Hi,
this topic is specific to the s-series cameras, which have the ability to take pictures DURING video recording. however flash is disabled. i dont know why exactly canon disabled the flash during video recordings, maybe it is because of power or something along this - i dont know.
But i'd really like to have flash enabled, because i use that to trigger my external flash guns. this way i can make a video of a photosession and at the same time use the "videocamera" to take the real photos. also it is useful for lowlight situations where you have enough light for video, but not enough light for (non blurry) still images.
i tested setting propcase 16 (digicII) during recording - the propcase gets set and stays at the given value (1 in s3is case for ALWAYS ON) but when i press the shutter flash isnt used. in still picture mode this overriding of the flash param works via script (useful for example for DISABLING the flash via script because once you pop up the flash in manual mode it is ALWAYS ON, no matter if you press the dedicated flash button, when you dont want to pop down the flash).
sifting through the s3is dump i see a few functions and names with "flash" in it, dont really know where to start though.
first maybe i wanted to start a discussion on what people think WHY canon built the cams so that they dont use flash during video recording. maybe there are good reasons and its better to not tap into that realm (camera damage anyone?). if there arent good reasons then maybe some more skilled asm gurus can hack something useful together!?
regards, phox