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• running the first Qt + ffmpeg profram : undefined reference av_register_all [duplicate]

  20 avril 2016, par Julia

  This question already has an answer here :

  • Adding external library into Qt Creator project
    
    6 answers
    

  I am trying to include ffmpeg in my qt project on windows (I use QT Creator).
  I wrote a small program.

  #include <iostream>
  
  
  
  #ifdef __cplusplus
  
  extern "C" {
  
  #endif
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  #ifdef __cplusplus
  
  }
  
  #endif
  
  
  
  using namespace std;
  
  
  
  int main(int argc, char *argv[])
  
  {
  
  
  
      av_register_all();
  
  
  
      return 0;
  
  }
  
  </iostream>

  And here is the problem

  undefined reference av_register_all

  Please help me to fix it.

• FFMPEG combining MP4 videos with same encoding not working, only showing first video

  13 avril 2020, par Ayudh

  My mp4 videos have the same encoding : h264

  



  I know because I ran this command on them :

  



  ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 a.mp4

  



  Now I combine them using the following command :

  



  ffmpeg -loglevel quiet -f concat -safe 0 -i video-list.txt -c copy video-final.mp4

  



  my video-list.txt file looks like this :

  



  file 'a.mp4'
file 'b.mp4'
file 'c.mp4'


  



  Now the video-final.mp4 which is the combined video actually has duration which is equal to the sum of its' component videos and also is quite larger in size. The issue is that when I play the video, it only plays the first video then stops.

  



  What's going on here ? Any insight would be appreciated.

  



  I've looked at : ffmpeg : Combine/merge multiple mp4 videos not working, output only contains the first video and the answers suggested there are the ones I'm using : specifically, concating from a text file containing the component videos.

  


• ffmpeg not finding my images when trying to create a video from images

  18 juin 2020, par Antsushi

  I have found similar questions on Stackoverflow but none of the answers seem to be working for me. I have images that are named like that :

  



  MP_002_0000.tif
MP_002_0001.tif
MP_002_0002.tif
...
MP_002_0650.tif


  



  I try to create a video by typing the following code into cmd and powershell :

  



  ffmpeg -framerate 24 -i MP_002_%650d.tif output.mp4


  



  But it returns an error that says

  



  Could find no file with path 'MP_002_%650d.tif' and index in the range 0-4
MP_002_%650d.tif: No such file or directory


  



  I then tried the following and I am getting the same error (some of them are probably very silly) :

  



  ffmpeg -framerate 24 -i MP_002_%50d.tif output.mp4
ffmpeg -framerate 24 -i MP_002_%%50d.tif output.mp4
ffmpeg -start_number 0000 -framerate 24 -i MP_002_%%0650d.tif output.mp4
ffmpeg -start_number 0001 -framerate 24 -i MP_002_%%0650d.tif output.mp4


  



  All the images are named in a sequential order and if I try to create a video from only the first 20 images I get the same error. I really am at loss here.