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• Opencv VideoCapture not streaming RTSP link and returns "no frame !"

  6 septembre 2023, par Asadullah Naeem

  I am trying to stream my HikVision IP camera throough python. I am using cv2.VideoCapture("rtsp_link") which works fine on my Laptop but when I try to run the same python script with same Opencv and FFmpeg version it gives me following error :

  


  Error :

  


  [h264 @ 000002124c7f9a40] missing picture in access unit with size 47
[h264 @ 000002124c7f9a40] no frame!


  


  I have so far tried to run this script on 5 computer devices but it gives the same error. I am using the following python script and my Opencv version is 4.6.0.66 and ffmpeg version 2022-06-20-git-56419428a8-essentials_build-www.gyan.dev :

  


  Python Script :

  


  import cv2

# RTSP stream URL
rtsp_url = "rtsp://username:password@ip_address:port/Streaming/Channels/501"

# Open the RTSP stream
cap = cv2.VideoCapture(rtsp_url)

# Check if the stream was successfully opened
if not cap.isOpened():
    print("Failed to open RTSP stream.")
    exit()

# Read and display frames from the stream
while True:
    # Read a frame from the stream
    ret, frame = cap.read()

    # Check if the frame was successfully read
    if not ret:
        print("Failed to read frame from RTSP stream.")
        break

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

    # Exit if 'q' is pressed
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# Release the resources
cap.release()
cv2.destroyAllWindows()



  


  Update :

  


  Code runs on a laptop on both wifi and mobile internet (4G) but on other devices rtsp link is accessible only with mobile internet (4G).

  


• fatal error : Uncaught exception 'Alchemy\BinaryDriver\Exception\ExecutableNotFoundException' with message 'Executable not found, proposed

  6 septembre 2023, par arvindpundir

  I have installed https://github.com/PHP-FFMpeg/PHP-FFMpeg on linux

  



  hosting path is

  



  /public_html/videoconversion/


  



  I got this error.

  



  Fatal error: Uncaught exception 'Alchemy\BinaryDriver\Exception\ExecutableNotFoundException' with message 
'Executable not found, proposed : 
    public_html/videoconversion/' in 
        /home/deveducate/public_html/videoconversion/vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/AbstractBinary.php:160 Stack trace: 
        #0 /home/deveducate/public_html/videoconversion/vendor/php-ffmpeg/php-ffmpeg/src/FFMpeg/Driver/FFProbeDriver.php(48): 
            Alchemy\BinaryDriver\AbstractBinary::load('public_html/vid...', NULL, Object(Alchemy\BinaryDriver\Configuration)) 
        #1 /home/deveducate/public_html/videoconversion/vendor/php-ffmpeg/php-ffmpeg/src/FFMpeg/FFProbe.php(226): FFMpeg\Driver\FFProbeDriver::create(Array, NULL) 
        #2 /home/deveducate/public_html/videoconversion/vendor/php-ffmpeg/php-ffmpeg/src/FFMpeg/FFMpeg.php(117): FFMpeg\FFProbe::create(Array, NULL, NULL) 
        #3 /home/deveducate/public_html/videoconversion/convert_to_mp4.php(10): FFMpeg\FFMpeg::create(Array, NULL) 
        #4 {main} Next exception 'FFMpeg\Exception\ExecutableNotFoundException' with message 
           'U in /home/deveducate/public_html/videoconversion/vendor/php-ffmpeg/php-ffmpeg/src/FFMpeg/Driver/FFProbeDriver.php on line 50


  



  file

  



  require 'vendor/autoload.php';
$ffmpeg = FFMpeg\FFMpeg::create(array(
'ffmpeg.binaries'  => '/opt/local/ffmpeg/bin/ffmpeg',
'ffprobe.binaries' => '/opt/local/ffmpeg/bin/ffprobe',
'timeout'          => 3600, // The timeout for the underlying process
'ffmpeg.threads'   => 12,   // The number of threads that FFMpeg should 
 use
 ), $logger);
 $video = $ffmpeg->open('video.mpg');
$video
->filters()
->resize(new FFMpeg\Coordinate\Dimension(320, 240))
->synchronize();
$video
->frame(FFMpeg\Coordinate\TimeCode::fromSeconds(10))
->save('frame.jpg');
$video
->save(new FFMpeg\Format\Video\X264(), 'export-x264.mp4')


  



  May any one let me know where to update path.

  



  Thanks

  


• Opencv Videocapture fails to read https url videos

  23 novembre 2020, par Purav Zumkhawala

  I want to read HTTPS URL videos in my Ubuntu system without downloading them. I can do this in windows OS but when I try to run the same code in Ubuntu using the same opencv VideoCapture method it fails to get any frames.

  



  Why is this so ?

  



  I have used same opencv version in both Ubuntu and Windows, can anyone guide me towards a workaround, a tutorial using which I can compile opencv and stream url videos or any other library that supports this functionality in Ubuntu ?

  



  I have tried almost everything but with no productive result which has led me to finally ask this as a question.

  



  opencv build information :

  OpenCV modules:
    To be built:                 calib3d core dnn features2d flann gapi highgui imgcodecs imgproc java_bindings_generator ml objdetect photo python3 python_bindings_generator stitching video videoio
    Disabled:                    world
    Disabled by dependency:      -
    Unavailable:                 java js python2 ts
    Applications:                -
    Documentation:               NO
    Non-free algorithms:         NO

  GUI: 
    QT:                          YES (ver 4.8.7 EDITION = OpenSource)
      QT OpenGL support:         NO
    GTK+:                        NO
    VTK support:                 NO

  Media I/O: 
    ZLib:                        /lib64/libz.so (ver 1.2.3)
    JPEG:                        /opt/libjpeg-turbo/lib64/libjpeg.a (ver 62)
    WEBP:                        build (ver encoder: 0x020e)
    PNG:                         build (ver 1.6.35)
    TIFF:                        build (ver 42 - 4.0.9)
    JPEG 2000:                   build (ver 1.900.1)
    OpenEXR:                     build (ver 1.7.1)
    HDR:                         YES
    SUNRASTER:                   YES
    PXM:                         YES
    PFM:                         YES

  Video I/O:
    DC1394:                      NO
    FFMPEG:                      YES
      avcodec:                   YES (ver 58.21.104)
      avformat:                  YES (ver 58.17.101)
      avutil:                    YES (ver 56.18.102)
      swscale:                   YES (ver 5.2.100)
      avresample:                NO
    GStreamer:                   NO
    v4l/v4l2:                    linux/videodev2.h

  Parallel framework:            pthreads

  Trace:                         YES (with Intel ITT)

  Other third-party libraries:
    Lapack:                      NO
    Eigen:                       NO
    Custom HAL:                  NO
    Protobuf:                    build (3.5.1)

  OpenCL:                        YES (no extra features)
    Include path:                /io/opencv/3rdparty/include/opencl/1.2
    Link libraries:              Dynamic load

  Python 3:
    Interpreter:                 /opt/python/cp36-cp36m/bin/python (ver 3.6.5)
    Libraries:                   libpython3.6m.a (ver 3.6.5)
    numpy:                       /opt/python/cp36-cp36m/lib/python3.6/site-packages/numpy/core/include (ver 1.11.3)
    packages path:               lib/python3.6/site-packages

  Python (for build):            /opt/python/cp36-cp36m/bin/python

  Java:                          
    ant:                         NO
    JNI:                         NO
    Java wrappers:               NO
    Java tests:                  NO

  Install to:                    /io/_skbuild/linux-x86_64-3.6/cmake-install