Hi all, I’m using a Ricoh Z1 with opencv on my ubuntu 20.04. I’ve followed the tutorial to get the streaming running and I can run the gst_loopback form the libuvc-theta-sample (link) succesfully. I get my equirectangular image from the ricoh in my /dev/video0. Then, when I want to get my video frame from openCV in c++ I receive an empty frame with (0,0) resolution. When I do the same with Python all works nice also, I can do it in c++ with a pre-recorded Z1 video and with a common webcam live, but not with the live stream of the Z1.
Has anyone encountered the same issue? A week ago I got it working with opencv in c++ but I don’t know what changed and now is impossible.
I attached the build information of my opencv :
Opencv version: 3.4.0
Buid Information
General configuration for OpenCV 3.4.1 =====================================
Version control: unknown
Platform:
Timestamp: 2021-09-27T11:02:35Z
Host: Linux 5.11.0-36-generic x86_64
CMake: 3.16.3
CMake generator: Unix Makefiles
CMake build tool: /usr/bin/make
Configuration: Release
CPU/HW features:
Baseline: SSE SSE2 SSE3
requested: SSE3
Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
SSE4_1 (3 files): + SSSE3 SSE4_1
SSE4_2 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2
FP16 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
AVX (4 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
AVX2 (8 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
AVX512_SKX (0 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_SKX
C/C++:
Built as dynamic libs?: YES
C++11: YES
C++ Compiler: /usr/bin/c++ (ver 9.3.0)
C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wno-implicit-fallthrough -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wno-implicit-fallthrough -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
C Compiler: /usr/bin/cc
C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wno-implicit-fallthrough -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wno-implicit-fallthrough -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
Linker flags (Release):
Linker flags (Debug):
ccache: NO
Precompiled headers: YES
Extra dependencies: dl m pthread rt
3rdparty dependencies:
OpenCV modules:
To be built: calib3d core features2d flann highgui imgcodecs imgproc java java_bindings_generator objdetect shape stitching superres video videoio viz
Disabled: dnn js ml photo python_bindings_generator ts world
Disabled by dependency: videostab
Unavailable: cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev python2 python3
Applications: apps
Documentation: NO
Non-free algorithms: NO
GUI:
GTK+: YES (ver 3.24.20)
GThread : YES (ver 2.64.6)
GtkGlExt: NO
VTK support: YES (ver 7.1.1)
Media I/O:
ZLib: /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11)
JPEG: /usr/lib/x86_64-linux-gnu/libjpeg.so (ver )
WEBP: /usr/lib/x86_64-linux-gnu/libwebp.so (ver encoder: 0x020e)
PNG: /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.37)
TIFF: /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 / 4.1.0)
JPEG 2000: build (ver 1.900.1)
OpenEXR: /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so (ver 2.3.0)
Video I/O:
DC1394: YES (ver 2.2.5)
FFMPEG: YES
avcodec: YES (ver 57.107.100)
avformat: YES (ver 57.83.100)
avutil: YES (ver 55.78.100)
swscale: YES (ver 4.8.100)
avresample: NO
GStreamer:
base: YES (ver 1.16.2)
video: YES (ver 1.16.2)
app: YES (ver 1.16.2)
riff: YES (ver 1.16.2)
pbutils: YES (ver 1.16.2)
libv4l/libv4l2: NO
v4l/v4l2: linux/videodev2.h
gPhoto2: YES
Parallel framework: pthreads
Trace: YES (with Intel ITT)
Other third-party libraries:
Intel IPP: 2017.0.3 [2017.0.3]
at: /home/albert/www/dragonfly-installation-linux-2.3/dragonfly-linux/data/dependencies/opencv-3.4.1/build/3rdparty/ippicv/ippicv_lnx
Intel IPP IW: sources (2017.0.3)
at: /home/albert/www/dragonfly-installation-linux-2.3/dragonfly-linux/data/dependencies/opencv-3.4.1/build/3rdparty/ippicv/ippiw_lnx
Lapack: NO
Eigen: YES (ver 3.3.7)
Custom HAL: NO
Protobuf: build (3.5.1)
OpenCL: YES (no extra features)
Include path: /home/albert/www/dragonfly-installation-linux-2.3/dragonfly-linux/data/dependencies/opencv-3.4.1/3rdparty/include/opencl/1.2
Link libraries: Dynamic load
Python (for build): /usr/bin/python2.7
Java:
ant: /bin/ant (ver 1.10.7)
JNI: /usr/lib/jvm/java-1.11.0-openjdk-amd64/include /usr/lib/jvm/java-1.11.0-openjdk-amd64/include/linux /usr/lib/jvm/java-1.11.0-openjdk-amd64/include
Java wrappers: YES
Java tests: YES
Matlab: NO
Install to: /usr/local
-----------------------------------------------------------------
using this basic example to test it:
#include "opencv2/opencv.hpp"
#include <iostream>
using namespace std;
using namespace cv;
int main()
{
// Create video object
VideoCapture cap(0);
cv::Mat frame;
cout<<"Is open: "<<cap.isOpened()<<endl;
cout<<"Opencv version: "<<CV_VERSION<<endl;
cout<<"Buid Information"<<getBuildInformation().c_str()<<endl;
bool is_grabed = cap.grab();
cout<<"is grabed: "<<is_grabed<<endl;
while(true){
cap.read(frame);
cout<<"Frame empty: "<<frame.empty()<<endl;
imshow("frame", frame);
waitKey(1);
}
}
Many thanks!