Hi,
In nvarguscamerasrc, the sensor mode is automatically selected according to caps of source pad. If you would like to set the sensor mode, you can use sensor-mode property:
sensor-mode : Set the camera sensor mode to use. Default -1 (Select the best match)
flags: readable, writable
Integer. Range: -1 - 255 Default: -1
If the behavior does not meet your usecase. You may consider to upgrade to r32.4.2. We have nvarguscamerasrc open source in the release.
https://developer.nvidia.com/embedded/L4T/r32_Release_v4.2/Sources/T186/public_sources.tbz2
https://developer.nvidia.com/embedded/L4T/r32_Release_v4.2/Sources/T210/public_sources.tbz2