Recherche avancée

Sur d’autres sites (13466)

• 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.

• while using opencv in python getting error —>[h264 @ 0x7fd8f4027fc0] error while decoding MB 12 46, bytestream -6 "

  22 janvier 2021, par Himanshu sharma

  I am getting this error —> " [h264 @ 0x7fd8f4027fc0] error while decoding MB 12 46, bytestream -6 "
  
while straming IP camera in python using opencv module.
  
As this error occure, i can't ableenter image description here to save video. You can see this in video enter image description here

  


  Python-> 3.8.5 (default, Jul 28 2020, 12:59:40) [GCC 9.3.0] on linux OS-
Ubuntu - 20.04
OpenCV - 4.4.0
opencv-contrib-python==4.4.0.46

  


  ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
libavutil      56. 31.100 / 56. 31.100
libavcodec     58. 54.100 / 58. 54.100
libavformat    58. 29.100 / 58. 29.100
libavdevice    58.  8.100 / 58.  8.100
libavfilter     7. 57.100 /  7. 57.100
libavresample   4.  0.  0 /  4.  0.  0
libswscale      5.  5.100 /  5.  5.100
libswresample   3.  5.100 /  3.  5.100
libpostproc    55.  5.100 / 55.  5.100
himanshu@himanshu-H81M-S:~$ 


  


• ffmpeg error - unknow error from vkcache m3u8

  18 juillet 2017, par Robert Smith

  Trying to download this stream to mp4 :

  http://f4h4he.vkcache.com/secip/0/Phhz9wn3_IawaUZtvvlVOw/NjguMjQxLjg3LjE1OQ==/1500346800/hls-vod-s1/flv/api/files/videos/2016/03/15/1458006491172bd.mp4.m3u8

  I am using the following command :

  ffmpeg -user-agent "Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us)" -i "http://f4h4he.vkcache.com/secip/0/Phhz9wn3_IawaUZtvvlVOw/NjguMjQxLjg3LjE1OQ==/1500346800/hls-vod-s1/flv/api/files/videos/2016/03/15/1458006491172bd.mp4.m3u8" -vcodec copy -acodec copy -bsf:a aac_adtstoasc output.mp4

  But am getting error from ffmpeg : "Unknown error"

  My question is what am I doing wrong or missing in the command ? Thanks.

  Here is an additional source of help I was using but did not help :

  https://forum.videohelp.com/threads/370243-download-video-from-hqq-tv

  Update #1

  I was able to retrieve the actual file :
  1458006491172bd.mp4.m3u8

  Here is the file :
  http://txt.do/dkyui