1m limit in 60fps movie mode on a620 - General Help and Assistance on using CHDK stable releases - CHDK Forum
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1m limit in 60fps movie mode on a620

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Offline wiichkin

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1m limit in 60fps movie mode on a620
« on: 24 / February / 2008, 17:47:46 »
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Hi All,

I am new to this, so perhaps I am missing something completely basic.

I have an A620 and I've loaded the latest Allbest CHDK on it and enabled the autoboot feature.

The problem I am having is that in 60fps mode I cannot capture more than 1min of video at a time. There is plenty of space left on the card and the camera tells me that I should be able to capture about 12 min. The camera simply stops capturing and I have to start it again by pressing the shutter button. I tried two different 1G SD cards, Kingston Mini 1Gb with adapter and an older Lexar 80x 1Gb card. Both get the same result.

anyone have any ideas?
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Offline PhyrePhoX

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Re: 1m limit in 60fps movie mode on a620
« Reply #1 on: 25 / February / 2008, 00:42:19 »
Hardware limit imo.the 1 minute limit is mentioned in the manual as well.at 60 frames a second,the cams buffer should be pretty busy.on the other hand,canon maybe crippled down this feature on purpose,and this isnt hardware limit at all.
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Offline vit40

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Re: 1m limit in 60fps movie mode on a620
« Reply #2 on: 25 / February / 2008, 02:03:31 »
Well, processor has to deal with 1/2 of pixels it has in VGA 30 fps mode, so I don't believe it's a hardware limit
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Offline eliavecellio

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Re: 1m limit in 60fps movie mode on a620
« Reply #3 on: 25 / February / 2008, 08:17:45 »
Actually, the difference between 320x240 and 640x480 is four-fold - ie four times the pixels. While the difference in frame-rate is only two-fold, so the high-fps/low-res videos actually consume less space (and presumably less buffer) than the normal-fps/high-res videos.

Elia
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