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• ffmpeg converted file does not open in premiere pro

  26 septembre 2021, par tppt1

  I had to convert mkv files since premiere pro does not support the format. For converting I used following commands to not triple the filesize : ffmpeg -i input.mkv -c:v copy -c:a copy output.mp4

  


  The new file seems to be mp4 but when I import it into Premiere only the audio appears.

  


  Could anyone tell me what I did wrong or what the problem might be ? Or if anyone knows what commands to use without doubling or tripling the file size (since the input files are already about 500-600MiB).

  


  Thanks in advance !

  


• Can't write .mp4 files - Could not open codec 'libx264' : Unspecified error

  17 février 2015, par margaridagomes

  Days ago I installed the latest 2.4 branch withou ffmpeg. I’m using Ubuntu 14.04 and I don’t have at all ffmpeg in my Virtual Machine.

  I want to write .mp4 video files and the input files are also .mp4. The input codec is avc1.

  I can’t obtain any results, the errors can be seen below.

  Error

  [libx264 @ 0x9357bc0] broken ffmpeg default settings detected
  
  [libx264 @ 0x9357bc0] use an encoding preset (e.g. -vpre medium)
  
  [libx264 @ 0x9357bc0] preset usage: -vpre <speed> -vpre <profile>
  
  [libx264 @ 0x9357bc0] speed presets are listed in x264 --help
  
  [libx264 @ 0x9357bc0] profile is optional; x264 defaults to high
  
  Could not open codec 'libx264': Unspecified error
  
  Could not open the output video for write: /home/margarida/exams_2014/Output.mp4
  
  </profile></speed>

  Simplified Code

  int main(int argc, char *argv[]) {
  
              VideoWriter outputVideo;
  
  
  
              // Get Codec Type
  
              int ex = static_cast<int>(cap.get(CV_CAP_PROP_FOURCC));
  
  
  
              // Transform from int to char via Bitwise operators
  
              char EXT[] = { (char) (ex &amp; 0XFF), (char) ((ex &amp; 0XFF00) >> 8),
  
                              (char) ((ex &amp; 0XFF0000) >> 16), (char) ((ex &amp; 0XFF000000)
  
                                      >> 24), 0 };
  
  
  
              // Acquire input size
  
              Size S = Size((int) cap.get(CV_CAP_PROP_FRAME_WIDTH),
  
                              (int) cap.get(CV_CAP_PROP_FRAME_HEIGHT));
  
  
  
              cout &lt;&lt; "Input codec type: " &lt;&lt; EXT &lt;&lt; endl;
  
  
  
              // Open the output
  
              outputVideo.open(newname, ex, cap.get(CV_CAP_PROP_FPS), S, true);
  
  
  
              if (!outputVideo.isOpened()) {
  
                  cout &lt;&lt; "Could not open the output video for write " &lt;&lt; endl;
  
                          return -1;
  
                      }
  
  
  
                      while (true) {
  
                          cap >> frame;
  
                          if (frame.empty()) {
  
                              cerr &lt;&lt; "nao apanhou frame" &lt;&lt; endl;
  
                              break;
  
                          }
  
  
  
                          cinzento = acinzentar(frame);
  
                          imshow("Cinzento", cinzento);
  
  
  
                          outputVideo.write(cinzento);
  
  
  
                          switch(waitKey(10)){
  
  
  
                          case 27:
  
                              //'esc' has been pressed (ASCII value for 'esc' is 27)
  
                              //exit program.
  
                              return 0;
  
  
  
                          }
  
                      }
  
                     return 0;
  
                  }
  
  </int>

  My cmake was this :

  cmake -D WITH_TBB=ON -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON -D WITH_VTK=ON -D WITH_FFMPEG=OFF -D WITH_IPP=OFF ..

  Can anyone help solving my problem ?

  Thanks in advance.

• ffmpeg stop after 1 or 2 hours with error : Cannot read file : Too many open files

  7 juin 2021, par timimi

  When I use drawtext with realod=1, after 1 or 2 hours my ffmpeg stop with error :

  


  [Parsed_drawtext_7 @ 0x563aa3230f00] [FILE @ 0x7fff415ec800] Cannot read file 'myfile.txt': 
Too many open files
[Parsed_drawtext_7 @ 0x563aa3230f00] The text file 'myfile.txt' could not be read or is 
empty
Error while filtering: Too many open files
Failed to inject frame into filter network: Too many open files
Error while processing the decoded data for stream #5:0


  


  I make a bash file that change the file every 3 minutes but I have the same problem.

  


  Thanks for help