MJPEG Encoder Research, no questions here

**Martin Koch** · 06-12-2010 05:40 AM

For pros and testers only!

Originally Posted by tester13

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.

Originally Posted by tester13

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.ph...pictureid=3413

**Martin Koch** · 06-12-2010 05:46 AM

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

http://www.dvxuser.com/V6/picture.ph...pictureid=3414

**Vitaliy Kiselev** · 06-12-2010 06:49 AM

Originally Posted by Martin Koch

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** · 06-12-2010 07:18 AM

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** · 06-12-2010 09:46 AM

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** · 06-12-2010 12:43 PM

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** · 06-12-2010 12:59 PM

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/samplecl...s/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/samplecl...000586.JPG.txt

Clip 2)
http://www.jerseyforged.com/samplecl...s/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/samplecl...000587.JPG.txt

**billy fattey** · 06-12-2010 01:08 PM

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** · 06-12-2010 01:15 PM

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** · 06-12-2010 01:23 PM

Originally Posted by Martin Koch

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.

Thread: MJPEG Encoder Research, no questions here

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