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  • OpenCV VideoCapture timeout on Open or Constructor ?

    18 novembre 2016, par Robert

    OpenCV has the VideoCapture class to load video from external sources. I have a network camera on my network that I’m accessing with RTSP (using the FFMPEG plugin).

    The sad thing is that it seems the open method and the constructor block on opening the video stream. This means if the stream is down, the program is stuck there forever.

    Is there any sort of timeout ability ? I tried looking in the source code, but in the end it calls external FFMPEG functions I believe and I’m unable to go further.

    If there isn’t timeout, is there any sort of library for a nonblocking VideoCapture method for RTSP or HTTP ?

  • Pre-announcement : Piwik Marketplace soon open for paid premium features

    12 octobre 2016, par Piwik Core Team — Community

    Updates : Premium Plugins now available on the Piwik Analytics Marketplace. Further announcements about premium plugins : 1) Powerful Video Analytics and Audio Analytics and 2) A/B Testing Platform for Piwik Analytics.

    The goal of the Piwik project is to build the best open digital analytics platform that lets you measure what matters to you while giving you full control of your data. The beauty of the Piwik Analytics platform is that it can be customized and extended by building or installing new features on top of the Piwik core.

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    Get more out of your Piwik

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    1-click installation and update

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    Sell your plugins on the Piwik Marketplace

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  • OpenCV-C++ VideoCapture fails to open video files

    2 novembre 2016, par Akihiko

    Recently I upgraded my OS from Ubuntu Precise Saucy (13.10) to Trusty (14.04). After this upgrade, cv::VideoCapture became not working properly. The program aborts when reading a video file. For example,

    int main(int argc, char**argv)
    
{
    
  cv::VideoCapture vin("sample/vout2l.avi");
    
...

    Executing this program, it aborts with a message :

    *** Error in `./cv2-videoread.out': malloc(): memory corruption: 0x0000000000e3eff0 ***
    
Abort (core dumped)

    The backtrace looks like :

    [New LWP 15586]
    
[New LWP 15587]
    
[Thread debugging using libthread_db enabled]
    
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
    
Core was generated by `./cv2-videoread.out'.
    
Program terminated with signal SIGABRT, Aborted.
    
#0  0x00007ff953e61c37 in raise () from /lib/x86_64-linux-gnu/libc.so.6
    
(gdb) bt
    
#0  0x00007ff953e61c37 in raise () from /lib/x86_64-linux-gnu/libc.so.6
    
#1  0x00007ff953e65028 in abort () from /lib/x86_64-linux-gnu/libc.so.6
    
#2  0x00007ff953e9e2a4 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
    
#3  0x00007ff953eabe26 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
    
#4  0x00007ff953eac1ab in ?? () from /lib/x86_64-linux-gnu/libc.so.6
    
#5  0x00007ff953eadba4 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
    
#6  0x00007ff953eaf7d2 in posix_memalign () from /lib/x86_64-linux-gnu/libc.so.6
    
#7  0x00007ff94fa640fe in av_malloc () from /usr/lib/x86_64-linux-gnu/libavutil.so.52
    
#8  0x00007ff94fa641b1 in av_strdup () from /usr/lib/x86_64-linux-gnu/libavutil.so.52
    
#9  0x00007ff94fa5e5db in av_dict_set ()
    
  from /usr/lib/x86_64-linux-gnu/libavutil.so.52
    
#10 0x00007ff954738574 in CvCapture_FFMPEG::open(char const*) ()
    
  from /usr/lib/libopencv_highgui.so.2.4
    
#11 0x00007ff954738719 in cvCreateFileCapture_FFMPEG ()
    
  from /usr/lib/libopencv_highgui.so.2.4
    
#12 0x00007ff95473aac9 in cvCreateFileCapture_FFMPEG_proxy(char const*) ()
    
  from /usr/lib/libopencv_highgui.so.2.4
    
---Type <return> to continue, or q <return> to quit---
    
#13 0x00007ff954722d89 in cvCreateFileCapture ()
    
  from /usr/lib/libopencv_highgui.so.2.4
    
#14 0x00007ff954723045 in cv::VideoCapture::open(std::string const&amp;) ()
    
  from /usr/lib/libopencv_highgui.so.2.4
    
#15 0x00007ff95472315c in cv::VideoCapture::VideoCapture(std::string const&amp;) ()
    
  from /usr/lib/libopencv_highgui.so.2.4
    
#16 0x0000000000401281 in main (argc=1, argv=0x7fff1f938388) at cv2-videoread.cpp:30
    
(gdb)
    
</return></return>

    NOTE : cv::VideoCapture vin(... is 30th line.

    Before upgrading the OS, this code was working with the same input file.

    From the backtrace, it seems that the trouble happens at CvCapture_FFMPEG and libavutil. I upgraded the packages ffmpeg libavutil-dev libavutil51 libavutil52 but they were already up-to-date.
    Also, OpenCV packages are up-to-date (I checked libopencv-core-dev libopencv-core2.4 libopencv-dev libopencv-highgui-dev libopencv-highgui2.4).

    I also tested OpenCV built from source, but got the same results.

    Do you have ideas to figure this out ?

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