MJPEG Encoder Research, no questions here

Martin Koch · Jun 12, 2010

For pros and testers only!

tester13 said:
Did you tried to contact JPEGSnoop author?
It is actively developed, as I understand.

I don't think it's a JPEGsnoop problem but rather a problem with PapasArts MJPEG file therefore my request for a more normal 720p file.

tester13 said:
You can try to change MJPEG values and see at quantization tables yourself.

Sorry I don't have a GH1.

Here are the quantisation tables of an unaltered GH1 according to JPEGsnoop. The smaller the numbers the lower the compression.
http://www.dvxuser.com/V6/picture.php?albumid=485&pictureid=3413

Martin Koch · Jun 12, 2010

And here's the Pentax K-7 which already has a high bitrate MJPEG codec.

http://www.dvxuser.com/V6/picture.php?albumid=485&pictureid=3414

Vitaliy Kiselev · Jun 12, 2010

Martin Koch said:
And here's the Pentax K-7 which already has a high bitrate MJPEG codec.

Thanks, you can look at GH1 photo tables using different quality settings.
Also look at TZ5 footage, as it seems as all MJPEG and JPEG implementation is identical.
Btw, you can buy used TZ5 on ebay for cheap now, it is very good and versatile camera.

P.S. One tip - do not use attachments - use Member Upload center and insert provided links, so non-members can view your pictures.

Vitaliy Kiselev · Jun 12, 2010

MJPEG Encoder Research, no questions here

Tables:

Code:

High quality
 
  Define a Quantization Table.
  OFFSET: 0x00007602
  Table length = 132
  ----
  Precision=8 bits
  Destination ID=0 (Luminance)
    DQT, Row #0:   1   1   1   1   1   1   2   2 
    DQT, Row #1:   1   1   1   1   1   1   2   2 
    DQT, Row #2:   1   1   1   1   1   1   2   2 
    DQT, Row #3:   1   1   1   1   2   2   3   3 
    DQT, Row #4:   1   1   1   2   2   2   2   3 
    DQT, Row #5:   1   1   2   2   2   3   2   3 
    DQT, Row #6:   1   2   3   2   3   3   3   3 
    DQT, Row #7:   2   2   3   3   3   3   3   3 
    Approx quality factor = 98.01 (scaling=3.98 variance=3.69)
  ----
  Precision=8 bits
  Destination ID=1 (Chrominance)
    DQT, Row #0:   1   1   1   1   3   3   3   3 
    DQT, Row #1:   1   1   1   2   3   3   3   3 
    DQT, Row #2:   1   1   2   3   3   3   3   3 
    DQT, Row #3:   1   3   3   3   3   3   3   3 
    DQT, Row #4:   2   3   3   3   3   3   3   3 
    DQT, Row #5:   3   3   3   3   3   3   3   3 
    DQT, Row #6:   3   3   3   3   3   3   3   3 
    DQT, Row #7:   3   3   3   3   3   3   3   3 
    Approx quality factor = 98.39 (scaling=3.23 variance=0.48)

Lower quality
*** Marker: DQT (xFFDB) ***
  Define a Quantization Table.
  OFFSET: 0x00007602
  Table length = 132
  ----
  Precision=8 bits
  Destination ID=0 (Luminance)
    DQT, Row #0:   2   2   2   2   5   4   9   9 
    DQT, Row #1:   2   2   2   2   4   7   9   9 
    DQT, Row #2:   2   2   4   4   4   7  12  11 
    DQT, Row #3:   2   4   4   5   9  11  16  16 
    DQT, Row #4:   2   4   5   9  11  12   9  18 
    DQT, Row #5:   7   5   9  11  12  16  12  16 
    DQT, Row #6:   4  11  14  12  16  18  16  14 
    DQT, Row #7:  11  12  14  14  18  18  16  16 
    Approx quality factor = 92.07 (scaling=15.85 variance=15.32)
  ----
  Precision=8 bits
  Destination ID=1 (Chrominance)
    DQT, Row #0:   4   2   4   4  16  16  16  16 
    DQT, Row #1:   4   4   7   9  16  16  16  16 
    DQT, Row #2:   4   7  11  16  16  16  16  16 
    DQT, Row #3:   4  16  16  16  16  16  16  16 
    DQT, Row #4:  11  16  16  16  16  16  16  16 
    DQT, Row #5:  16  16  16  16  16  16  16  16 
    DQT, Row #6:  16  16  16  16  16  16  16  16 
    DQT, Row #7:  16  16  16  16  16  16  16  16 
    Approx quality factor = 91.74 (scaling=16.51 variance=8.99)

1280 preview
 Precision=8 bits
  Destination ID=0 (Luminance)
    DQT, Row #0:   4   4   4   4  12   8  19  19 
    DQT, Row #1:   4   4   4   4   8  16  19  19 
    DQT, Row #2:   4   4   8   8   8  16  27  23 
    DQT, Row #3:   4   8   8  12  19  23  35  35 
    DQT, Row #4:   4   8  12  19  23  27  19  39 
    DQT, Row #5:  16  12  19  23  27  35  27  35 
    DQT, Row #6:   8  23  31  27  35  39  35  31 
    DQT, Row #7:  23  27  31  31  39  39  35  35 
    Approx quality factor = 83.09 (scaling=33.82 variance=75.87)
  ----
  Precision=8 bits
  Destination ID=1 (Chrominance)
    DQT, Row #0:   8   4   8   8  35  35  35  35 
    DQT, Row #1:   8   8  16  19  35  35  35  35 
    DQT, Row #2:   8  16  23  35  35  35  35  35 
    DQT, Row #3:   8  35  35  35  35  35  35  35 
    DQT, Row #4:  23  35  35  35  35  35  35  35 
    DQT, Row #5:  35  35  35  35  35  35  35  35 
    DQT, Row #6:  35  35  35  35  35  35  35  35 
    DQT, Row #7:  35  35  35  35  35  35  35  35 
    Approx quality factor = 82.11 (scaling=35.77 variance=46.49)

848 preview
 Precision=8 bits
  Destination ID=0 (Luminance)
    DQT, Row #0:   4   4   4   4  12   8  20  20 
    DQT, Row #1:   4   4   4   4   8  16  20  20 
    DQT, Row #2:   4   4   8   8   8  16  28  24 
    DQT, Row #3:   4   8   8  12  20  24  36  36 
    DQT, Row #4:   4   8  12  20  24  28  20  40 
    DQT, Row #5:  16  12  20  24  28  36  28  36 
    DQT, Row #6:   8  24  32  28  36  40  36  32 
    DQT, Row #7:  24  28  32  32  40  40  36  36 
    Approx quality factor = 82.73 (scaling=34.55 variance=78.31)
  ----
  Precision=8 bits
  Destination ID=1 (Chrominance)
    DQT, Row #0:   8   4   8   8  36  36  36  36 
    DQT, Row #1:   8   8  16  20  36  36  36  36 
    DQT, Row #2:   8  16  24  36  36  36  36  36 
    DQT, Row #3:   8  36  36  36  36  36  36  36 
    DQT, Row #4:  24  36  36  36  36  36  36  36 
    DQT, Row #5:  36  36  36  36  36  36  36  36 
    DQT, Row #6:  36  36  36  36  36  36  36  36 
    DQT, Row #7:  36  36  36  36  36  36  36  36 
    Approx quality factor = 81.67 (scaling=36.65 variance=46.37)
 
640 preview
 
*** Marker: DQT (xFFDB) ***
  Define a Quantization Table.
  OFFSET: 0x00007602
  Table length = 132
  ----
  Precision=8 bits
  Destination ID=0 (Luminance)
    DQT, Row #0:   3   3   3   3  10   7  16  16 
    DQT, Row #1:   3   3   3   3   7  13  16  16 
    DQT, Row #2:   3   3   7   7   7  13  23  20 
    DQT, Row #3:   3   7   7  10  16  20  29  29 
    DQT, Row #4:   3   7  10  16  20  23  16  33 
    DQT, Row #5:  13  10  16  20  23  29  23  29 
    DQT, Row #6:   7  20  26  23  29  33  29  26 
    DQT, Row #7:  20  23  26  26  33  33  29  29 
    Approx quality factor = 85.95 (scaling=28.10 variance=56.76)
  ----
  Precision=8 bits
  Destination ID=1 (Chrominance)
    DQT, Row #0:   7   3   7   7  29  29  29  29 
    DQT, Row #1:   7   7  13  16  29  29  29  29 
    DQT, Row #2:   7  13  20  29  29  29  29  29 
    DQT, Row #3:   7  29  29  29  29  29  29  29 
    DQT, Row #4:  20  29  29  29  29  29  29  29 
    DQT, Row #5:  29  29  29  29  29  29  29  29 
    DQT, Row #6:  29  29  29  29  29  29  29  29 
    DQT, Row #7:  29  29  29  29  29  29  29  29 
    Approx quality factor = 85.10 (scaling=29.80 variance=31.70)
 
320 preview 
 
*** Marker: DQT (xFFDB) ***
  Define a Quantization Table.
  OFFSET: 0x00007602
  Table length = 132
  ----
  Precision=8 bits
  Destination ID=0 (Luminance)
    DQT, Row #0:   3   3   3   3  10   7  16  16 
    DQT, Row #1:   3   3   3   3   7  13  16  16 
    DQT, Row #2:   3   3   7   7   7  13  23  20 
    DQT, Row #3:   3   7   7  10  16  20  29  29 
    DQT, Row #4:   3   7  10  16  20  23  16  33 
    DQT, Row #5:  13  10  16  20  23  29  23  29 
    DQT, Row #6:   7  20  26  23  29  33  29  26 
    DQT, Row #7:  20  23  26  26  33  33  29  29 
    Approx quality factor = 85.95 (scaling=28.10 variance=56.76)
  ----
  Precision=8 bits
  Destination ID=1 (Chrominance)
    DQT, Row #0:   7   3   7   7  29  29  29  29 
    DQT, Row #1:   7   7  13  16  29  29  29  29 
    DQT, Row #2:   7  13  20  29  29  29  29  29 
    DQT, Row #3:   7  29  29  29  29  29  29  29 
    DQT, Row #4:  20  29  29  29  29  29  29  29 
    DQT, Row #5:  29  29  29  29  29  29  29  29 
    DQT, Row #6:  29  29  29  29  29  29  29  29 
    DQT, Row #7:  29  29  29  29  29  29  29  29 
    Approx quality factor = 85.10 (scaling=29.80 variance=31.70)

Vitaliy Kiselev · Jun 12, 2010

Here's how MJPEG quality works in GH1:

For each resolution we have following structure:
MJPEG_mode04_1280x720:.
.long 0 !
.word 0x80 ! quality
.word 0x85 ! table index
.long 8 ! some buffer estimator
.word 0x6E
.word 0x92
.long 6 ! <second
.word 0x64
.word 0x96
.long 4 ! <third
.word 0x5C
.word 0x9B
.long 0
.word 0
.word 0

Table index is index within 1024 size table of byte type values.
First part (starting with leading 0 dword) is used to estimate main quality (both quality and table index affect bitrate).
All other parts have lower quality values and are used to dynamically reduce bitrate, as I understand (as we have buffer and upon buffer overflow problems we move to next part).
This is my current understanding.
I believe that all Q tables are implemented in pure hardware.

IanB · Jun 12, 2010

Ok, here is my contribution

Ok, here is my contribution

QUALITY SETTINGS [ 384, 330, 300, 276 ]
TABLE SETTINGS [ 24, 24, 24, 24 ]

No 1080p or anything like that just standard 720p mjpeg 30fps
File is 79.1 mbps according to Quick-time
3.36 pTool set

Original File to come...

I think this is the correct table?

Define a Quantization Table.
OFFSET: 0x00007602
Table length = 132
----
Precision=8 bits
Destination ID=0 (Luminance)
DQT, Row #0: 1 1 1 1 2 1 3 3
DQT, Row #1: 1 1 1 1 1 2 3 3
DQT, Row #2: 1 1 1 1 1 2 4 3
DQT, Row #3: 1 1 1 2 3 3 5 5
DQT, Row #4: 1 1 2 3 3 4 3 6
DQT, Row #5: 2 2 3 3 4 5 4 5
DQT, Row #6: 1 3 5 4 5 6 5 5
DQT, Row #7: 3 4 5 5 6 6 5 5
Approx quality factor = 97.27 (scaling=5.47 variance=2.65)
----
Precision=8 bits
Destination ID=1 (Chrominance)
DQT, Row #0: 1 1 1 1 5 5 5 5
DQT, Row #1: 1 1 2 3 5 5 5 5
DQT, Row #2: 1 2 3 5 5 5 5 5
DQT, Row #3: 1 5 5 5 5 5 5 5
DQT, Row #4: 3 5 5 5 5 5 5 5
DQT, Row #5: 5 5 5 5 5 5 5 5
DQT, Row #6: 5 5 5 5 5 5 5 5
DQT, Row #7: 5 5 5 5 5 5 5 5
Approx quality factor = 97.48 (scaling=5.04 variance=0.70)

GrgurMG · Jun 12, 2010

Camera Settings:

Color: DYN iExposure: off
Mode: Shutter Priority ISO: 100

Patch Settings:

MJPEG Resolution Unpatched (Standard 1080x720)
MJPEG Framerate Unpatched (30fps)

MJPEG Quality: 320>220>200>184
MJPEG Table: 24>24>24>24

No other MJPEG patches applied.

----------------------------------------------------------------

Clip 1)
http://www.jerseyforged.com/sampleclips/MJPEG_Tests/P1000586.JPG

Quicktime Reports Video at: 57.71 mbps

Code:

*** Marker: DQT (xFFDB) ***
Define a Quantization Table.
OFFSET: 0x00007602
Table length = 132
----
Precision=8 bits
Destination ID=0 (Luminance)
DQT, Row #0: 4 4 4 4 11 8 19 19 
DQT, Row #1: 4 4 4 4 8 15 19 19 
DQT, Row #2: 4 4 8 8 8 15 26 23 
DQT, Row #3: 4 8 8 11 19 23 34 34 
DQT, Row #4: 4 8 11 19 23 26 19 38 
DQT, Row #5: 15 11 19 23 26 34 26 34 
DQT, Row #6: 8 23 30 26 34 38 34 30 
DQT, Row #7: 23 26 30 30 38 38 34 34 
Approx quality factor = 83.44 (scaling=33.13 variance=68.50)
----
Precision=8 bits
Destination ID=1 (Chrominance)
DQT, Row #0: 8 4 8 8 34 34 34 34 
DQT, Row #1: 8 8 15 19 34 34 34 34 
DQT, Row #2: 8 15 23 34 34 34 34 34 
DQT, Row #3: 8 34 34 34 34 34 34 34 
DQT, Row #4: 23 34 34 34 34 34 34 34 
DQT, Row #5: 34 34 34 34 34 34 34 34 
DQT, Row #6: 34 34 34 34 34 34 34 34 
DQT, Row #7: 34 34 34 34 34 34 34 34 
Approx quality factor = 82.58 (scaling=34.84 variance=40.56)
 
*** Marker: SOF0 (Baseline DCT) (xFFC0) ***
OFFSET: 0x00007688
Frame header length = 17
Precision = 8
Number of Lines = 720
Samples per Line = 1280
Image Size = 1280 x 720
Raw Image Orientation = Landscape
Number of Img components = 3
Component[1]: ID=0x01, Samp Fac=0x22 (Subsamp 1 x 1), Quant Tbl Sel=0x00 (Lum: Y)
Component[2]: ID=0x02, Samp Fac=0x11 (Subsamp 2 x 2), Quant Tbl Sel=0x01 (Chrom: Cb)
Component[3]: ID=0x03, Samp Fac=0x11 (Subsamp 2 x 2), Quant Tbl Sel=0x01 (Chrom: Cr)

Full Results Here --> http://www.jerseyforged.com/sampleclips/MJPEG_Tests/P1000586.JPG.txt

Clip 2)
http://www.jerseyforged.com/sampleclips/MJPEG_Tests/P1000587.JPG

Quicktime Reports Video at 54.71 mbps

Code:

*** Marker: DQT (xFFDB) ***
Define a Quantization Table.
OFFSET: 0x00007602
Table length = 132
----
Precision=8 bits
Destination ID=0 (Luminance)
DQT, Row #0: 1 1 1 1 2 1 3 3 
DQT, Row #1: 1 1 1 1 1 2 3 3 
DQT, Row #2: 1 1 1 1 1 2 4 3 
DQT, Row #3: 1 1 1 2 3 3 5 5 
DQT, Row #4: 1 1 2 3 3 4 3 5 
DQT, Row #5: 2 2 3 3 4 5 4 5 
DQT, Row #6: 1 3 4 4 5 5 5 4 
DQT, Row #7: 3 4 4 4 5 5 5 5 
Approx quality factor = 97.33 (scaling=5.34 variance=2.68)
----
Precision=8 bits
Destination ID=1 (Chrominance)
DQT, Row #0: 1 1 1 1 5 5 5 5 
DQT, Row #1: 1 1 2 3 5 5 5 5 
DQT, Row #2: 1 2 3 5 5 5 5 5 
DQT, Row #3: 1 5 5 5 5 5 5 5 
DQT, Row #4: 3 5 5 5 5 5 5 5 
DQT, Row #5: 5 5 5 5 5 5 5 5 
DQT, Row #6: 5 5 5 5 5 5 5 5 
DQT, Row #7: 5 5 5 5 5 5 5 5 
Approx quality factor = 97.48 (scaling=5.04 variance=0.70)
 
*** Marker: SOF0 (Baseline DCT) (xFFC0) ***
OFFSET: 0x00007688
Frame header length = 17
Precision = 8
Number of Lines = 720
Samples per Line = 1280
Image Size = 1280 x 720
Raw Image Orientation = Landscape
Number of Img components = 3
Component[1]: ID=0x01, Samp Fac=0x22 (Subsamp 1 x 1), Quant Tbl Sel=0x00 (Lum: Y)
Component[2]: ID=0x02, Samp Fac=0x11 (Subsamp 2 x 2), Quant Tbl Sel=0x01 (Chrom: Cb)
Component[3]: ID=0x03, Samp Fac=0x11 (Subsamp 2 x 2), Quant Tbl Sel=0x01 (Chrom: Cr)

Full results here-->>
http://www.jerseyforged.com/sampleclips/MJPEG_Tests/P1000587.JPG.txt

billy fattey · Jun 12, 2010

ptool 3.36 settings:

ticked mjpeg size 1280m->1920m
ticked mjpeg encoder 1280m->1920m
mjpeg quality 512>352>220>200
mjpeg table 24 24 24 24

JPEGsnoop 1.4.2 by Calvin Hass
http://www.impulseadventure.com/photo/
-------------------------------------

Filename: [\\.psf\Home\Desktop\DCIM\100_PANA\P1000439.MOV]
Filesize: [57282294] Bytes

*** Marker: DQT (xFFDB) ***
Define a Quantization Table.
OFFSET: 0x00007F02
Table length = 132
----
Precision=8 bits
Destination ID=0 (Luminance)
DQT, Row #0: 1 1 1 1 2 1 3 3
DQT, Row #1: 1 1 1 1 1 2 3 3
DQT, Row #2: 1 1 1 1 1 2 4 3
DQT, Row #3: 1 1 1 2 3 3 5 5
DQT, Row #4: 1 1 2 3 3 4 3 5
DQT, Row #5: 2 2 3 3 4 5 4 5
DQT, Row #6: 1 3 4 4 5 5 5 4
DQT, Row #7: 3 4 4 4 5 5 5 5
Approx quality factor = 97.33 (scaling=5.34 variance=2.68)
----
Precision=8 bits
Destination ID=1 (Chrominance)
DQT, Row #0: 1 1 1 1 5 5 5 5
DQT, Row #1: 1 1 2 3 5 5 5 5
DQT, Row #2: 1 2 3 5 5 5 5 5
DQT, Row #3: 1 5 5 5 5 5 5 5
DQT, Row #4: 3 5 5 5 5 5 5 5
DQT, Row #5: 5 5 5 5 5 5 5 5
DQT, Row #6: 5 5 5 5 5 5 5 5
DQT, Row #7: 5 5 5 5 5 5 5 5
Approx quality factor = 97.48 (scaling=5.04 variance=0.70)

Martin Koch · Jun 12, 2010

GrgurMG I think that is exactly the kind of report tester13 needs ONLY that you should analyze a frame in the actual .MOV file not a still photo.

Vitaliy Kiselev · Jun 12, 2010

Martin Koch said:
GrgurMG I think that is exactly the kind of report tester13 needs ONLY that you should analyze a frame in the actual .MOV file not a still photo.

I requested to analyse JPG image made for each MOV.
It is made using same sampling, same resolution, etc.
So many information about its Q table can be useful.

I don't get how to make JPEGsnoop to work with GH1 MOV files.
It needs some modifications.

Martin Koch · Jun 12, 2010

tester13 said:
I don't get how to make JPEGsnoop to work with GH1 MOV files.
It needs some modifications.

I analysed original files from http://www.dpreview.com/reviews/panasonicdmcgh1/page19.asp which works fine.

Also billy fattey above seems to have had success with JPEGsnoop and his patched movie file.

billy fattey · Jun 12, 2010

Martin Koch said:
I analysed original files from http://www.dpreview.com/reviews/panasonicdmcgh1/page19.asp which works fine.

Also billy fattey above seems to have had success with JPEGsnoop and his patched movie file.

When I first opened the .mov with JPEGsnoop it said, "NOTE: File did not start with JPEG marker. Consider using [Tools->Img Search Fwd] to locate embedded JPEG."

So I searched forward 2 or 3 times until it found a frame.

Martin Koch · Jun 12, 2010

billy fattey said:
When I first opened the .mov with JPEGsnoop it said, "NOTE: File did not start with JPEG marker. Consider using [Tools->Img Search Fwd] to locate embedded JPEG."

So I searched forward 2 or 3 times until it found a frame.

Yes that's the normal behaviour. I'm glad it works with patched files.
I remember on some samples of movie files from other cameras I also found thumbnail images so make sure you check the frame size to be sure you're looking at an actual movie frame.

IanB · Jun 13, 2010

This is from the .mov that I created

This is from the .mov that I created

QUALITY SETTINGS [ 384, 330, 300, 276 ]
TABLE SETTINGS [ 24, 24, 24, 24 ]

No 1080p or anything like that just standard 720p mjpeg 30fps
File is 79.1 mbps according to Quick-time
3.36 pTool set

Original File to come...

Table from JPG in folder

Define a Quantization Table.
OFFSET: 0x00007602
Table length = 132
----
Precision=8 bits
Destination ID=0 (Luminance)
DQT, Row #0: 1 1 1 1 2 1 3 3
DQT, Row #1: 1 1 1 1 1 2 3 3
DQT, Row #2: 1 1 1 1 1 2 4 3
DQT, Row #3: 1 1 1 2 3 3 5 5
DQT, Row #4: 1 1 2 3 3 4 3 6
DQT, Row #5: 2 2 3 3 4 5 4 5
DQT, Row #6: 1 3 5 4 5 6 5 5
DQT, Row #7: 3 4 5 5 6 6 5 5
Approx quality factor = 97.27 (scaling=5.47 variance=2.65)
----
Precision=8 bits
Destination ID=1 (Chrominance)
DQT, Row #0: 1 1 1 1 5 5 5 5
DQT, Row #1: 1 1 2 3 5 5 5 5
DQT, Row #2: 1 2 3 5 5 5 5 5
DQT, Row #3: 1 5 5 5 5 5 5 5
DQT, Row #4: 3 5 5 5 5 5 5 5
DQT, Row #5: 5 5 5 5 5 5 5 5
DQT, Row #6: 5 5 5 5 5 5 5 5
DQT, Row #7: 5 5 5 5 5 5 5 5
Approx quality factor = 97.48 (scaling=5.04 variance=0.70)

Table from using 'Frame-Forward x3 (maybe 3-4 frames into the .mov file)' in JPEGsnoop tools of .mov file.
CTRL+2 advances the frame quickly without using the menu.....

*** Marker: DQT (xFFDB) ***
Define a Quantization Table.
OFFSET: 0x00131762
Table length = 132
----
Precision=8 bits
Destination ID=0 (Luminance)
DQT, Row #0: 1 1 1 1 2 1 3 3
DQT, Row #1: 1 1 1 1 1 2 3 3
DQT, Row #2: 1 1 1 1 1 2 4 3
DQT, Row #3: 1 1 1 2 3 3 5 5
DQT, Row #4: 1 1 2 3 3 4 3 6
DQT, Row #5: 2 2 3 3 4 5 4 5
DQT, Row #6: 1 3 5 4 5 6 5 5
DQT, Row #7: 3 4 5 5 6 6 5 5
Approx quality factor = 97.27 (scaling=5.47 variance=2.65)
----
Precision=8 bits
Destination ID=1 (Chrominance)
DQT, Row #0: 1 1 1 1 5 5 5 5
DQT, Row #1: 1 1 2 3 5 5 5 5
DQT, Row #2: 1 2 3 5 5 5 5 5
DQT, Row #3: 1 5 5 5 5 5 5 5
DQT, Row #4: 3 5 5 5 5 5 5 5
DQT, Row #5: 5 5 5 5 5 5 5 5
DQT, Row #6: 5 5 5 5 5 5 5 5
DQT, Row #7: 5 5 5 5 5 5 5 5
Approx quality factor = 97.48 (scaling=5.04 variance=0.70)

Table from using 'Frame-Forward x20 (maybe 20-25 frames into the .mov file)' in JPEGsnoop tools of .mov file.

*** Marker: DQT (xFFDB) ***
Define a Quantization Table.
OFFSET: 0x009CEE82
Table length = 132
----
Precision=8 bits
Destination ID=0 (Luminance)
DQT, Row #0: 1 1 1 1 2 2 4 4
DQT, Row #1: 1 1 1 1 2 3 4 4
DQT, Row #2: 1 1 2 2 2 3 5 5
DQT, Row #3: 1 2 2 2 4 5 7 7
DQT, Row #4: 1 2 2 4 5 5 4 8
DQT, Row #5: 3 2 4 5 5 7 5 7
DQT, Row #6: 2 5 6 5 7 8 7 6
DQT, Row #7: 5 5 6 6 8 8 7 7
Approx quality factor = 96.39 (scaling=7.22 variance=3.41)
----
Precision=8 bits
Destination ID=1 (Chrominance)
DQT, Row #0: 2 1 2 2 7 7 7 7
DQT, Row #1: 2 2 3 4 7 7 7 7
DQT, Row #2: 2 3 5 7 7 7 7 7
DQT, Row #3: 2 7 7 7 7 7 7 7
DQT, Row #4: 5 7 7 7 7 7 7 7
DQT, Row #5: 7 7 7 7 7 7 7 7
DQT, Row #6: 7 7 7 7 7 7 7 7
DQT, Row #7: 7 7 7 7 7 7 7 7
Approx quality factor = 96.33 (scaling=7.35 variance=1.90)

Vitaliy Kiselev · Jun 13, 2010

For many files JPEGSnoop show just error (even for normal 848).
Plus it is dumb then working with MOV files.
It looks like author don't know that MOV file format specification exists.

IanB · Jun 13, 2010

1920x1080 settings from Papas (not the 1440x1080 stretched but the true 1920x1080)

with 4:2:2 color turned on, I got 2 seconds of video, that was it before the camera stopped recording, it didn't freeze, but it automatically stops recording.

Quality Settings: Same as previouse post
87.6 mbps (approx)

Original file:
https://stillmaninteriors.dc1.netfirms.com/Images/P1080391.MOV

*** Marker: DQT (xFFDB) ***
Define a Quantization Table.
OFFSET: 0x00115CA2
Table length = 132
----
Precision=8 bits
Destination ID=0 (Luminance)
DQT, Row #0: 2 2 2 2 5 3 8 8
DQT, Row #1: 2 2 2 2 3 6 8 8
DQT, Row #2: 2 2 3 3 3 6 11 9
DQT, Row #3: 2 3 3 5 8 9 14 14
DQT, Row #4: 2 3 5 8 9 11 8 16
DQT, Row #5: 6 5 8 9 11 14 11 14
DQT, Row #6: 3 9 13 11 14 16 14 13
DQT, Row #7: 9 11 13 13 16 16 14 14
Approx quality factor = 92.95 (scaling=14.10 variance=11.76)
----
Precision=8 bits
Destination ID=1 (Chrominance)
DQT, Row #0: 3 2 3 3 14 14 14 14
DQT, Row #1: 3 3 6 8 14 14 14 14
DQT, Row #2: 3 6 9 14 14 14 14 14
DQT, Row #3: 3 14 14 14 14 14 14 14
DQT, Row #4: 9 14 14 14 14 14 14 14
DQT, Row #5: 14 14 14 14 14 14 14 14
DQT, Row #6: 14 14 14 14 14 14 14 14
DQT, Row #7: 14 14 14 14 14 14 14 14
Approx quality factor = 92.90 (scaling=14.21 variance=6.19)

Vitaliy Kiselev · Jun 13, 2010

Yes, look at my explanation in main thread.
Bitrate with Pappas settings is too much even for normal 1920, only 1440.
Even 1440 in 422 require much lower quality settings.

IanB · Jun 13, 2010

ok

ok

Ok, thanks Tester13 but I am wondering if this data is helping you? Or do we already have what you need?

IB

Vitaliy Kiselev · Jun 13, 2010

IanB said:
Ok, thanks Tester13 but I am wondering if this data is helping you? Or do we already have what you need?
IB

Quantization tables are lowest possible level to change quality.
Each table is directly associated to JPEG quality setting.
They all are scaled from source table.

IanB · Jun 13, 2010

This may already be done, and it may not help you

This may already be done, and it may not help you

Here are the Q tables from the latest 4:2:2 color patch with 720 mjpg and the papas settings.

*** Marker: DQT (xFFDB) ***
Define a Quantization Table.
OFFSET: 0x0025C6A2
Table length = 132
----
Precision=8 bits
Destination ID=0 (Luminance)
DQT, Row #0: 1 1 1 1 2 1 3 3
DQT, Row #1: 1 1 1 1 1 2 3 3
DQT, Row #2: 1 1 1 1 1 2 4 3
DQT, Row #3: 1 1 1 2 3 3 5 5
DQT, Row #4: 1 1 2 3 3 4 3 5
DQT, Row #5: 2 2 3 3 4 5 4 5
DQT, Row #6: 1 3 4 4 5 5 5 4
DQT, Row #7: 3 4 4 4 5 5 5 5
Approx quality factor = 97.33 (scaling=5.34 variance=2.68)
----
Precision=8 bits
Destination ID=1 (Chrominance)
DQT, Row #0: 1 1 1 1 5 5 5 5
DQT, Row #1: 1 1 2 3 5 5 5 5
DQT, Row #2: 1 2 3 5 5 5 5 5
DQT, Row #3: 1 5 5 5 5 5 5 5
DQT, Row #4: 3 5 5 5 5 5 5 5
DQT, Row #5: 5 5 5 5 5 5 5 5
DQT, Row #6: 5 5 5 5 5 5 5 5
DQT, Row #7: 5 5 5 5 5 5 5 5
Approx quality factor = 97.48 (scaling=5.04 variance=0.70)

MJPEG Encoder Research, no questions here

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