Build python-opencv with gstreamer support

build_opencv_with_gstreamer.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+# When using RTSP gstreamer can provides a way lower latency then ffmpeg
+# and exposes more options to tweak the connection. However, the pypi
+# version of python-opencv is build without gstreamer. Thus, we need to
+# build our own python wheel.
+
+# adapted from https://github.com/opencv/opencv-python/issues/530#issuecomment-1006343643
+
+# install gstreamer dependencies
+sudo apt-get install --quiet -y --no-install-recommends \
+  gstreamer1.0-gl \
+  gstreamer1.0-opencv \
+  gstreamer1.0-plugins-bad \
+  gstreamer1.0-plugins-good \
+  gstreamer1.0-plugins-ugly \
+  gstreamer1.0-tools \
+  libgstreamer-plugins-base1.0-dev \
+  libgstreamer1.0-0 \
+  libgstreamer1.0-dev 
+
+# ffmpeg deps
+sudo apt install ffmpeg libgtk2.0-dev libavformat-dev libavcodec-dev libavutil-dev libswscale-dev libtbb-dev libjpeg-dev libpng-dev libtiff-dev
+
+OPENCV_VER="84" #fix at 4.10.0.84, or use rolling release: "4.x"
+STARTDIR=$(pwd)
+TMPDIR=$(mktemp -d)
+
+# Build and install OpenCV from source.
+echo $TMPDIR
+
+# pyenv compatibility
+cp .python-version $TMPDIR
+
+cd "${TMPDIR}"
+git clone --branch ${OPENCV_VER} --depth 1 --recurse-submodules --shallow-submodules https://github.com/opencv/opencv-python.git opencv-python-${OPENCV_VER}
+cd opencv-python-${OPENCV_VER}
+export ENABLE_CONTRIB=0
+# export ENABLE_HEADLESS=1
+# We want GStreamer support enabled.
+export CMAKE_ARGS="-DWITH_GSTREAMER=ON -DWITH_FFMPEG=ON"
+python -m pip wheel . --verbose -w $STARTDIR
+
+# # Install OpenCV
+# python3 -m pip install opencv_python*.whl
+# cp opencv_python*.whl $STARTDIR

poetry.lock

@@ -2927,6 +2927,106 @@ nativelib = ["pyobjc-framework-Cocoa", "pywin32"]
 objc = ["pyobjc-framework-Cocoa"]
 win32 = ["pywin32"]
 
+[[package]]
+name = "setproctitle"
+version = "1.3.3"
+description = "A Python module to customize the process title"
+optional = false
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+    {file = "setproctitle-1.3.3-pp38-pypy38_pp73-macosx_10_9_x86_64.whl", hash = "sha256:59335d000c6250c35989394661eb6287187854e94ac79ea22315469ee4f4c244"},
+    {file = "setproctitle-1.3.3-pp38-pypy38_pp73-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:c3ba57029c9c50ecaf0c92bb127224cc2ea9fda057b5d99d3f348c9ec2855ad3"},
+    {file = "setproctitle-1.3.3-pp38-pypy38_pp73-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:d876d355c53d975c2ef9c4f2487c8f83dad6aeaaee1b6571453cb0ee992f55f6"},
+    {file = "setproctitle-1.3.3-pp38-pypy38_pp73-win_amd64.whl", hash = "sha256:224602f0939e6fb9d5dd881be1229d485f3257b540f8a900d4271a2c2aa4e5f4"},
+    {file = "setproctitle-1.3.3-pp39-pypy39_pp73-macosx_10_9_x86_64.whl", hash = "sha256:d7f27e0268af2d7503386e0e6be87fb9b6657afd96f5726b733837121146750d"},
+    {file = "setproctitle-1.3.3-pp39-pypy39_pp73-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:f5e7266498cd31a4572378c61920af9f6b4676a73c299fce8ba93afd694f8ae7"},
+    {file = "setproctitle-1.3.3-pp39-pypy39_pp73-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:33c5609ad51cd99d388e55651b19148ea99727516132fb44680e1f28dd0d1de9"},
+    {file = "setproctitle-1.3.3-pp39-pypy39_pp73-win_amd64.whl", hash = "sha256:eae8988e78192fd1a3245a6f4f382390b61bce6cfcc93f3809726e4c885fa68d"},
+    {file = "setproctitle-1.3.3.tar.gz", hash = "sha256:c913e151e7ea01567837ff037a23ca8740192880198b7fbb90b16d181607caae"},
+]
+
+[package.extras]
+test = ["pytest"]
+
 [[package]]
 name = "setuptools"
 version = "68.2.2"
@@ -3540,4 +3640,4 @@ watchdog = ["watchdog (>=2.3)"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10,<3.12,"
-content-hash = "bb276860d4df035d3f9814bf4ed87ee16b0e4a0d5fa6a124c23140bef41caffb"
+content-hash = "65e5518fd7bc216a72206768f621251e8f2ade9ec07ef0af1d3926492fc6fd70"

pyproject.toml

@@ -36,6 +36,7 @@ tsmoothie = "^1.0.5"
 pyglet = "^2.0.15"
 pyglet-cornerpin = "^0.3.0"
 opencv-python = {file="./opencv_python-4.10.0.84-cp310-cp310-linux_x86_64.whl"}
+setproctitle = "^1.3.3"
 
 [build-system]
 requires = ["poetry-core"]

trap/plumber.py

@@ -14,6 +14,8 @@ from trap.animation_renderer import run_animation_renderer
 from trap.socket_forwarder import run_ws_forwarder
 from trap.tracker import run_tracker
 
+from setproctitle import setproctitle, setthreadtitle
+
 
 logger = logging.getLogger("trap.plumbing")
 
@@ -33,10 +35,12 @@ class ExceptionHandlingProcess(Process):
         atexit.register(exit_handler)
         signal.signal(signal.SIGTERM, exit_handler)
         signal.signal(signal.SIGINT, exit_handler)
+        setproctitle(f"trap-{self.name}")
 
         try:
             super(Process, self).run()
-        except Exception as e:
+            print("finished ", self.name)
+        except BaseException as e:
             logger.critical(f"Exception in {self.name}")
             logger.exception(e)
             self._kwargs['is_running'].clear()
@@ -63,7 +67,7 @@ def start():
         log_handlers.append(socket_handler)
 
     queue_listener = QueueListener(q, *log_handlers, respect_handler_level=True)
-    queue_listener.start()
+    
 
     # root = logging.getLogger()
     logging.basicConfig(
@@ -90,10 +94,10 @@ def start():
     if args.render_file or args.render_url or args.render_window:
         if not args.render_no_preview or args.render_file or args.render_url:
             procs.append(
-                ExceptionHandlingProcess(target=run_preview_renderer, kwargs={'config': args, 'is_running': isRunning}, name='renderer')
+                ExceptionHandlingProcess(target=run_preview_renderer, kwargs={'config': args, 'is_running': isRunning}, name='preview')
             )
         procs.append(
-            ExceptionHandlingProcess(target=run_animation_renderer, kwargs={'config': args, 'is_running': isRunning}, name='map_renderer')
+            ExceptionHandlingProcess(target=run_animation_renderer, kwargs={'config': args, 'is_running': isRunning}, name='renderer')
         )
 
     if not args.bypass_prediction:
@@ -101,16 +105,41 @@ def start():
             ExceptionHandlingProcess(target=run_prediction_server, kwargs={'config': args, 'is_running':isRunning}, name='inference'),
         )
 
+    try:
         logger.info("start")
         for proc in procs:
             proc.start()
 
+        # if start the listener before the subprocesses, it becomes a mess, because the
+        # running threat is forked too, but cannot easily be stopped in the forks.
+        # Thus, only start the queue-listener threat _after_ starting processes
+        queue_listener.start()
+
         # wait for processes to clean up
         for proc in procs:
             proc.join()
         
-    logger.info('Stop')
+        isRunning.clear()
         
+        logger.info('Stop')
+    except BaseException as e:
+        # mainly for KeyboardInterrupt
+        # but in any case, on error all processed need to be signalled to shut down
+        logger.critical(f"Exception in plumber")
+        logger.exception(e)
+        isRunning.clear()
+
+        # while True:
+        #     time.sleep(2)
+        #     any_alive = False
+        #     alive = [proc for proc in procs if proc.is_alive()]
+        #     print("alive: ", [p.name for p in alive])
+        #     if len(alive) < 1:
+        #         break
+        print('stop listener')
+        queue_listener.stop()
+        print('stopped listener')
+    print("finished plumber")
 
 if __name__ == "__main__":
     start()

trap/preview_renderer.py

@@ -675,8 +675,10 @@ class PreviewRenderer:
             self.out_writer.release() 
         if self.streaming_process:
             # oddly wrapped, because both close and release() take time.
+            logger.info('wait for closing stream')
             self.streaming_process.wait()
 
+        logger.info('stopped')
 # colorset = itertools.product([0,255], repeat=3) # but remove white
 # colorset = [(0, 0, 0),
 #  (0, 0, 255),