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• FFMPEG/libavfilter drawtext scaling without affecting video [duplicate]

  23 avril 2019, par Captain Jack

  This question already has an answer here :

  • Overlaying text on video with required angle using FFMPEG
    
    2 answers
    

  How can I scale drawtext without affecting the input video ?

  Here’s my attempt - this filter is applied in C but is equivalent to -filter_complex in command line.

  [in]drawtext=text='Test Text': fontcolor=white: fontsize=w/40: x=w/20: y=h*16/18:shadowx=1:shadowy=1,scale=iw/2:ih/3[out]

  The above does scale text but it also affects video as it’s part of the drawtext input.

  I tried things like :

  nullsrc=s=iwxih[ns];
  
  [ns]drawtext=text='Test Text': fontcolor=white: fontsize=w/40: x=w/20: y=h*16/18:shadowx=1:shadowy=1,scale=iw/2:ih/3[text];
  
  [in][text]overlay=0:0[out]

  But it doesn’t seem to like nullsrc and it hangs... or I am doing something wrong.

  Any ideas ?

• OpenCV Installation error in ubunt, stuck on compilation [duplicate]

  11 novembre 2014, par Deepak Eevil Personified

  This question already has an answer here :

  • What is an undefined reference/unresolved external symbol error and how do I fix it ?
    
    14 answers
    

  When I try to install opencv in ubuntu 9.1 Karmic Koala,I know it is a older version. I encounter with the following error while compiling(Using Make)

  I have installed all the new versions of FFMPEG and other utilities, Still I am unable to install opencv

  [ 19%] Built target pch_Generate_opencv_perf_core
  
  
  
  Linking CXX executable ../../bin/opencv_perf_core
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `swr_free'
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `swr_init'
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `swr_is_initialized'
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `swr_close'
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `swr_convert'
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `swr_alloc'
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `cvCreateCameraCapture_V4L(int)'
  
  
  
  collect2: ld returned 1 exit status
  
  
  
  make[2]: *** [bin/opencv_perf_core] Error 1
  
  
  
  make[1]: *** [modules/core/CMakeFiles/opencv_perf_core.dir/all] Error 2
  
  
  
  make: *** [all] Error 2

  If some body can help with this, it will be greatfull

  Thanks in advance

• IOException when I use Runtime for FFMPEG [duplicate]

  20 octobre 2016, par Kilobyte

  This question already has an answer here :

  • Why do I get “Exception ; must be caught or declared to be thrown” when I try to compile my Java code ?
    
    6 answers
    

  I’m trying to write a java program that converts a video file (mp4) into an audio file (mp3) using FFMPEG, but I have an IOException.
  Is there something wrong in my code ?

  import java.lang.Runtime;
  
  
  
  public class Basketball {
  
  
  
  /**
  
   * @param args the command line arguments
  
   */
  
  public static void main(String[] args) {
  
      Process p = Runtime.getRuntime().exec("ffmpeg highlightsCLGS.mp4 -vn -ab 256 highlightsOutput.mp3");
  
  }
  
  }

  And this is the error.

  Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - unreported exception java.io.IOException; must be caught or declared to be thrown
  
  at basketball.Basketball.main(Basketball.java:21)