I try to use the raspivid circular buffer but I can not find any documentation of:
The size of the ring buffer. Is it modifiable? (by time, by frames, by memory occupation? ....)
In the case of using the -s option
How can the signal be sent from a python script?
What kind of signal does raspivid support?
Since I want to launch raspivid as a subprocess in the background to continue obtaining data from accelerometers, I guess I can not use picamera.
I am absolutely lost without access to documentation.