Hi, I believe that the correct way to set the --headless mode is by passing --headless=true instead of --headless alone as I've seen in one of the examples (detectnet-camera at least).
Here is an example session where you can see --headless=true working, while --headless alone fails.
drakorg@drakorg-desktop:~/workspace/nspi$ python3
Python 3.6.9 (default, Apr 18 2020, 01:56:04)
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> import jetson.utils
>>> vs = jetson.utils.videoSource('rtsp://admin:[email protected]', sys.argv + ['--headless'])
URI -- missing/invalid IP port from rtsp://admin:[email protected], default to port 554
[gstreamer] initialized gstreamer, version 1.14.5.0
[gstreamer] gstDecoder -- creating decoder for admin
nvbuf_utils: Could not get EGL display connection
Opening in BLOCKING MODE
NvMMLiteOpen : Block : BlockType = 261
NVMEDIA: Reading vendor.tegra.display-size : status: 6
NvMMLiteBlockCreate : Block : BlockType = 261
[gstreamer] gstDecoder -- failed to discover stream info
[gstreamer] gstDecoder -- try manually setting the codec with the --input-codec option
[gstreamer] gstDecoder -- failed to create decoder for rtsp://admin:[email protected]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
Exception: jetson.utils -- failed to create videoSource device
>>> vs = jetson.utils.videoSource('rtsp://admin:[email protected]', sys.argv + ['--headless=true'])
URI -- missing/invalid IP port from rtsp://admin:[email protected], default to port 554
[gstreamer] gstDecoder -- creating decoder for admin
Opening in BLOCKING MODE
NvMMLiteOpen : Block : BlockType = 261
NVMEDIA: Reading vendor.tegra.display-size : status: 6
NvMMLiteBlockCreate : Block : BlockType = 261
[gstreamer] gstDecoder -- discovered video resolution: 1280x720 (framerate 25.000000 Hz)
[gstreamer] gstDecoder -- discovered video caps: video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, level=(string)3.1, profile=(string)main, width=(int)1280, height=(int)720, framerate=(fraction)25/1, interlace-mode=(string)progressive, chroma-format=(string)4:2:0, bit-depth-luma=(uint)8, bit-depth-chroma=(uint)8, parsed=(boolean)true
[gstreamer] gstDecoder -- pipeline string:
[gstreamer] rtspsrc location=rtsp://admin:[email protected] ! queue ! rtph264depay ! h264parse ! omxh264dec ! video/x-raw ! appsink name=mysink
[video] created gstDecoder from rtsp://admin:[email protected]
------------------------------------------------
gstDecoder video options:
------------------------------------------------
-- URI: rtsp://admin:[email protected]
- protocol: rtsp
- location: admin
- port: 554
-- deviceType: ip
-- ioType: input
-- codec: h264
-- width: 1280
-- height: 720
-- frameRate: 25.000000
-- bitRate: 0
-- numBuffers: 4
-- zeroCopy: true
-- flipMethod: none
-- loop: 0
------------------------------------------------
>>>
That's the reason detectnet-camera example does not work from commandline despite specifying the headless switch, as seen below:
drakorg@drakorg-desktop:~/workspace/nspi/scripts/jetson-nano/jetson-inference$ detectnet-camera "rtsp://admin:[email protected]" --headless
URI -- missing/invalid IP port from rtsp://admin:[email protected], default to port 554
[gstreamer] initialized gstreamer, version 1.14.5.0
[gstreamer] gstDecoder -- creating decoder for admin
nvbuf_utils: Could not get EGL display connection
Opening in BLOCKING MODE
NvMMLiteOpen : Block : BlockType = 261
NVMEDIA: Reading vendor.tegra.display-size : status: 6
NvMMLiteBlockCreate : Block : BlockType = 261
[gstreamer] gstDecoder -- failed to discover stream info
[gstreamer] gstDecoder -- try manually setting the codec with the --input-codec option
[gstreamer] gstDecoder -- failed to create decoder for rtsp://admin:[email protected]
detectnet: failed to create input stream
drakorg@drakorg-desktop:~/workspace/nspi/scripts/jetson-nano/jetson-inference$ detectnet-camera "rtsp://admin:[email protected]" --headless=true
URI -- missing/invalid IP port from rtsp://admin:[email protected], default to port 554
[gstreamer] initialized gstreamer, version 1.14.5.0
[gstreamer] gstDecoder -- creating decoder for admin
nvbuf_utils: Could not get EGL display connection
Opening in BLOCKING MODE
NvMMLiteOpen : Block : BlockType = 261
NVMEDIA: Reading vendor.tegra.display-size : status: 6
NvMMLiteBlockCreate : Block : BlockType = 261
[gstreamer] gstDecoder -- failed to discover stream info
[gstreamer] gstDecoder -- try manually setting the codec with the --input-codec option
[gstreamer] gstDecoder -- failed to create decoder for rtsp://admin:[email protected]
detectnet: failed to create input stream
Now, if you see how detectnet-camera handles the switch, it only adds "--headless" to the argv (under some condition), while it should be "--headless=true".
drakorg@drakorg-desktop:~/workspace/nspi/scripts/jetson-nano/jetson-inference$ cat python/examples/detectnet.py
#!/usr/bin/python3
#
# Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
#
import jetson.inference
import jetson.utils
import argparse
import sys
# parse the command line
parser = argparse.ArgumentParser(description="Locate objects in a live camera stream using an object detection DNN.",
formatter_class=argparse.RawTextHelpFormatter, epilog=jetson.inference.detectNet.Usage() +
jetson.utils.videoSource.Usage() + jetson.utils.videoOutput.Usage() + jetson.utils.logUsage())
parser.add_argument("input_URI", type=str, default="", nargs='?', help="URI of the input stream")
parser.add_argument("output_URI", type=str, default="", nargs='?', help="URI of the output stream")
parser.add_argument("--network", type=str, default="ssd-mobilenet-v2", help="pre-trained model to load (see below for options)")
parser.add_argument("--overlay", type=str, default="box,labels,conf", help="detection overlay flags (e.g. --overlay=box,labels,conf)\nvalid combinations are: 'box', 'labels', 'conf', 'none'")
parser.add_argument("--threshold", type=float, default=0.5, help="minimum detection threshold to use")
parser.add_argument("--width", type=int, default=1280, help="desired width of camera stream (default is 1280 pixels)")
parser.add_argument("--height", type=int, default=720, help="desired height of camera stream (default is 720 pixels)")
is_headless = ["--headless"] if sys.argv[0].find('console.py') != -1 else [""]
try:
opt = parser.parse_known_args()[0]
except:
print("")
parser.print_help()
sys.exit(0)
# load the object detection network
net = jetson.inference.detectNet(opt.network, sys.argv, opt.threshold)
# create video sources & outputs
input = jetson.utils.videoSource(opt.input_URI, argv=sys.argv)
output = jetson.utils.videoOutput(opt.output_URI, argv=sys.argv+is_headless)
# process frames until the user exits
while True:
# capture the next image
img = input.Capture()
# detect objects in the image (with overlay)
detections = net.Detect(img, overlay=opt.overlay)
# print the detections
print("detected {:d} objects in image".format(len(detections)))
for detection in detections:
print(detection)
# render the image
output.Render(img)
# update the title bar
output.SetStatus("{:s} | Network {:.0f} FPS".format(opt.network, net.GetNetworkFPS()))
# print out performance info
net.PrintProfilerTimes()
# exit on input/output EOS
if not input.IsStreaming() or not output.IsStreaming():
break
Thank you.
Regards.
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