Originally posted by bvg Yes, the p&p took 1.34 gb for 20' record and k-5 took 3.14 (why not 4?)gb for 8'41" record (all for720p30).
Out of RAM is the most likely answer.
Let me explain the process you might understand why then.
this the process tree as far as i know how it works.
sensor > RAM > processing > RAM > write to SD card
So your sensor writes to the RAM because the sensor needs to "dump" the frame before it records the next frame.
The processor then takes the frame from the RAM and process it but it has little to non memory of his own so it needs to also dump that to the RAM so it can keep on processing.
Another part of the processor takes the process information from the RAM and put it on the SD card.
So long as the sensor has room to "dump" the frames (his information) so that it can keep on recording new frames it will go on.
A slow down in the processor and/or writing to the SD card will fill the RAM memory leaving less and less room for the sensor to "dump" his information and so it will stop when it can't.