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• Latency and frame break using Hikvison using OpenCV

  24 septembre 2024, par Arjun Mani

  When I try reading frames from Hikvision camera, I face latency and frame break, from OpenCV, but it works fine with ffmpeg, and if I use any other camera, like axis, it works, fine but in Hikvision, I have some issue, so if someone has solved this issue, can please share me to solve

  


  I need to resolve this issue.

  


  import cv2

  


  import cv2

# RTSP URL
rtsp_url = "rtsp://admin:okulr123@192.168.0.64:554/Streamings/channels/101"

# Create a VideoCapture object
cap = cv2.VideoCapture(rtsp_url)

# Check if the connection is opened
if not cap.isOpened():
    print("Error: Couldn't open the video stream")
    exit()

# Read frames in a loop
while True:
    ret, frame = cap.read()

    # Check if frame was successfully captured
    if not ret:
        print("Error: Couldn't read frame")
        break

    # Display the frame
    cv2.imshow('RTSP Stream', frame)

    # Break the loop if 'q' key is pressed
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# Release the VideoCapture object and close windows
cap.release()
cv2.destroyAllWindows()



  


• include/c++/4.6.3/bits/stl_algobase.h:329 : undefined reference to

  27 novembre 2013, par user3041105

  My program is fails to compile with this error when I use my own account but when use the root account it compiles successfully. I have installed boost, ffmpeg and opencv.

  The errors are as follows :

  === linking: release/DenseTrack ===
  
   g++ -L/opt/lib -L/home/huangng/software/boost/lib -L/home/huangng/software/opencv/lib -L/home/huangng/software/ffmpeg/lib -pipe -Wall -O3 -ggdb -o release/DenseTrack .build_release/DenseTrack.o -lboost_program_options -lboost_regex -lboost_system -lboost_filesystem -lopencv_core -lopencv_highgui -lopencv_video -lopencv_imgproc -lavformat -lavdevice -lavutil -lavcodec -lswscale
  
   .build_release/DenseTrack.o: In function `main':
  
   /home/huangng/lab/dense_trajectory_release_v1.1/DenseTrack.cpp:103: undefined reference to `IplImagePyramid::rebuild(IplImageWrapper)'
  
   /home/huangng/lab/dense_trajectory_release_v1.1/DenseTrack.cpp:307: undefined reference to `IplImagePyramid::rebuild(IplImageWrapper)'
  
   /home/huangng/lab/dense_trajectory_release_v1.1/DenseTrack.cpp:56: undefined reference to `IplImageWrapper::operator=(IplImageWrapper const&)'
  
   /home/huangng/lab/dense_trajectory_release_v1.1/DenseTrack.cpp:58: undefined reference to `IplImageWrapper::operator=(IplImageWrapper const&)'
  
   /home/huangng/lab/dense_trajectory_release_v1.1/DenseTrack.cpp:60: undefined reference to `IplImageWrapper::operator=(IplImageWrapper const&)'
  
   /home/huangng/lab/dense_trajectory_release_v1.1/DenseTrack.cpp:62: undefined reference to `IplImageWrapper::operator=(IplImageWrapper const&)'
  
   /home/huangng/lab/dense_trajectory_release_v1.1/DenseTrack.cpp:68: undefined reference to `IplImagePyramid::rebuild(IplImageWrapper)'
  
   .build_release/DenseTrack.o: In function `IplImagePyramid':
  
   /home/huangng/lab/dense_trajectory_release_v1.1/./opencv/IplImagePyramid.hpp:34: undefined reference to `IplImagePyramid::init(CvSize, int, int, double)'
  
   .build_release/DenseTrack.o: In function `__copy_m<const>&#39;:
  
   /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_algobase.h:343: undefined reference to `IplImageWrapper::operator=(IplImageWrapper const&amp;)&#39;
  
   .build_release/DenseTrack.o: In function `__copy_m&#39;:
  
   /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_algobase.h:343: undefined reference to `IplImageWrapper::operator=(IplImageWrapper const&amp;)&#39;
  
   collect2: ld returned 1 exit status
  
   make: *** [release/DenseTrack] Error 1
  
  </const>

• Including the switch "-hls_flags temp_files" while encoding to HLS does nothing

  24 juillet 2019, par cloudhorn

  I’m trying to disable access to video segment files while they are still being converted. This is to stop my web-page from loading the unfinished segments.

  One solution that appeals to me is using the ’-hls_flags temp_files’ option that (according to the docs) initiates segments with the name ’filename.tmp’, and renames them only once the segment is complete. This is opposed to the standard ffmpeg behaviour where unfinished segments have the same name as the completed ones.

  Problem is I can’t get ’-hls_flags temp_files’ to do anything. Converting a video with :

  ffmpeg -i aerial.mov -g 60 -keyint_min 60 -sc_threshold 0 -f HLF -hls_time 2 -hls_list_size 0 -hls_flags temp_file aerial.m3u8

  produces the exact same output as running the same command line without ’-hls_flags temp_file’. Does anyone have experience using ’temp_file’ ?

  EDIT : Issue was solved by getting a static git build of ffmpeg, instead of the latest (4.1.1) release build I had, as pointed out by user Gyan :

  Micro version of release should be ignored. git master is branched off for minor and major bumps. Minor upgrades only have security fixes for the most part. Get a static git build. Get one from the left column at johnvansickle.com/ffmpeg