What is Divx Quality Index?
"Divx Quality Index"(DivxQI) have two parts; "Divx Encode Index"(DivxEI) & "Divx Screen Index"(DivxSI).

"Divx Encode Index" is a encoding quality reference. It is a ratio between pixels & bytes/frame. More pixels need more bytes/frame to get good quality.

"Divx Screen Index" is movie playback quality  reference; design for DVD-Rip only (source file 720pixels width). Divx creators reduce image size to get a better "Divx Encode Index" but our screen are still 1024x768. The magnification of Windows Media Player play a movie to fit our screen resolution, it also is a key of quality.
"Divx Encode Index"=100 & "Divx Screen Index"=100 : the best, 4x700MB for 120min. Movie
"Divx Encode Index" = 100 & "Divx Screen Index" = 88 : reasonable, good
"Divx Encode Index" = 100 & "Divx Screen Index" = 71 : average to below

Please check "Divx Encode Index" before encoding. If "DivxEI" is 40 or less, you would reduce image size or increase bitrate to get a better result.

Find bytes/frame?
There have 3 methods, you can use either one.

SBC-Divx Quality?
SBC-Divx Quality work with SBC-311 only. It would search all frames to take the average of encoding quality. The design concept is  perfect, but it almost show a wrong figures.
There have a example: Mulholland Drive >> SBC-Divx Quality = 92, DivxEI = 42 & my eyes said bad.
Mulholland Drive 95% images are brightness & low motion, 5% are darkness & fast. 311-Low Motion code is the best for brightness & low motion, but there have a lot of marco-block & noise under darkness & fast motion. Then the average encoding result is 95%(good):5%(bad); it will show 92.
SBC-Divx Quality skip the worst in this case but our eyes never skip anything.

DivX DRF Analyzer?
DivX DRF Analyzer is detail & powerful tool for your existent AVI files and also a important tool for Divx Code Development. But it would do nothing  before encoding.

DivX DRF Analyzer Report!
File Name: D:\Movie\Monsters.Ball.DVD.Screener.avi
Resolution: [ Width: 512 Height: 224 ]
Frame Rate: 23.976 frames per second
The Video has 154310 frames [ 01:47:16 ]
Average Frame quality is HIGH
Standard Deviation: Quality is MEDIUM
Image Resolution is MEDIUM
There are NO frame drops ( NO drops is better )
This video may have some frames with VERY POOR Quality
Performance Caracteristics:
This video seems to have too FEW Keyframes. May degrade image quality and seeking.
Macroblocks per frame: 448
The Width is multiple of 32
Kilobits per Second: 731.27
Kilobits per Frame: 30.49
Kilobits per Macroblock: 0.068
Bits per Pixel: 0.27

DivxQI Database

Movie

Frame Size (pixels)

Code Type

File Size

DivxEI

DivxSI

Blask Hawk Down

576 x 240

SBC_311

2 x 700MB

92

74

Delicatessen

576 x 312

SBC_311

1 x 700MB

40

36

Event Horizon

576 x 240

SBC_311

1 x 700MB

41

36

Full Metal Jacket

576 x 416

SBC_311

2 x 700MB

61

49

Harry Potter & The Sorcerers Stone

640 x 272

SBC_311

2 x 700MB

55

48

K-pax

640 x 272

SBC_311

2 x 700MB

85

76

Kill Me Later

576 x 304

SBC_311

1 x 700MB

57

46

Love Story 1970

576 x 320

SBC_311

1 x 700MB

49

39

Monster's Ball (DVD Screener)

512 x 224

SBC_311

1 x 700MB

68

48

Mulholland Drive

640 x 352

SBC_311

2 x 700MB

42

37

Rat Race

640 x 272

SBC_311

2 x 700MB

92

82

Osmosis Jones

576 x 240

SBC_311

1 x 700MB

40

36

Predator

640 x 352

SBC_311

1 x 700MB

38

34

Sleeping Beauty 1959

576 x 432

SBC_311

1 x 700MB

46

37

Zoolander

640 x 272

SBC_311

1 x 700MB

59

53

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