500d development - page 167 - DSLR Hack development - CHDK Forum

500d development

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Offline a1ex

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Re: 500d development
« Reply #1660 on: 26 / October / 2011, 13:34:22 »
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I have no idea... and I've closed the console now :)

Edit: the values were roughly close to the real ones, so it worked... sort of. But I think the units were not dB.

The values from 550D are used by Canon code in computing audio level, so I think those are correct. If you would like to brush up your math skills, you can check them by hand.
« Last Edit: 26 / October / 2011, 13:51:41 by a1ex »

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Offline Coutts

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Re: 500d development
« Reply #1661 on: 26 / October / 2011, 15:35:58 »
so i guess it's simply a reference for db values. ie: if raw level is x, then it's y db. alex said the db reading in the old ML builds was reading about 2db higher than the actual sound.
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Re: 500d development
« Reply #1662 on: 26 / October / 2011, 15:50:16 »
Maybe a dumb question but is there a purpose why +5 and +6 in Nightvision turns green?

Also, would increasing the gain in post-process yield the same results as using this feature?
« Last Edit: 26 / October / 2011, 15:56:01 by pat_loonytoon »

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Offline a1ex

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Re: 500d development
« Reply #1663 on: 26 / October / 2011, 15:56:01 »
I guess there's some kind of overflow in Canon's white balance code.

Post-processing uses different curves (you don't know exactly Canon's curve) and is applied after compression. I guess that's the only difference.

A quick test here: http://groups.google.com/group/ml-devel/browse_thread/thread/3a810f3b7430e903

Try bulb ramping to see Canon's curve (the correspondence between EV and brightness values).

Probably night vision is more useful for framing and focusing in very low light (when display is almost black with original firmware).
« Last Edit: 26 / October / 2011, 15:59:18 by a1ex »


Re: 500d development
« Reply #1664 on: 26 / October / 2011, 16:25:34 »
On the lower settings I think the gain is acceptable and could be useful in recordings.
For timelapse photography at night this feature I'm sure is useful as well.

For Infrared Night Vision I suppose a camera hack or Infrared Filter would have to be used in addition to some Infrared light.

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Offline a1ex

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Re: 500d development
« Reply #1666 on: 26 / October / 2011, 17:16:27 »
Whoa, what a giant step!

Thank you again for this cool hack!

Is with this new firmware hack any news about videos?

Re: 500d development
« Reply #1667 on: 26 / October / 2011, 23:27:50 »
Nice! Now audio meter and audio remote shot work properly. :D
But, i don't understand. If audio_thresholds does not exist in 500D, what is 0xFF4631F4?

Edit (add):
Btw, there is audio_thresholds in ML for 500D non-unified version, pointed to 0xFF48E58C (firmware 1.1.0), and audio features work with no problems...

Edit (again):
Changed audio_thresholds address to 0xFF48E6AC. It gives similar effect to your fix, and audio remote shot works  with this address...

This sounds like great news, does this mean that we can look forward to a build for this soon?


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Offline Coutts

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Re: 500d development
« Reply #1668 on: 26 / October / 2011, 23:48:59 »
Canon 5d
Canon 50mm f/1.8
Sigma 24mm f/1.8

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Re: 500d development
« Reply #1669 on: 27 / October / 2011, 03:54:27 »
new build up ;)

http://groups.google.com/group/ml-devel/msg/b1c7c49cb5e48a2f

Dear Coutts and anyone here,
The URL:http://bit.ly/ug9Fjg is always a tragic to me. I cannot open the http://bit.ly/ug9Fjg here.
Please be kind to paste out the Zip file address or give an attachment to be downloaded in this forum.
Thanks a lot to all of you!!~~

 

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