This Python sample has a corresponding C++ sample.
metavision_sync.py shows how to use Python API for synchronizing two event-based cameras.
The source code of this sample can be found in
when installing Metavision SDK from installer or packages. For other deployment methods, check the page
Path of Samples.
As explained in the camera synchronization page, you need to connect the two event-based cameras using a synchronization cable. Specifically, the Sync Out signal of the master camera needs to be connected to the Sync In interface of the slave camera. One of the camera will be the master camera, while the other will be the slave camera.
See the Timing Interface section for more information about Prophesee’s cameras Sync In and Sync Out interfaces.
You will need to start the slave camera first, followed by the master camera. You can connect both cameras to the same PC or to two different PCs.
When connecting the two cameras on the same PC, make sure to specify the serial number of the camera you want to use (SERIAL_NUMBER in the commands below). You can retrieve it using Metavision Platform Info Application (the Serial Number it the Serial from the output, e.g. 00ca0009).
The sample visualizes CD events on the screen. Note that the slave camera will not visualize any events until the master camera is started.
How to start
To start the sample, first run the slave camera:
python3 metavision_sync.py -s SERIAL_NUMBER -m slave
python metavision_sync.py -s SERIAL_NUMBER -m slave
Then start the master camera:
python3 metavision_sync.py -s SERIAL_NUMBER -m master
python metavision_sync.py -s SERIAL_NUMBER -m master
When starting the second camera (the master), you may get an error message similar to
[HAL][ERROR] Camera is busy (r=-6).
This error message can be safely ignored. It is only an symptom of the sample trying to connect to all the connected cameras
to retrieve their serial number, and randomly trying the slave first which is already connected (i.e. “busy”).
To check for additional options:
You cannot run this sample from a pre-recorded RAW file, as the synchronization only works with live camera. RAW files recorded with synchronized cameras will have synchronized timestamps, but can be played separately using any available RAW player.