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8mm film scanner / How many pictures possible per ten seconds?

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Offline reyalp

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Re: 8mm film scanner / How many pictures possible per ten seconds?
« Reply #70 on: 03 / December / 2015, 13:00:25 »
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At waterwingz suggestion, I have merged the threads related to this project. This should help anyone with a similar project find all the relevant information.
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Offline heikkiH

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Re: 8mm film scanner / How many pictures possible per ten seconds?
« Reply #71 on: 07 / December / 2015, 07:21:41 »
Hi all once more -

the system works perfect now. I get reeallly stable pics, only one per frame.

But now I can only shoot 350 pics, or 85MB, before the camera reports that the memory card is full. I just found a 2GB card, and the camera reports before starting the run that there is space for 4,110 images. I wonder what happens with the memory management?

When I take the card out and put it in the card reader, it shows as full, but there's no more files than 350. I need to test without the script still, to see whether it affects the situation, but I am more than slightly baffled by this.

The image shows resource manager's view after I have moved the 350 pics away from the card.

I wonder if this is a known thing or whether I am missing something?

Cheers

-h.

EDIT: It seems to use 6MB per image - see
« Last Edit: 07 / December / 2015, 08:32:02 by heikkiH »
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Offline waterwingz

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Re: 8mm film scanner / How many pictures possible per ten seconds?
« Reply #72 on: 07 / December / 2015, 08:32:20 »
Quote from: heikkiH on 07 / December / 2015, 07:21:41
the system works perfect now. I get reeallly stable pics, only one per frame.
That's nice to hear!

Quote
But now I can only shoot 350 pics, or 85MB, before the camera reports that the memory card is full. I just found a 2GB card, and the camera reports before starting the run that there is space for 4,110 images. When I take the card out and put it in the card reader, it shows as full, but there's no more files than 350. I need to test without the script still, to see whether it affects the situation, but I am more than slightly baffled by this.
My guess is that you have enabled saving RAW or DNG images.  Depending on how your CHDK is configured,  it may be saving those files in their own folder - in either A/RAW or A/DCIM.  Normally, you will notice if RAW or DNG is enabled as it takes a few seconds to save the image.  Maybe not so much with your older camera and smaller file size.

A word of caution here. One lesser known feature of CHDK is an annoying set of keyboard shortcuts , that can cause unexpected behaviour if you don't know that they are there.  One of those shortcuts silently toggles RAW on & off when you press one of the keys while in <ALT> mode.  If you have the CHDK OSD display on and RAW display enabled,  you might notice it.  Otherwise you just get a nasty surprise when you run out of SD card space.

So your solution here is to find the RAW files,  delete them,  and then go to the CHDK RAW menu and disable RAW.  You might find you can run your scanner a little faster once that is done.

EDIT :
Quote from: heikkiH on 07 / December / 2015, 07:21:41
EDIT: It seems to use 6MB per image - see https://youtu.be/8G-E6Z87JR0
There it is!  Notice the letters DNG in the lower right hand corner?  You have RAW enabled (and saving in DNG format). Thanks for posting the video clip.
« Last Edit: 07 / December / 2015, 08:36:21 by waterwingz »
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Offline heikkiH

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Re: 8mm film scanner / How many pictures possible per ten seconds?
« Reply #73 on: 07 / December / 2015, 08:34:27 »
I'll be sure to check that. The images I got from the camera were JPG files at 220KB each, however, and then some mystery dark matter filled up all the rest.
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Offline waterwingz

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Re: 8mm film scanner / How many pictures possible per ten seconds?
« Reply #74 on: 07 / December / 2015, 08:35:54 »
Quote from: heikkiH on 07 / December / 2015, 08:34:27
I'll be sure to check that. The images I got from the camera were JPG files at 220KB each, however, and then some mystery dark matter filled up all the rest.
See my edit that quotes your edit above.  The camera is definitely saving RAW - you can see it on the OSD and the additional storage per shot is a dead giveaway!

With that change,  you should be able to speed up the scanner. 

I also noticed that the Shot Count message that I added to the script is not showing?  Are you using the earlier version or is this another artifact of accidentally saving RAW and keeping the camera really busy.
« Last Edit: 07 / December / 2015, 08:39:10 by waterwingz »
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Offline heikkiH

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Re: 8mm film scanner / How many pictures possible per ten seconds?
« Reply #75 on: 07 / December / 2015, 08:37:05 »
I disabled it and am now testing again :D
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Offline heikkiH

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Re: 8mm film scanner / How many pictures possible per ten seconds?
« Reply #76 on: 07 / December / 2015, 08:43:46 »
And yes, it was indeed RAW. Man you're good over here!
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Offline waterwingz

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Re: 8mm film scanner / How many pictures possible per ten seconds?
« Reply #77 on: 07 / December / 2015, 08:59:06 »
Quote from: heikkiH on 07 / December / 2015, 08:43:46
And yes, it was indeed RAW. Man you're good over here!
Not so much good - just learned that the hard way, just like you.
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Offline heikkiH

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Re: 8mm film scanner / How many pictures possible per ten seconds?
« Reply #78 on: 07 / December / 2015, 09:00:44 »
I have learned an awful lot in this project, and wish to thank you all for the assistance! It's been really fun!

Cheers,

-h.
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Offline heikkiH

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Re: 8mm film scanner / How many pictures possible per ten seconds?
« Reply #79 on: 21 / December / 2015, 04:57:48 »
As a final shot, (pun intended), here's a little video of the entire, complete, DIY 3D printed Telecine featuring CHDK:

I am grabbing 3,000+ images per run, then just stopping Arduino, sucking the images out, and going on. 22 images per minute, ie. a little more than one second of film per minute.

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