Questions tagged [opencv]
64
questions
1
vote
0
answers
819
views
avoid duplicate frames in ffmpeg
I have a video.mp4 which I need to convert losslessly into a sequence of images.
I used
ffmpeg -i input.mp4 $filename%05d.tiff
but I get a lot (thousands) of duplicated frames. What are they? is it ...
- 15
0
votes
1
answer
325
views
Java folder missing from openCV installation with homebrew
On my old MacBook Pro mid 2012 I was able to easily install openCV 4.5.2 with homebrew. After installation I had a java folder with a dylib file and a jar.
Now I bought a MacBook Pro M2 2022, ...
- 1
0
votes
0
answers
61
views
Ffmpeg is not working in Nvidia Tesla V100. Not able to read rtsp stream
RTSP stream is not accessible in NVIDIA Tesla V100 machine. I have tried to access inside docker container also, getting same error. Same docker is working in other GPU machine NVIDIA Quardo P1000 and ...
1
vote
0
answers
119
views
How can I use "mestimate" for detection of a new object from a live video feed?
I read that I can use motion vectors to detect new objects in a scene as a form of motion detection.
FFMPEG doesn't have motion detection implementation but I can use "mestimate" which uses ...
- 49
0
votes
0
answers
2k
views
FFmpeg live streaming to ffserver delay at start
I'm trying to achieve a simple camera streaming using FFMpeg and FFserver. I have two slightly different systems acting as source, both Debian OS:
the first one runs ffmpeg 3.4.8, as indicated in ...
1
vote
0
answers
560
views
cv2.cuda.getCudaEnabledDeviceCount() return 0 after visual studio build and with_cuda is set true for opencv using windows10
I want gpu to work in opencv , after CMake with_cuda true and build of (ALL_Build, Install) with no errors
I found GPU not detected
I use windows 10 I tried 3 times to build opencv , but Gpu not work ...
- 111
1
vote
0
answers
17
views
Customize Alternate Control Methods(Face recognition) to control mouseclick in macOS?
In macOS Accessibility , there is a section called Pointer Control, and in 'Alternate Control Methods', I can use Raise Eyebrows to perform a left click, So I wanna ask, Is there any way to customize ...
- 145
0
votes
1
answer
182
views
Stitching with large Parallax
I need to stitch images of 5 cameras together. The cameras are mounted on the sides of an underwater remote operated vehicle. It's basicly a cupoid with sizes of 2.1m x 1.3m x 1.85m. The cameras are ...
- 1
1
vote
0
answers
146
views
Bandwidth Concerns for 2 Webcams and an Arduino in a USB Hub
I'm working on a robotics project using an Arduino and two Logitech C920 Pro webcams.
I'm trying to keep everything nice and tidy so I thought I could connect the Arduino and the two C920s to a ...
- 11
1
vote
0
answers
287
views
Solution to open a windows server multiple GUI session for same user
I am working on a Computer vision application. which launches an application on a remote server and navigates through GUI application to check if it's working fine.
How I do it now is I installed my ...
- 111
0
votes
1
answer
773
views
Displaying UDP Multicast Rawvideo Stream
I have a problem while trying to capture the raw video over UDP.
In my setup, I stream the webcam with FFmpeg (command line) via UDP, on the client side I use Java OpenCV, the capture line; ...
- 11
1
vote
0
answers
242
views
How do I run OpenCV apps remotely (thru VNC/RDP)?
What I want to accomplish: For my coursework I require to compile and execute OpenCV programs. It's all well, I installed the OpenCV library into the remote Debian server and compiled my first test ...
- 363
0
votes
0
answers
2k
views
MacOS Mojave | PyCharm Is not allowed to access to the camera
I am trying to execute the following code:
import cv2
video_capture = cv2.VideoCapture(0)
print('Camera initialized')
ret, raw_frame = video_capture.read()
video_capture.release()
print('Bye!')
...
- 101
0
votes
0
answers
405
views
Raspbian openVINO - no module named 'cv2'
I have been configuring openVINO on my Raspberry pi 2 B, and followed these instructions.
I was successfully able to run the "object_detection_sample_ssd" demonstration, but that is where my luck ...
- 21
1
vote
0
answers
4k
views
Anaconda Prompt Stuck on "downloading and extracting packages" specifically for Wheel-0.33.4
I was trying to install opencv following instructions from https://www.learnopencv.com/install-opencv-3-and-dlib-on-windows-python-only/
It identified some packages that needed to be installed and ...
1
vote
0
answers
332
views
opnecv4.pc missing file and gocv
I am trying to make this code to work:
package main
import (
"gocv.io/x/gocv"
)
func main() {
webcam, _ := gocv.VideoCaptureDevice(0)
window := gocv.NewWindow("Hello")
img := gocv....
- 111
1
vote
1
answer
2k
views
installed Opencv 4.1.1 from source over 3.4.3, and C++ headers are not linking correctly
I jusst installed Opencv 4.1.1 from source, with python 3 bindings. My Python installation seems to work correctly, because if I run:
import cv2
cv2.__version__
I get '4.1.1'
However, I also want ...
- 41
4
votes
1
answer
4k
views
25% of my .mp4 have "error reading header" in FFMPEG, OpenCV - but videos all play fine
I've got a Reolink security camera, which saved .mp4 files via FTP to a local server. I've then got my own Python-based application processing those videos. It's been working fine for the past year ...
- 143
0
votes
1
answer
2k
views
Why does OpenCV+GStreamer lags exactly two seconds behind real time?
I'm trying to capture live feed through an h264 camera on RTSP protocol. On a terminal, the following gst-launch-1.0 command gives almost real-time feed:
gst-launch-1.0 playbin uri=rtsp://IP:PORT/...
- 1
0
votes
0
answers
100
views
Way to record the last n minute from webcam
I try to use or create a software to record the last n minutes from a webcam.
I use opencv to grab images from my webcam but I don't know if it is the best way to create a in real time a video. I ...
- 11
1
vote
0
answers
605
views
(no-answer) How do I merge videos that have overlapping frames into a video without duplicate frames?
I've nvidia highlights that takes 3 minutes recordings when events happen. If two events happen sooner than 3 minutes then those recorded clips have overlapping frames. I want to take all the clips ...
- 336
1
vote
2
answers
5k
views
OpenCV Failed Compilation "Eigen/Core: No such file or directory" -- Cannot Change CMake Entry
I'm trying to install OpenCV but when I try to compile using CMake, I always get the error stated in the question, usually around 4% - 6%.
[ 6%] Building CXX object modules/core/CMakeFiles
/...
0
votes
2
answers
2k
views
Error 'tesseract/baseapi.h' file not found when building opencv from source on macos
I am building opencv 4.1.0 from source on mojave and it gets to 54% before dying with the stated error:
/git/opencv-4.1.0/opencv_contrib/modules/text/src/precomp.hpp:54:10:
fatal error: 'tesseract/...
- 3,485
1
vote
0
answers
444
views
Compiler errors when building opencv from source on macos
I am trying to build OpenCV 4.1.0 on Mac by following this blog: https://www.learnopencv.com/install-opencv-4-on-macos/
Here is the command line for the preparatory cmake - which is successful:
...
- 3,485
0
votes
1
answer
574
views
anaconda opencv python version different from anaconda python version
(base) C:\Users\Aspire 5>python
Python 3.6.4 |Anaconda, Inc.| (default, Jan 16 2018, 10:22:32) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more ...
- 1
0
votes
0
answers
248
views
Having Trouble installing dependencies for OpenCV on RPi
for some reason, when i run the code below i get the following error. what should i do? I'm trying to install opencv for python 3.
sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev ...
0
votes
0
answers
147
views
How can I speed up laptop internal webcam capture in Ubuntu 18.04 vs Windows 10?
I am writing C++/opencv code for some image processing routines, and am using my Dell Precision 7730's own webcamera to get test video input. Video card is Quadro P5200.
I started in Windows 10 ...
- 1
0
votes
1
answer
793
views
Real time video recording frames processing
Recently I have been working on an Android camera with lots of features using camera2 and OpenCV, and now I want to record a video with custom resolution, for example if my device support 1920×1080 ...
0
votes
1
answer
1k
views
Anaconda OpenCV import error
I am currently using conda version 4.6.14 with python 3.7.3, I successfully installed OpenCV in the anaconda shell using conda install -c conda-forge opencv but when I run python in the shell and type ...
- 1
1
vote
1
answer
4k
views
Import OpenCV module to Android Studio blocked by "Nothing to Show"
I'm trying to use OpenCV in an AndroidStudio to start creating an application that will be processing images from the camera.
In short, I setup a new Android Studio project based on Java code and ...
- 13
0
votes
0
answers
246
views
Intel RealSense Camera R200 video feed is all green
I am trying to get an Intel Realsense R200 camera working on a Windows 10 machine using Python 3.7.3 and OpenCV 4.1.0. The problem is that when I open the application the video feed is all green ...
1
vote
2
answers
15k
views
Error installing dlib on Pycharm
I am trying to install dlib on Pycharm (which is similar to Anaconda) in order to use it for my Python and OpenCV face detection project.
I have installed cMake and upgraded Python but there is ...
- 11
1
vote
0
answers
111
views
OpenCV install stuck on cmake
I'm currently in the middle of installing openCV3 on my raspberry pi3. The pi is a clean install of NOOBS Raspbian and I'm using this PyImageSearch install guide: https://www.pyimagesearch.com/2016/04/...
- 11
0
votes
1
answer
338
views
Error while integrating OpenCV in Android Studio (color.xml, content not allowed in prolog)
I have been trying to integrate/use OpenCV in Android Studio. But I keep getting stuck with this error.
C:\AndroidStudioProjects\IntegrateOpenCV341\app\src\main\res\values\colors.xml:1:1: Error: ...
- 1
2
votes
2
answers
1k
views
Accessing Macbook Webcam on Ubuntu via VMWare Fusion
I am writing a program in C++ using opencv. I am working on Ubuntu via VMWare Fusion.
When I run my program, it seems the integrated webcam on my Mac is not recognized so I get the error message I ...
- 21
0
votes
1
answer
51
views
How to install any latest version of any c/c++ library over an old one
I want to install the latest version of OpenCV on my linux distro [ Kali ] i.e OpenCV 4.0.1 over OpenCV 3.4.3 . Will there be any problems if I directly install OpenCV 4.0.1 ? Just to make this ...
1
vote
0
answers
378
views
OpenCV with Gstreamer installation...possible?
I have some Python code which utilizes OpenCV in a way to use Gstreamer pipelines in lieu of a webcam or video file as input to a 'Videocapture' command...for a simple example:
send = cv2....
- 121
2
votes
2
answers
3k
views
OpenVINO installation on Raspbian - usbboot.rules file issue
I am attempting to install OpenVINO on my Raspberry Pi 3 B+ to use the Neural Compute Stick 2. They just recently released support for this and I am following the installation instructions here:
https:...
- 23
1
vote
0
answers
1k
views
Run OpenCV commands on command Prompt
I am completely new to doing these things, so please bear with me.
To learn more about using OpenCV, I installed it with pip for python 3.6.5.
This worked fine at first, but eventually, I started ...
- 43
3
votes
0
answers
1k
views
stitch multiple microscope images using python [closed]
I'm trying to stitch a scan of a large area made using a microscope but I'm not having a whole lot of luck.
I started testing with 3 images extracted from a scanning video.
I stitched each 2 matching ...
1
vote
1
answer
2k
views
opencv_core245.dll & opencv_ml245.dll missing
I'm trying to install some important software related to my work (on Windows 10), but when I try to run it an error pops up saying that opencv_core245.dll & opencv_ml245.dll are missing.
I have ...
- 143
1
vote
1
answer
3k
views
Low latency video shared in local gigabit network using linux
For a robotics task we need to share the video (Webcam) live to about 6 or 7 users in the same room. OpenCV will be used on the clients to read the situation and send new tasks to the robots. Latency ...
- 63
1
vote
1
answer
102
views
Audiovisual content looses synchronization
I have a .mp4 video file which came from an uncompressed .avi captured from a webcam through emgu. The emgu videoWriter is set to 30fps even the real video fps is possibly lower, e.g., 29fps. The ...
- 111
0
votes
0
answers
542
views
CUDA compilation inOpenCV in Arch Linux
I'm trying to compile programs in OpenCV 3.2.0 with CUDA, I have a Graphic Card Nvidia Gforce 950M (Maxwell) and I use Arch Linux
First of all, I had installed on Arch Linux X64 and the lastest ...
1
vote
0
answers
117
views
Merging two videos while skipping common parts
A customer has a collection of tutorial videos, all of which have the following structure:
preview (or recap)
intro (always identical)
repeated part from previous video (optional)
new content
outro
...
- 111
1
vote
0
answers
64
views
Setting up stereo cameras
I am about to set up stereo cameras, and use OpenCV for real-time image and depth processing, the last time I tried, I have bought a pair of uncompressed cameras which the problems like this and this ...
- 111
1
vote
2
answers
846
views
gtk_widget_set_realized was not declared in this scope
I'm trying to compile OpenCV 3.1.0 on RHEL 6.4 and getting the following error:
[ 34%] Building CXX object modules/highgui/CMakeFiles/opencv_highgui.dir/src/window_gtk.cpp.o
/hpcf/libs/opencv/vendor/...
- 1,476
1
vote
1
answer
3k
views
OpenCV: ImportError: libavcodec.so.54
I am using Ubuntu, and whenever I try to import cv2 to python I get the following error:
ImportError: libavcodec.so.54: cannot open shared object file: No such file or directory
I looked online ...
- 231
0
votes
1
answer
1k
views
Visual Studio deletes my CMake.exe
I'm installing OpenCV from this [very out of date] tutorial.
I made it through the configuration step and everything seemed fine, but then when I try to build the OpenCV.sln, I get a bunch of these ...
- 111
8
votes
3
answers
27k
views
Install OpenCV in CentOS
I am trying to install OpenCV in CentOS 6. When I run the command
[root@cosmas opt]# sudo yum install libtiff4-dev libjpeg-dev libjasper-dev
it returned the follow:
Loaded plugins: fastestmirror, ...
- 81