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• Adding 'timeout' flag to ffprobe/ffmpeg causes it to fail immediately

  15 mai 2021, par user779159

  If I run ffprobe -timeout 20 -v trace -print_format json -show_format -show_streams 'http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_2mb.mp4', the command fails immediately with a Connection timed out error even though I set the timeout to 20 seconds. It doesn't wait anywhere near 20 seconds, just exits right away with an exit code of 1. Here's the trace output.

  



  ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers
  built with gcc 6.2.1 (GCC) 20160830
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-netcdf --enable-shared --enable-version3 --enable-x11grab
  libavutil      55. 34.100 / 55. 34.100
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.100 / 57. 56.100
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libavresample   3.  1.  0 /  3.  1.  0
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
{
[http @ 0x5598e7df1e20] Setting default whitelist 'http,https,tls,rtp,tcp,udp,crypto,httpproxy'
[http @ 0x5598e7df1e20] request: GET /video/mp4/720/big_buck_bunny_720p_2mb.mp4 HTTP/1.1
User-Agent: Lavf/57.56.100
Accept: */*
Range: bytes=0-
Connection: close
Host: www.sample-videos.com
Icy-MetaData: 1


http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_2mb.mp4: Connection timed out

}


  



  If I remove the -timeout 20 flag the command works fine. How can I get ffprobe to work with timeouts ?

  


• Adding 'timeout' flag to ffprobe/ffmpeg causes it to fail immediately

  23 janvier 2017, par user779159

  If I run ffprobe -timeout 20 -v trace -print_format json -show_format -show_streams 'http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_2mb.mp4', the command fails immediately with a Connection timed out error even though I set the timeout to 20 seconds. It doesn’t wait anywhere near 20 seconds, just exits right away with an exit code of 1. Here’s the trace output.

  ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers
  
    built with gcc 6.2.1 (GCC) 20160830
  
    configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-netcdf --enable-shared --enable-version3 --enable-x11grab
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  {
  
  [http @ 0x5598e7df1e20] Setting default whitelist 'http,https,tls,rtp,tcp,udp,crypto,httpproxy'
  
  [http @ 0x5598e7df1e20] request: GET /video/mp4/720/big_buck_bunny_720p_2mb.mp4 HTTP/1.1
  
  User-Agent: Lavf/57.56.100
  
  Accept: */*
  
  Range: bytes=0-
  
  Connection: close
  
  Host: www.sample-videos.com
  
  Icy-MetaData: 1
  
  
  
  
  
  http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_2mb.mp4: Connection timed out
  
  
  
  }

  If I remove the -timeout 20 flag the command works fine. How can I get ffprobe to work with timeouts ?

• Videocapture error : Assertion desc failed at src/libswscale/swscale_internal.h:668 error

  1er février 2019, par Alejandro Silvestri

  Videocapture read give me this error. It started recently when I updated to opencv4. No errors on opencv4 installation. libswscale is up to date, I have libswscale.so.4.8.100.

  The code is a simple "open" and "read" video to isolate the problem :

  #include<opencv2></opencv2>core.hpp>
  
  #include<opencv2></opencv2>videoio.hpp>
  
  #include<opencv2></opencv2>highgui/highgui.hpp>
  
  #include<string>
  
  #include <iostream>
  
  
  
  int main(int argc, char **argv){
  
      cv::VideoCapture video;
  
      std::string filename(argv[1]);
  
      std::cout &lt;&lt; "filename " &lt;&lt; filename &lt;&lt; std::endl;
  
      std::cout &lt;&lt; "video.open " &lt;&lt; video.open(filename) &lt;&lt; std::endl;
  
      union {
  
          char ch[5] = {0};
  
          int i4cc;
  
      } fourcc;
  
      fourcc.i4cc = (int) video.get(cv::CAP_PROP_FOURCC);
  
      std::cout &lt;&lt; "Fourcc " &lt;&lt; fourcc.ch &lt;&lt; std::endl;
  
      cv::Mat frame;
  
      while(true){
  
          std::cout &lt;&lt; "video.read " &lt;&lt; video.read(frame) &lt;&lt; ", Mat.rows " &lt;&lt; frame.rows &lt;&lt; std::endl;
  
          cv::imshow("imagen", frame);
  
      }
  
  }
  
  </iostream></string>

  The output is this

  filename ../Archivos/Vuelta al Lab Uno 720p.MP4
  
  video.open 1
  
  Fourcc avc1
  
  Assertion desc failed at src/libswscale/swscale_internal.h:668

  VideoCapture opens the video file, shows fourcc property, and then fails to read first image.

  If you ask, video file is fine, I tried with other video files and other video formats, with the same error. These videos play well with ffmpeg.ffplay !

  By the way, VideoCapture.read is working fine with webcam. So, it’s not clear where the problem is.

  Thank you for your time.