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RGB 8bf p Data
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BitJazz
SheerVideo Power
Y'CbCr 8bv 4:2:2p Data

The following table shows the compression statistics for the Sheer Y'CbCr 8bv 4:2:2p codec for each of the Kodak images. When encoding Y'CbCr 8bv 4:2:2p images with the Sheer Y'CbCr 8bv 4:2:2p codec, SheerVideo's compression power ranges from 1.81 in image 13 to 2.82 in image 03, averaging 2.43. The space savings for Sheer Y'CbCr 8bv 4:2:2p ranges from 45% to 65%, averaging around 58%.

uncom-
pressed
Sheer-
Video
# image '2vuy'
'yuvs'
'Shr3'
01786432
1.00
0%
363269
2.16
54%
bytes
power
space savings
02786432
1.00
0%
306949
2.56
61%
bytes
power
space savings
03786432
1.00
0%
279074
2.82
65%
bytes
power
space savings
04786432
1.00
0%
312401
2.52
60%
bytes
power
space savings
05786432
1.00
0%
385755
2.04
51%
bytes
power
space savings
06786432
1.00
0%
341897
2.30
57%
bytes
power
space savings
07786432
1.00
0%
291969
2.69
63%
bytes
power
space savings
08786432
1.00
0%
389398
2.02
50%
bytes
power
space savings
09786432
1.00
0%
293571
2.68
63%
bytes
power
space savings
10786432
1.00
0%
295243
2.66
62%
bytes
power
space savings
11786432
1.00
0%
322116
2.44
59%
bytes
power
space savings
12786432
1.00
0%
284596
2.76
64%
bytes
power
space savings
13786432
1.00
0%
435295
1.81
45%
bytes
power
space savings
14786432
1.00
0%
359854
2.19
54%
bytes
power
space savings
15786432
1.00
0%
304018
2.59
61%
bytes
power
space savings
16786432
1.00
0%
299160
2.63
62%
bytes
power
space savings
17786432
1.00
0%
298710
2.63
62%
bytes
power
space savings
18786432
1.00
0%
376413
2.09
52%
bytes
power
space savings
19786432
1.00
0%
330019
2.38
58%
bytes
power
space savings
20786432
1.00
0%
302715
2.60
62%
bytes
power
space savings
21786432
1.00
0%
337114
2.33
57%
bytes
power
space savings
22786432
1.00
0%
338446
2.32
57%
bytes
power
space savings
23786432
1.00
0%
280119
2.81
64%
bytes
power
space savings
24786432
1.00
0%
353707
2.22
55%
bytes
power
space savings

Mean 786432
1.00
0%
328409
2.43
58%
bytes
power
space savings

The Y'CBCR 8bv 4:2:2 format, found in the pixel format '2vuy', is the most common uncompressed video format today. Y'CBCR 8bv 4:2:2 contains only two 8-bit values per pixel. While luma (Y') is represented at every pixel, each pixel only retains a single chroma value, alternating between CB and CR.
  • Y': luma
  • CB: blue-yellow chroma
  • Y': luma
  • CR: red-cyan chroma

Y'CBCR 8bv 4:2:2, the luma component has a nominal range of 220 unsigned integer values, and both chroma components have nominal ranges of 225 offset binary integer values. The chroma range of [16..240]->[-1/2..1/2] allows some play on both ends for out-of-range colors. Likewise, the luma component's [16..235]->[0..1] range leaves footroom at the bottom for subblack colors as well as headroom at the top for superwhite colors. This format is compliant with the International Telecommunication Union's Recommendation BT.601-4, and is used in standard uncompressed Y'CBCR 4:2:2 digital video tape (SMPTE D-1), standard uncompressed digital video links (SMPTE 259M), and professional video equipment.

At the time we performed these tests, there was no uncompressed Y'CBCR 8bv 4:2:2 QuickTime codec available. So we wrote our own QuickTime codec to translate between yuv2 and 2vuy, using the simple standard equations given in Recommendation ITU-R BT.601-4:

Y' = floor(y' x 219 / 255 + 16.5)
Cb = floor(cb x 224 / 254 + 128.5)
Cr = floor(cr x 224 / 254 + 128.5)
With this codec, we converted the Y'CBCR 8bw 4:2:2 movie to Y'CBCR 8bv 4:2:2 format.

The Sheer Y'CbCr 8bv 4:2:2 encoder was used with the settings: Millions of Colors, Progressive.

With only 2 byte-size components per pixel, the uncompressed size of each these Y'CBCR 8bw 4:2:2 frames is 2 x 768 x 512 = 786432 bytes.


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