Queation: Is that possible to record based on a button click?

[wlkobe]

Currently I only found a method to record with pre-defined number of frames. Are there any method to start and stop the recording based on event, just like a button click? Thanks

[bastibe]

Record a small number of frames (say, 1024) repeatedly until the event occurs, and stitch them all together for a continuous recording. There will be no gap between them.