Ixus 75 build-in intervalometer - Script Writing - CHDK Forum
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Ixus 75 build-in intervalometer

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Offline Markeight

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Ixus 75 build-in intervalometer
« on: 04 / August / 2009, 05:15:11 »
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Hi everyone, i have a Ixus 75 (sd750) and it have a build in intervalometer that can take only picture at 640x480, and the interval can only be setted to 1 or 2 seconds.

Is there a way to use this build-in intervalometer but changeing the inerval on the shoots?

I'd like to kwon also if, with a script, there is the possibility to use this build in intervalometer with variable shutter speed, something to take sunset time lapse for example.

Sorry for the bad English and sorry for the probably stupid question, i've discovered CHDK only few days ago.

Thanks
« Last Edit: 04 / August / 2009, 05:18:21 by Markeight »
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Offline fe50

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Re: Ixus 75 build-in intervalometer
« Reply #1 on: 04 / August / 2009, 05:40:20 »
Hello & welcome, Markeight !
Quote from: Markeight on 04 / August / 2009, 05:15:11
Hi everyone, i have a Ixus 75 (sd750) and it have a build in intervalometer that can take only picture at 640x480, and the interval can only be setted to 1 or 2 seconds.
Is there a way to use this build-in intervalometer but changeing the inerval on the shoots?
It should be doable in a script, use propset #165

Quote
I'd like to kwon also if, with a script, there is the possibility to use this build in intervalometer with variable shutter speed, something to take sunset time lapse for example.
There are several time lapse scripts, also some for sunset time lapse, here in the forum...with a script you can adjust whatever you want...
...try the forum search function with "sunset time lapse".
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Offline Markeight

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Re: Ixus 75 build-in intervalometer
« Reply #2 on: 04 / August / 2009, 06:06:55 »
Quote from: fe50 on 04 / August / 2009, 05:40:20
Hello & welcome, Markeight !
It should be doable in a script, use propset #165
Thanks for the reply... excuse me but i'm really a newby, from the page you linked i can understand that with command like "set_prop" we can adjust some parameter but...that's all i've understood!!

I mean...i've successfully installed the chdk in my camera (and that's already a big succecc :D )
now i'd like to use the build in intervalometer (that is on the "Video" mode of the camera) with different intervals than the default one.
What should i do?

Quote from: fe50 on 04 / August / 2009, 05:40:20
There are several time lapse scripts, also some for sunset time lapse, here in the forum...with a script you can adjust whatever you want...
...try the forum search function with "sunset time lapse".

Ok, i've copied the "sunset4.bas" script, gonna try it as soon as i can.

Thanks again
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Offline fe50

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Re: Ixus 75 build-in intervalometer
« Reply #3 on: 04 / August / 2009, 07:43:10 »
With the following little script you can override the Canon time lapse value...

Code: (sdlbasic) [Select]
rem override Canon intervall, Digic III prop165, value in ms
@title propcase
@param a propid
@default a 165
@param b new value in s
@default b 5

b = b *1000
get_prop a c
print "Old value : " , c
set_prop a b
print "Now set to: " , b
sleep 2000
end
When you run this script, the intervall value will be set to 5 seconds (adjustable in the script menu), this new value is active until you change the value in the Canon menu or until you power off the camera.

...just load the script, set the time you want & start it with the shutter button; then leave <Alt> mode and make your time lapse or whatever else you want to do...

PS: You can also set other propcases with this script, DO NOT change the first parameter (propid, with default = 165) until you exactly know what you are doing...
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Offline Markeight

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Re: Ixus 75 build-in intervalometer
« Reply #4 on: 04 / August / 2009, 11:46:41 »
You couldn't be much clear and kind!!Thank you very much, i've just tried the script and everything's ok!!

Thank you again
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Offline Markeight

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Re: Ixus 75 build-in intervalometer
« Reply #5 on: 06 / August / 2009, 05:23:21 »
Sorry to annoy you again guys, i have another stupid question.
I cannot find the right way to override the exposure time in my sd750...
The Manual mode give me the possibility to bring the exposure up to 15 second, but i'd like to have more.

In chdk "Extra photo operation" i can set the Aperture up to 28.40 sec, but than my camera still uses the 15 second on the manual mode.

where do i make a mistake?
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Offline fe50

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Re: Ixus 75 build-in intervalometer
« Reply #6 on: 06 / August / 2009, 07:44:06 »
Quote from: Markeight on 06 / August / 2009, 05:23:21
The Manual mode give me the possibility to bring the exposure up to 15 second, but i'd like to have more.
In chdk "Extra photo operation" i can set the Aperture up to 28.40 sec, but than my camera still uses the 15 second on the manual mode.

No, with CHDK you can set up & use up to 64s on your SD750.

You can either choose one of the values in Override shutter speed - or you can use this setting in combination with the next menu item, the Value factor, for this set Shutterspeed enum type to [Factor]...

Sample:
Override shutter speed  [23]
  Value factor          [1]
Shutterspeed enum type  [Factor]
gives you 23 x 1 = 23 s exposure time.

The Canon OSD don't know anything about the CHDK overrides, it only shows values from the internal Canon list,
so on exposure times beyond the Canon limit of 15s the Canon OSD will always show "15s"...

You can enable the additional CHDK OSD values from the OSD (Misc...) menu to see the "real" override values...
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Offline Markeight

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Re: Ixus 75 build-in intervalometer
« Reply #7 on: 07 / August / 2009, 05:06:20 »
Ok, thank you again for your explanation, i had some problem to understand the meaning of the voice "Factor".
Now it's all clearer.thanks
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Offline Markeight

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Re: Ixus 75 build-in intervalometer
« Reply #8 on: 13 / August / 2009, 05:08:34 »
I know you're going to hate me for all my questions, but i'm new to chdk...forgive me :)

1) My Ixus seems to have no video compression (7 minutes at 640x480 and 30fps takes up to 1gb).
With CHDK i can set the quality from 1 to 99, but i was wondering which is the lowest value i can set without compromising the video quality?

2)The camera has an option to record video @ 60 fps, but only in 320x240 mode.
Is there a script that allows to record 640x480 videos at 60fps?

Thanks guys
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Offline fe50

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Re: Ixus 75 build-in intervalometer
« Reply #9 on: 13 / August / 2009, 07:05:20 »
Quote from: Markeight on 13 / August / 2009, 05:08:34
I know you're going to hate me for all my questions, but i'm new to chdk...forgive me :)
OK, forgiven - but you have to do my gardening then...

Quote
1) My Ixus seems to have no video compression (7 minutes at 640x480 and 30fps takes up to 1gb).
With CHDK i can set the quality from 1 to 99, but i was wondering which is the lowest value i can set without compromising the video quality?
Depends from your needs & your definition of quality...50 or less may give some noticeable artefacts, but the video is still ok...
BTW - you know that you can adjust the settings on-the-fly ?  --> CHDK video parameters

Instead of the "Video Quality" setting you could also test the "Video Bitrate", see the differences in CHDK wikia - Usage...

See also the discussion with some sample bitrates: Ewavr's VideoPlus - Discussion (some informations there may be outdated).

Quote
2)The camera has an option to record video @ 60 fps, but only in 320x240 mode.
Is there a script that allows to record 640x480 videos at 60fps?
No, only the quality setting can be controlled with CHDK.
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