HDR video experiments - page 3 - General Discussion and Assistance - CHDK Forum
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HDR video experiments

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Offline funnel

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Re: HDR video experiments
« Reply #20 on: 27 / March / 2012, 18:00:00 »
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Yes. I improved my script and also added the option to set the neutral exposure manually until I figure out how to calculate it properly.

On my camera I must call the function named "CancelAdjCdsMode" to return the camera in normal AE after CDSGain or it remains stuck at a certain iso.

I didn't do much. I tried to use the values from the props Bv,Sv,Tv,Av for calculations but it didn't work well.
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Offline Microfunguy

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Re: HDR video experiments
« Reply #21 on: 27 / March / 2012, 18:53:52 »
Yes but on your A570, where (memory location) did you monitor the override ISO value ?
Also, where (memory location) did you monitor the actual gain value ?
I am not seeing a Canon-set gain value unless I set one.
I am setting 0x105070+4 to a gain value and calling 0xFFB5B740 with no parameters.

I am running out of time, tomorrow I will test the Panasonic FZ38 I bought some time ago for this application.

There are many 'creative' modes for movies, you can set shutter speed from 1/30 to 1/20,000 sec (!).
Also, there is the option of MJPEG encoding which will give better quality for extracted frames.
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Offline funnel

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Re: HDR video experiments
« Reply #22 on: 28 / March / 2012, 05:28:25 »
For s95 you can monitor cdsgain at 0xA798 or 0xA798+0x8 I guess. Found in sub_FFA7F754.

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Offline funnel

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Re: HDR video experiments
« Reply #23 on: 28 / March / 2012, 14:28:37 »
I uploaded my new lua script on the first post. Now I'm using a cds_gain ram address(0xBB08) to get the initial sv value and a noname prop 269 for initial shutter speed value. It appears to be working right.
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