MJPEG Encoder Research, no questions here

[Martin Koch]

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/pana...gh1/page19.asp which works fine.

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

[billy fattey]

I analysed original files from http://www.dpreview.com/reviews/pana...gh1/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]

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]

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]

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]

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.netfir...s/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]

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]

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

IB

[Vitaliy Kiselev]

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]

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)