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Topics - mlrocks

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Is there a way to tell the camera to meter on human subjects' skin tones like face and eyes as the basis, then auto ETTR and dual ISO accordingly?
I used auto ETTR and dual ISO together, and found out that they are good for the whole scene, like a street with high rising buildings under the noon sun, but the human faces may be darkened.

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Raw Video / AI algorithms for debinning
« on: July 17, 2021, 02:58:18 AM »
I just did a test comparing three different modes on 650D: crop 1920x1080 24 fps, anamorphic UHD 24 fps, crop 3K 16 fps. The full resolution mode is not working, I tried but did not test. To my big surprise, the anamorphic UHD footages on my 27 inch computer monitor in full screen mode are much sharper than those of the crop 1080p, just not at the same level. The native resolution of the anamorphic UHD is 1280x1800, just about 20-30% more than that of the crop 1080p, yet looks way more delicious.  The anamorphic UHD looks very similar to the crop 3K 16 fps, almost at the same level.

This really surprises me, because I used to think that the anamorphic modes are just for simple uprezzing, the native resolution is the real thing. Seems that the sensor records all of the information, then Canon has a binning algorithm to combine 3 horizontal pixels to 1 fat pixel. If MLV App has a transformation/debinning algorithm to reverse engineer the Canon binning process, or has an AI algorithm to guess right the original 3 pixels from this fat pixel, then the anamorphic UHD will be very close to the native UHD. This way, the binning process is more like a compression process, with the proper codec, this is actually helping to fit in the maximal writing speed of the camera. After writing in the cards, the information can be read out again by the computer software. If this is true, then binning modes are better than the crop pixel by pixel modes, because there are more information recorded by the sensor and saved in raw files.


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Raw Video / A preset on 5d3 of true 5.7k raw 24p aspect ratio 5?
« on: June 24, 2021, 05:35:30 PM »
On my 650D, I just tested that with Alex's Crop New module, in 1:1 full resolution preset, with maximal fps, 5200x1042, aspect ratio 5, I can get continuous recording with that yummy green dot. If I change the option to Canon Menu (24p) or 23.97p, the resolution changes to 5200x700, I get green dot again.

It seems that the hardware can record full resolution at 24 fps. The limiting bottle neck is the writing speed. If this is the case, adjusting aspect ratio instead of reducing fps is another approach and more practical.

On my 5D3, I only have presets of 4K 12 fps and full res 7.4 fps. I wonder if I can get full res 5.7k 24 fps with an aspect ratio of 5, like 5720x1124 24 fps. That will make 5D3 very advanced. Similarly, a preset of 4096 24p with an aspect ratio of 3 is also very useful.

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Raw Video / 5d3 full res (6k) 24 p canon all-i codec
« on: June 03, 2018, 08:29:04 PM »
Here is the idea:

5D3's stock flow is
1. full res (6k) raw video 30 p stream
2. pixel binning 3x3 to 1
3. compressing to all-i h264 codec

If we can bypass step 2 of pixel binning, we can get full res all-i h264 video clips, which should be within the CF card writing limit of 90 MBS. The computer power of the camera should be able to handle the new workflow, due to the skipping of the pixel binning step.

Cheers, ML really rocks.

5
Raw Video / dual iso+hdr raw video?
« on: August 03, 2016, 06:45:29 PM »
I just did a quick experiment, for hdr, I chose 100/12800; then in dual iso, I chose +6ev to get only 1 stop improved dr. if I only use dual iso, I can get 3.5 stops more with +6ev.
I am thinking maybe in hdr, choose 100/1600, tehn in dual iso, I will choose +3ev.
I do mostly landscape, so movement is not a concern, but dr is. so I am thinking to get maximal dr to combine hdr and dual iso. maybe if it is successful, 5d3 can really compete alexa?
anybody tried dual iso plus hdr for raw video shooting? your input is welcome.

6
1. x5 zoom
2. 1920x1320 24 p raw
3. anamorphic 2x to compress 2x info, now 3840x1320
it is 4k raw now with 3:1 aspect ratio.

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Raw Video / raw video + hdr mode + dual iso module?
« on: November 05, 2013, 07:57:04 AM »
1) I known on 5D3 it is possible to do raw video at 1920x504 48 p, stretched in post to 1920x808 48 p. But I don't care about slow mo. I want HDR raw video.

2) Now is it possible to do raw video 48 p in HDR mode, like the guy did on 5d2 at 30p
http://www.magiclantern.fm/forum/index.php?topic=6075.0
"Shoot RAW at 30fps, HDR video on, set ISO to taste. Extract DNGs, split in AE using time stretch by 50% (offset by a frame for opposite exposure) precompose and slow down to 50% using twixtor, export as TIFF sequence. Batch process each frame in HDR processor of choice, I prefer SNS HDR. adding a lot of patience you will obtain a merged HDR TIFF sequence."

3) Even further, can the new Dual ISO module work at the same time when raw 48 p in HDR mode is recording?

How much dynamic range with this combination achieve if possible?

ML rocks!

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Raw Video / how far can the 1:1 crop mode go?
« on: May 16, 2013, 05:30:08 AM »
http://www.eoshd.com/content/10324/big-news-hands-on-with-continuous-raw-recording-on-canon-5d-mark-iii
"1:1 crop modes -

    3592 x 1320 – I get some drop frames at this res
    2880 x 1320
    2560 x 1080
    1920 x 1080 (full HD crop mode like GH2)
    1280 x 720 (the lower the resolution the more telephoto the crop)
"

According to EOSHD's article, 1:1 crop mode can do 3.5k if CF card is fast enough.
Now I am dreaming, if we have a CF card of 1000 MBps speed, is it possible for ML to intercept somewhere upstream the raw feed right after the sensor acquiring the whole 22 mb frame at 60 fps (720p allows 60 fps suggests that raw feed can do 60 fps)?

You guys rock, cheers ML!

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General Chat / Is 6k raw recording possible with 10x zoom?
« on: May 15, 2013, 09:39:33 AM »
Assuming that we have fast enough CF cards,
we can do 3.5 k raw with 5x zoom with CF card of 150 MBps (Toshiba),
can we do 6 k raw with 10x zoom?

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