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  • Read H264 streaming from Elp H264 with OpenCV + Pyhton

    15 janvier 2017, par Francesco Paissan

    I’m trying to read an udp streaming of a H264 encoded image. The software structure is like follows :

    On a BeagleBoneBlack (Ubuntu 16.04) I’ve an Elp H264 cam (see here : https://www.amazon.com/ELP-Support-Android-Windows-Surveillance/dp/B00VDSBH9G ). I stream frames with ffmpeg on a Unicast UDP Stream.

    I want to read this images from python and opencv to be able to process them.

    I tried with this simple code to see if the cap is opened or not :

    import cv2
    try:
    
     cap = cv2.VideoCapture("udp://localhost:1234/")
    
    cap.set(CV_CAP_PROP_FOURCC, CV_FOURCC('H', '2', '6', '4'));
    
except Exception, e:
    
    print str(e)

    But when I run this script python says :

    DtsGetHWFeatures : Create File Failed DtsGetHWFeatures : Create File
    Failed Running DIL (3.22.0) Version DtsDeviceOpen : Opening HW in mode
    0 DtsDeviceOpen : Create File Failed libva info : VA-API version 0.38.1
    libva info : va_getDriverName() returns -1 libva error :
    va_getDriverName() failed with unknown libva error,driver_name=(null)
    libva info : VA-API version 0.38.1 libva info : va_getDriverName()
    returns -1 libva error : va_getDriverName() failed with unknown libva
    error,driver_name=(null) libva info : VA-API version 0.38.1 libva info :
    va_getDriverName() returns -1 libva error : va_getDriverName() failed
    with unknown libva error,driver_name=(null) libva info : VA-API version
    0.38.1 libva info : va_getDriverName() returns -1 libva error : va_getDriverName() failed with unknown libva error,driver_name=(null)
    GStreamer Plugin : Embedded video playback halted ; module vaapidecode
    reported : Could not initialize supporting library. OpenCV
    Error : Unspecified error (GStreamer : unable to start pipeline ) in
    cvCaptureFromCAM_GStreamer, file /builddir/build/BUILD/opencv-
    2.4.12.3/modules/highgui/src/cap_gstreamer.cpp, line 816 /builddir/build/BUILD/opencv-2.4.12.3/modules/highgui/src/cap_gstreamer.cpp:816 :
    error : (-2) GStreamer : unable to start pipeline in function
    cvCaptureFromCAM_GStreamer

    Can anybody help me ?

    Thanks,

    Francesco.

  • Read H264 streaming from Elp H264 with OpenCV + Python

    3 février 2017, par Francesco Paissan

    I’m trying to read an udp streaming of a H264 encoded image. The software structure is like follows :

    On a BeagleBoneBlack (Ubuntu 16.04) I’ve an Elp H264 cam (see here : https://www.amazon.com/ELP-Support-Android-Windows-Surveillance/dp/B00VDSBH9G ). I stream frames with ffmpeg on a Unicast UDP Stream.

    I want to read this images from python and opencv to be able to process them.

    I tried with this simple code to see if the cap is opened or not :

    import cv2
    try:
    
     cap = cv2.VideoCapture("udp://localhost:1234/")
    
    cap.set(CV_CAP_PROP_FOURCC, CV_FOURCC('H', '2', '6', '4'));
    
except Exception, e:
    
    print str(e)

    But when I run this script python says :

    DtsGetHWFeatures : Create File Failed DtsGetHWFeatures : Create File
    Failed Running DIL (3.22.0) Version DtsDeviceOpen : Opening HW in mode
    0 DtsDeviceOpen : Create File Failed libva info : VA-API version 0.38.1
    libva info : va_getDriverName() returns -1 libva error :
    va_getDriverName() failed with unknown libva error,driver_name=(null)
    libva info : VA-API version 0.38.1 libva info : va_getDriverName()
    returns -1 libva error : va_getDriverName() failed with unknown libva
    error,driver_name=(null) libva info : VA-API version 0.38.1 libva info :
    va_getDriverName() returns -1 libva error : va_getDriverName() failed
    with unknown libva error,driver_name=(null) libva info : VA-API version
    0.38.1 libva info : va_getDriverName() returns -1 libva error : va_getDriverName() failed with unknown libva error,driver_name=(null)
    GStreamer Plugin : Embedded video playback halted ; module vaapidecode
    reported : Could not initialize supporting library. OpenCV
    Error : Unspecified error (GStreamer : unable to start pipeline ) in
    cvCaptureFromCAM_GStreamer, file /builddir/build/BUILD/opencv-
    2.4.12.3/modules/highgui/src/cap_gstreamer.cpp, line 816 /builddir/build/BUILD/opencv-2.4.12.3/modules/highgui/src/cap_gstreamer.cpp:816 :
    error : (-2) GStreamer : unable to start pipeline in function
    cvCaptureFromCAM_GStreamer

    Can anybody help me ?

    Thanks,

    Francesco.

  • FFmpeg os.system commands not working but work in Terminal

    28 janvier 2020, par Oscar Dolloway

    I’ve downloaded ffmpeg through the website and ran some commands through the terminal to confirm its install.

    when running the command ’ffmpeg’ in the Terminal it returns

     ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg 
    
 developers
    
 built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)

    if i type into Python

    import os
    
os.system ('ffmpeg')

    it returns

     os.system ('ffmpeg')
    
 sh: ffmpeg: command not found
    
 Out[25]: 32512

    any ideas ?

    Solution :

     ffmpeg = '/bin/ffmpeg' #path to the binary file
    

    
 os.system(ffmpeg)

    Output :

    os.system (ffmpeg)
    
ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
    
built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)

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