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sx200is more detail and technical datail about video mode

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Offline parstonda

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sx200is more detail and technical datail about video mode
« on: 29 / May / 2021, 09:59:28 »
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hi friends
i have a signal trigger that have variable duration in every pulse (pulse duration is variable In between  1/30 second 1/10 )
how can i use this pulse signal to effect expos time in video record mode to achieve one frame record per pulse signal
while if signal duration is 1/10 second specific frame expose duration been 1/10
or  if signal duration is 1/30 second specific frame expose duration been 1/30
in other word i want synchronies video mode with this signal
i want control camera with chdkptp
every body have more information about video timer controlling that i use it in my case
https://magiclantern.fandom.com/wiki/VideoTimer
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Offline parstonda

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Video exposure time analysis from recordings with video time insertion
« Reply #1 on: 29 / May / 2021, 10:32:46 »
hi
I have question about tagging every frame of the recorded video in chdkptp and i found in other site information about video time insertion can help me to do that evry body have Experian's about  this case ?
 http://www.dangl.at/ausruest/vid_tim/vid_tim1.htm
Video exposure time analysis
from recordings with video time insertion

Some terms used in this page

UTC ... Universal Time Coordinated
GPS ... Global Positioning System
VTI ... Video Time Inserter
PAL ... Video colour standard using 50 fields or 25 frames per second (Phase Alternating Line)
NTSC ... Video colour standard using 59.94 fields or 29.97 frames per second (National Television Systems Committee)
CCIR ... Monochrom (B/W) version of PAL (Consultative Committee for International Radio)
EIA ... Monochrom (B/W) version of NTSC (Electronic Industries Association)
field ... two interlaced video fields, odd and even, form a complete video image also named as video frame
Odd ... first interlaced video field with odd numbered lines of a video frame counted from top as 1, 3, 5, ...
Even ... second interlaced video field with even numbered lines of a video frame counted from top as 2, 4, 6, ...
frame ... complete video image consisting of two interlaced Odd and Even video fields
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« Last Edit: 29 / May / 2021, 10:36:38 by parstonda »
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Offline reyalp

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Re: sx200is more detail and technical datail about video mode
« Reply #2 on: 29 / May / 2021, 15:43:18 »
I merged these topics as they appear to refer to the same project. As I've said several times before, it's much easier to follow posts related to the same thing are in one thread.

Quote from: parstonda on 29 / May / 2021, 09:59:28
hi friends
i have a signal trigger that have variable duration in every pulse (pulse duration is variable In between  1/30 second 1/10 )
how can i use this pulse signal to effect expos time in video record mode to achieve one frame record per pulse signal
while if signal duration is 1/10 second specific frame expose duration been 1/10
or  if signal duration is 1/30 second specific frame expose duration been 1/30
in other word i want synchronies video mode with this signal
i want control camera with chdkptp
every body have more information about video timer controlling that i use it in my case
https://magiclantern.fandom.com/wiki/VideoTimer
There is no reason to assume the PowerShot firmware is the same as EOS firmware in this area. It might be similar, it might not be. If you want to do this, you'll need to reverse engineer your specific firmware. I recommendGhidra for reverse engineering.

Some information about controlling video exposure can be found in https://chdk.fandom.com/wiki/Manual_Exposure_Control_for_Video_Recording

Some information about syncing with video refresh can be found in https://chdk.setepontos.com/index.php?topic=13363.0

Neither of these will directly address your needs, but they may provide some starting points.

It's not clear to me how the external time generators you linked would be relevant.
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