Dear *,
we are testing our camera and we are seeing the glass-to-glass latency of around 140ms.
We tried with:
sudo ~/jetson_clocks.sh
gst-launch-1.0 nvcamerasrc queue-size=10 sensor-id=0 fpsRange='60 60' auto-exposure='off' ! \
'video/x-raw(memory:NVMM), width=1936, height=1096, format=I420, framerate=60/1' ! \
nvoverlaysink sync=true enable-last-sample=false
we also get 140ms with argus camera
cd tegra_multimedia_api/argus/build/apps/camera/ui/camera
./argus_camera
Only when we used the pre-compiled binary from nvidia
libgstnvcamera.so
found on forum so that the queue-size can be set to 6
then used
gst-launch-1.0 nvcamerasrc queue-size=6 sensor-id=0 fpsRange='60 60' auto-exposure='off' ! \
'video/x-raw(memory:NVMM), width=1936, height=1096, format=I420, framerate=60/1' ! \
nvoverlaysink sync=true enable-last-sample=false
and we have around 93ms with this new binary file.
But this is huge latency, we see that you have with OV5693 latency of only 2-3 frames with argus and 5 frames with gstreamer.
https://devtalk.nvidia.com/default/topic/1026587/jetson-tx2/csi-latency-is-over-80-milliseconds-/1
Please can you tell us what else can we change to improve the latency??
Sensor Resolution: 1936x1096
Sensor FPS:60
Devicetree:
mode0 { // MODE_1936X1086
mclk_khz = "26000";
//mclk_khz = "24000";
num_lanes = "2";
tegra_sinterface = "serial_a";
//discontinuous_clk = "yes";
discontinuous_clk = "yes";
dpcm_enable = "false";
cil_settletime = "0";
//dynamic_pixel_bit_depth = "12";
csi_pixel_bit_depth = "10";
mode_type = "bayer";
pixel_phase = "bggr";
active_w = "1936";
active_h = "1096";
//pixel_t = "bayer_bggr";
//readout_orientation = "90";
readout_orientation = "0";
//line_length = "2640";
line_length = "2072";
inherent_gain = "1";
//mclk_multiplier = "6.4";
mclk_multiplier = "5.6";
//pix_clk_hz = "332800000";
pix_clk_hz = "144000000";
//min_gain_val = "1.0";
//max_gain_val = "16";
min_gain_val = "1.0";
max_gain_val = "3.0";
min_hdr_ratio = "1";
max_hdr_ratio = "64";
min_framerate = "60";
max_framerate = "60";
//min_exp_time = "34";
//max_exp_time = "550385";
min_exp_time = "30";
max_exp_time = "15000";
};
Br.
