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can`t video mode and can`t ev mode

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can`t video mode and can`t ev mode
« on: 06 / July / 2012, 20:28:26 »
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hi,
my camera is canon powershot a450.
and now i use chdk.
but when i use video mode, movie stops suddenly(and also camera power is off).
i don`t know why movie stops.
please tell me how movie don`t stop.

i set up like below:

video mode : bitrate
video bitrate : 3x
video quality : 99
fast video control : check
video quality control : check
enable optical zoom : check
mute during zooming : check
af key : set
show remaining videoti : both
refreshrate : 1

----------------------------------------------------
and i also use fast ev switch
but can`t use ev mode
when i take the picture , if i click the ev up button , camera power is off
i don`t know why ev mode can`t use

please tell me how to use ev mode without camera error
thank you very much
« Last Edit: 06 / July / 2012, 20:35:08 by a450 »

Re: can`t video mode and can`t ev mode
« Reply #1 on: 06 / July / 2012, 20:36:24 »
but when i use video mode, movie stops suddenly.
....
video quality : 99
You have selected a video quality setting that produces data faster than it can be written to the SD memory card on your camera.    You could try buying a better card ( Class 10 ) - otherwise lower the quality setting until this behaviour stops (try values around 70 to start).

Ported :   A1200    SD940   G10    Powershot N    G16

Re: can`t video mode and can`t ev mode
« Reply #2 on: 06 / July / 2012, 20:40:56 »
thanks to your advice
but i use class 10 16gb sdhc card
i don`t know this card`s speed, but this is cheap card than sandisk sdhc card
i will try to setup by your advice
thank you

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Offline reyalp

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Re: can`t video mode and can`t ev mode
« Reply #3 on: 06 / July / 2012, 20:45:02 »
thanks to your advice
but i use class 10 16gb sdhc card
i don`t know this card`s speed, but this is cheap card than sandisk sdhc card
i will try to setup by your advice
thank you
It's probably the camera that can't keep up, not the card.
Don't forget what the H stands for.


Re: can`t video mode and can`t ev mode
« Reply #4 on: 06 / July / 2012, 20:53:33 »
thanks to your advice but i use class 10 16gb sdhc card i don`t know this card`s speed, but this is cheap card than sandisk sdhc card
If it says Class 10 then it should be the currently available top speed product.  You can test your card's speed using the CHDK 
Miscellaneous Stuff -> Debug Parameters -> Benchmark
menu option.   

Useful to see how your cheap card compares to an expensive one.   There seems to be some question of how certain manufacturers arrive at their ratings ...

And as reyalp posted,  your card only needs to be faster than your camera ..
Ported :   A1200    SD940   G10    Powershot N    G16

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Offline srsa_4c

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Re: can`t video mode and can`t ev mode
« Reply #5 on: 06 / July / 2012, 21:05:00 »
video quality control : check
enable optical zoom : check
Don't enable both of these settings: on your camera both functions map to the up/down buttons, so you'll end up changing the video quality while zooming.

Re: can`t video mode and can`t ev mode
« Reply #6 on: 06 / July / 2012, 21:19:28 »
thanks your your advices

reyalp // my camera can`t support high quality video ?

waterwingz // i tested now .

screen write : 5000kb/s 59fps
memory write : 43401kb/s
flash-card write(ram) : 4353kb/s
write(mem) : 6053kb/s
write(64k) : 4501kb/s
read(64k) : 6206kb/s

does my sdcard support high quality video?

srsa_4c // i try to test this setup. thanks
« Last Edit: 06 / July / 2012, 21:27:04 by a450 »

Re: can`t video mode and can`t ev mode
« Reply #7 on: 06 / July / 2012, 21:21:15 »
thanks for your reply
my camera can`t support high quality video mode?
Quality is a relative term.  CHDK will let you increase the quality until your camera / memory card stops.  Its up to you if its good enough  (or if you can even see the difference).
Ported :   A1200    SD940   G10    Powershot N    G16


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Offline reyalp

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Re: can`t video mode and can`t ev mode
« Reply #8 on: 06 / July / 2012, 21:23:22 »
thanks for your reply
my camera can`t support high quality video mode?
In all the tests I've seen, you can't push the quality very much over the Canon defaults on any camera.
Don't forget what the H stands for.

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Offline srsa_4c

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Re: can`t video mode and can`t ev mode
« Reply #9 on: 06 / July / 2012, 21:43:57 »
flash-card write(ram) : 4353kb/s
does my sdcard support high quality video?
That proves what reyalp has written above.
It's probably the camera that can't keep up, not the card.
Try to lower the quality or bitrate setting until you find one that the camera can handle. You can use a high contrast / high detail scene to test the stability of recording.

 

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