System Info
Platform: Nano B01
Gstreamer: v1.14.5
Two Raspi cams: v2.1 (IMX219) CSI-2
Problem
I can get 720p@120hz when using one camera, but when I add the second camera it only gets about 720p@60hz. The same issue persists even when I use 360p for both cameras and when I set the bitrate. The Gstreamer pipeline I am using is posted below. The metadata of the output files shows the bitrate at ~775kbps and the frame rate at 120, but when I open the files in ImageJ one of them always has ~120hz and the other is always around 60hz.
What can I do to get 120hz with both cameras?
gst-launch-1.0 nvarguscamerasrc sensor_id=1 num-buffers=2000 aelock=true gainrange=“1 1” ispdigitalgainrange=“1 1” exposuretimerange=“1000000 1000000” exposurecompensation=-2 ! ‘video/x-raw(memory:NVMM),width=640, height=360, framerate=120/1, format=NV12’ ! omxh264enc bitrate=200000 control-rate=2 ! qtmux ! filesink location=test.mp4 -e
EDIT: I think I’ve found the reason why the fps doesn’t increase when using a lower resolution. In the docs for the raspi cam v2 it says the camera has 8 sensor modes (including one for 480p), but when I run $ v4l2-ctl --list-formats-ext there are only 6 sensor modes, the lowest resolution of which being 720p. So when I try to reduce the resolution the camera is still sending 720p images to the jetson, which are then resized to 480p at a later, less efficient stage. I guess I need to try a different camera :(
TLDR: v4l2 doesn’t support any sensor modes <720p, so when I try a lower resolution I am still using 720p.