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About more versatile using Video mode with SX130 IS

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Offline Pier

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About more versatile using Video mode with SX130 IS
« on: 20 / January / 2012, 13:41:15 »
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In video mode before shooting, wie can change exposure within a range of + -2 in 1/3 steps.
With UP key and dial knob.After Recording start this possibility is disabled.
Is the way CHDK to enable this possibility during the record ? Will be great.
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Offline outslider

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Re: About more versatile using Video mode with SX130 IS
« Reply #1 on: 20 / January / 2012, 20:37:47 »
It might be possible by overriding ISO and aperture values from CHDK. If would require a script that checks keys and increase/decrease ISO or Av for specific pressess. Have no time for doing this now. But maybe you'd try?
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Offline philmoz

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Re: About more versatile using Video mode with SX130 IS
« Reply #2 on: 20 / January / 2012, 20:50:58 »
Quote from: outslider on 20 / January / 2012, 20:37:47
It might be possible by overriding ISO and aperture values from CHDK. If would require a script that checks keys and increase/decrease ISO or Av for specific pressess. Have no time for doing this now. But maybe you'd try?

There is an experimental script that works on some cameras; but it is prone to crashing.
http://chdk.setepontos.com/index.php?topic=5295.msg68622#msg68622

Phil.
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Offline Pier

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Re: About more versatile using Video mode with SX130 IS
« Reply #3 on: 21 / January / 2012, 05:02:49 »
Thanks to philmoz and outsider for the replaye's.
I'm asking because with this script http://chdk.setepontos.com/index.php?topic=6113.0 page 1 first post, I"ve do many changes to adjust it to work with my SX130IS.The changes was in accordance with " shooting.c" file and his Tv, Av and Sv tables for SX130Is.I've lose many times to made script work but no success as yet.Interesting is that that script work 90% of attempts in Indoor conditions lowlevel light , but outside on day light he don't.
Will try with funnel's PT_DoAELock and PT_UnlockAE commands to see what will happen.
Thanks again.
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Offline Pier

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Re: About more versatile using Video mode with SX130 IS
« Reply #4 on: 21 / January / 2012, 09:03:01 »
Last test - Manual Video exposure on SX130IS
with the script - http://chdk.setepontos.com/index.php?topic=5295.msg68622#msg68622

I've made quick test.Hmm, maybe this work.With some notes:
- When script start (but not in Record state) Cam do not like very bright and very dark
  scenes on the LCD screen ..may crash and not alow you to make changes.
  To avoid this, point the cam to scene with little bit less brightness, start the script
  and do the changes (Tv,Av,SV).Good idea is to be near normal values if scenes you will record are bright and vice-versa.
-Cam do not like Sv=0.Do not go down to zero.Cam can crash.This can be changed in the script to start with Sv=128.
For SX130IS settigns on my side were:
-Tv from 480 - 704 (1/30s - 1/160s). I stop here.No crash.
-Av from 347(F=3.4) to 576(f=8.0)...till 672 (maybe F=16).Higher values do not made change of the brightness.
-Sv from 128 to 896.What ISO is related with this figures I do't know.If you try to go to 1024 cam stop recording saved the clip on SD card and script is interrupted.Maybe this is not a crash ?? You may continue.
Sv=1024 is acceptable only in lowlight  conditions when script start (no record mode) and you made changes.
Generally I think Canon FW watch and do not allow some combinations in video mode even they are in the cam limits.
Use the script with caution.And modify it to your cam.I hope that some GURU Developers will try to fix it.
Thanks for help.
========================================
BTW - during the tests my cam reported Error E09 - JPEGtimeout.Cam still work FINE.
« Last Edit: 21 / January / 2012, 09:06:08 by Pier »
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