVY is achieved by swapping bytes pairwise.

	== YVYU ==		=== YVYU ===
	YVYU is just like YUY2, but with '''U''' and '''V''' order reversed.		YVYU is just like YUY2, but with '''U''' and '''V''' order reversed.

	== VYUV ==		=== VYUV ===
	TBD.		TBD.

	= Semi-planar =		== Semi-planar ==

	Semi planar formats have two planes instead of three, one plane for luminance, and one plane for both chrominance components. They are also sometimes referred to as biplanar formats also.		Semi planar formats have two planes instead of three, one plane for luminance, and one plane for both chrominance components. They are also sometimes referred to as biplanar formats also.

	== NV12/NV21 ==		=== NV12/NV21 ===

	=== NV12 ===		==== NV12 ====
	Related to I420, NV12 has one luma "luminance" plane '''''Y''''' and one plane with '''''U''''' and '''''V''''' values interleaved.		Related to I420, NV12 has one luma "luminance" plane '''''Y''''' and one plane with '''''U''''' and '''''V''''' values interleaved.

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	* For a ''n''-pixel NV12 frame: Y8n (UV)2n		* For a ''n''-pixel NV12 frame: Y8n (UV)2n

	=== NV21 ===		==== NV21 ====

	NV21 is like [[NV12]], but with '''U''' and '''V''' order reversed: it starts with '''V'''.		NV21 is like [[NV12]], but with '''U''' and '''V''' order reversed: it starts with '''V'''.

	== Other NV formats ==		=== Other NV formats ===

	Following the same pattern as NV12/NV21, there are NV16/NV61 (4:2:2 sub-sampling) and NV24/NV42 (4:4:4 sampling) formats. They are mostly used in some funky cheap camera circuitry and not supported in VLC (as of VLC version 2.0).		Following the same pattern as NV12/NV21, there are NV16/NV61 (4:2:2 sub-sampling) and NV24/NV42 (4:4:4 sampling) formats. They are mostly used in some funky cheap camera circuitry and not supported in VLC (as of VLC version 2.0).

	{{documentation}}		{{documentation}}

Edwardw: /* NV12 */

2012-12-28T20:32:30Z

NV12

← Older revision		Revision as of 20:32, 28 December 2012
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	* For 1 NV12 pixel: {{font colour\|blue\|YYYYYYYY}} {{font colour\|green\|UVUV}}		* For 1 NV12 pixel: {{font colour\|blue\|YYYYYYYY}} {{font colour\|green\|UVUV}}
	* For a 2-pixel NV12 frame: {{font colour\|blue\|YYYYYYYYYYYYYYYY}} {{font colour\|green\|UVUVUVUV}}		* For a 2-pixel NV12 frame: {{font colour\|blue\|YYYYYYYYYYYYYYYY}} {{font colour\|green\|UVUVUVUV}}
	* For a 50-pixel NV12 frame: Y850 (UV)*50		* For a 50-pixel NV12 frame: Y850 (UV)250
	* For a ''n''-pixel NV12 frame: Y8n (UV)*n		* For a ''n''-pixel NV12 frame: Y8n (UV)2n

	=== NV21 ===		=== NV21 ===

← Older revision		Revision as of 20:32, 28 December 2012
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	* For 1 NV12 pixel: {{font colour\|blue\|YYYYYYYY}} {{font colour\|green\|UVUV}}		* For 1 NV12 pixel: {{font colour\|blue\|YYYYYYYY}} {{font colour\|green\|UVUV}}
	* For a 2-pixel NV12 frame: {{font colour\|blue\|YYYYYYYYYYYYYYYY}} {{font colour\|green\|UVUVUVUV}}		* For a 2-pixel NV12 frame: {{font colour\|blue\|YYYYYYYYYYYYYYYY}} {{font colour\|green\|UVUVUVUV}}
	* For a 50-pixel NV12 frame: Y850 (UV)*50		* For a 50-pixel NV12 frame: Y850 (UV)250
	* For a ''n''-pixel NV12 frame: Y8n (UV)*n		* For a ''n''-pixel NV12 frame: Y8n (UV)2n

	=== NV21 ===		=== NV21 ===

← Older revision		Revision as of 09:19, 3 March 2019
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	{{See also\|Huffyuv}}		{{See also\|Huffyuv\|Creative YUV}}
	{{Wikipedia\|YUV}}		{{Wikipedia\|YUV}}
	YUV is a class of pixel formats used in video applications, including {{VLC}}.		YUV is a class of pixel formats used in video applications, including {{VLC}}.

← Older revision		Revision as of 09:08, 20 February 2019
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			{{See also\|Huffyuv}}
	{{Wikipedia\|YUV}}		{{Wikipedia\|YUV}}
	YUV is a class of pixel formats used in video applications, including {{VLC}}.		YUV is a class of pixel formats used in video applications, including {{VLC}}.