# Build in jetson nano motherboard using source opencv found that call in python3 cv2 library reading video cannot receive video frame of data. (opencv4.8.0))

**URL:** <https://forum.opencv.org/t/build-in-jetson-nano-motherboard-using-source-opencv-found-that-call-in-python3-cv2-library-reading-video-cannot-receive-video-frame-of-data-opencv4-8-0/14326>\
**Category:** Uncategorized\
**Tags:** gstreamer, nvidia\
**Created:** [August 23, 2023, 6:02am UTC](https://forum.opencv.org/t/build-in-jetson-nano-motherboard-using-source-opencv-found-that-call-in-python3-cv2-library-reading-video-cannot-receive-video-frame-of-data-opencv4-8-0/14326 "2023-08-23T06:02:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![capricom](https://avatars.discourse-cdn.com/v4/letter/c/bbe5ce/32.png) [@capricom](https://forum.opencv.org/u/capricom)\
**Post date:** [August 23, 2023, 6:02am UTC](https://forum.opencv.org/t/build-in-jetson-nano-motherboard-using-source-opencv-found-that-call-in-python3-cv2-library-reading-video-cannot-receive-video-frame-of-data-opencv4-8-0/14326/1 "2023-08-23T06:02:22Z")

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After I downloaded the source code of **opencv-4.8.0 on github（and opencv\_opencv\_contrib-4.8.0）** , I compiled it manually. The compilation parameters are as follows:

```auto
cmake -D BUILD_opencv_python3=ON
-D BUILD_opencv_python2=OFF
-D CMAKE_INSTALL_PREFIX=/usr/local
-D WITH_FFMPEG=1
-D CUDA_ARCH_BIN=5.3
-D WITH_CUDA=1
-D ENABLE_FAST_MATH=1
-D CUDA_FAST_MATH=1
-D WITH_CUBLAS=1
-D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-4.8.0/modules..

```

After the compilation is successful, `make install` is performed. After the operation is completed, I enter python3 and enter `import cv2` in the python terminal, and it prompts me that the library cannot be found.  
But I can successfully import the cv2 library by entering `import cv2` under the `/opencv/opencv-4.8.0/build/python_loader` path.  
Then I conducted a simple loading video test, the code is as follows:

root@concotianqi-desktop:/home/concotianqi/opencv/opencv-4.8.0/build/python\_loader# python3  
Python 3.6.9 (default, Mar 10 2023, 16:46:00)  
[GCC 8.4.0] on linux  
Type “help”, “copyright”, “credits” or “license” for more information.

> > > import cv2  
> > > x = cv2.VideoCapture(“2.avi”)  
> > > Opening in BLOCKING MODE  
> > > Opening in BLOCKING MODE  
> > > NvMMLiteOpen : Block : BlockType = 260  
> > > NVMEDIA: Reading vendor.tegra.display-size : status: 6  
> > > NvMMLiteBlockCreate : Block : BlockType = 260  
> > > [WARN:0@11.588] global cap\_gstreamer.cpp:2785 handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module avidemux0 reported: Internal data stream error.  
> > > [WARN:0@11.601] global cap\_gstreamer.cpp:1679 open OpenCV | GStreamer warning: unable to start pipeline  
> > > [WARN:0@11.602] global cap\_gstreamer.cpp:1164 isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created  
> > > x. read()  
> > > (False, None)

It can be seen that the video frame data cannot be successfully read. It is known that the video is lossless after completion, and the video frame data can be successfully read using the same code on other computers. What is going on here, and how can I go about it? Solved, thanks. Bothered me for a long time.