One Step Closer

Plugin 개발 할 때에 Memory Leak에 대해서 확인해보기 위해서 valgrind를 붙여보았는데, valgrind를 붙이면 launcher가 정상 동작 하지 않는다. 원인을 찾을 수 없어서 GStreamer에서 Memory leak에 대한 수단을 제공하지 않을까 해서 찾아보니 아래와 같이 Debugging을 할 수 있는 방법이 있다.

GST_DEBUG="GST_TRACER:7" GST_TRACERS="leaks" 

위와 같이 환경변수를 설정하고 동작시에 아래와 같이 종료 이후로 남아있는 메모리에 대해서 추적해준다.

0:00:33.676884568  6771 0x556451e88840 TRACE             GST_TRACER :0:: object-alive, type-name=(string)GstBuffer, address=(gpointer)0x7f835dc012c0, description=(string)buffer: 0x7f835dc012c0, pts 0:00:45.833522174, dts 99:99:99.999999999, dur 0:00:00.100000000, size 2764800, offset 458, offset_end 459, flags 0x0, ref-count=(uint)1, trace=(string);
0:00:33.676887333  6771 0x556451e88840 TRACE             GST_TRACER :0:: object-alive, type-name=(string)GstBuffer, address=(gpointer)0x7f834738a700, description=(string)buffer: 0x7f834738a700, pts 99:99:99.999999999, dts 99:99:99.999999999, dur 99:99:99.999999999, size 2764800, offset none, offset_end none, flags 0x0, ref-count=(uint)1, trace=(string);
0:00:33.676890357  6771 0x556451e88840 TRACE             GST_TRACER :0:: object-alive, type-name=(string)GstBuffer, address=(gpointer)0x7f86d44efe20, description=(string)buffer: 0x7f86d44efe20, pts 0:00:53.533522174, dts 99:99:99.999999999, dur 0:00:00.100000000, size 2764800, offset 535, offset_end 536, flags 0x0, ref-count=(uint)1, trace=(string);

Typename과 Address, ref-count 등을 남겨준다.
다만 이 메모리가 어떤것인지 자세히 나오지 않아서 이 방법에 대해서도 검토가 필요할 것 같다.

GSTShark 설치가 필요함

1. 관련 Package 설치

sudo apt install graphviz libgraphviz-dev
sudo apt install octave epstool babeltrace

2. GSTShark 설치

$ git clone https://github.com/RidgeRun/gst-shark/
$ cd gst-shark/
$ ./autogen.sh --prefix /usr/ --libdir /usr/lib/x86_64-linux-gnu/
$ make
$ sudo make install

3. 테스트

GST_DEBUG="GST_TRACER:7" GST_TRACERS="proctime" \
	gst-launch-1.0 videotestsrc num-buffers=10000 ! \
	'video/x-raw, format=(string)YUY2, width=(int)640, height=(int)480, framerate=(fraction)30/1' \
	! videorate max-rate=30 ! videoconvert ! queue ! avenc_h263p ! queue ! avimux ! fakesink

4. 로그 확인

0:00:01.994246894 1151846 0x562427ae88a0 TRACE             GST_TRACER :0:: proctime, element=(string)videoconvert0, time=(string)0:00:00.000032109;
0:00:01.994395874 1151846 0x562427ae88f0 TRACE             GST_TRACER :0:: proctime, element=(string)avenc_h263p0, time=(string)0:00:00.000372912;
0:00:01.994401155 1151846 0x562427ae88f0 TRACE             GST_TRACER :0:: proctime, element=(string)queue0, time=(string)0:00:00.000154431;
0:00:01.994401865 1151846 0x562427ae8850 TRACE             GST_TRACER :0:: proctime, element=(string)queue1, time=(string)0:00:00.000006357;
0:00:01.994594740 1151846 0x562427ae88a0 TRACE             GST_TRACER :0:: proctime, element=(string)capsfilter0, time=(string)0:00:00.000000482;
0:00:01.994598173 1151846 0x562427ae88a0 TRACE             GST_TRACER :0:: proctime, element=(string)videorate0, time=(string)0:00:00.000003703;
0:00:01.994630612 1151846 0x562427ae88a0 TRACE             GST_TRACER :0:: proctime, element=(string)videoconvert0, time=(string)0:00:00.000032159;
0:00:01.994774671 1151846 0x562427ae88f0 TRACE             GST_TRACER :0:: proctime, element=(string)avenc_h263p0, time=(string)0:00:00.000372839;
0:00:01.994779616 1151846 0x562427ae88f0 TRACE             GST_TRACER :0:: proctime, element=(string)queue0, time=(string)0:00:00.000149048;
0:00:01.994780333 1151846 0x562427ae8850 TRACE             GST_TRACER :0:: proctime, element=(string)queue1, time=(string)0:00:00.000006217;

5. Graphviz 이용

$ ./gstshark-plot gstshark_2022-05-30_19\:16\:42/ -s pdf

1. gstreamer 설치

$ sudo apt-get install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgstreamer-plugins-bad1.0-dev gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-doc gstreamer1.0-tools gstreamer1.0-x gstreamer1.0-alsa gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5 gstreamer1.0-pulseaudio

2. Tutorial Code

$ git clone https://gitlab.freedesktop.org/gstreamer/gst-docs 

3. Tutorial Test

$ gcc basic-tutorial-1.c -o basic-tutorial-1 `pkg-config --cflags --libs gstreamer-1.0`