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• OpenCV no longer working after Homebrew install

  28 mars 2014, par Tom smith

  I have have been running OpenCV from QT creator on Mac OSX.
  I was having trouble getting VideoWriter to work so it was suggested I try installing ffmpeg with opencv.
  Using brew I executed this command

  brew install homebrew/science/opencv --with-ffmpeg 

  However, during this process I received the following error

  Warning: Could not link opencv. Unlinking...
  
  Error: The `brew link` step did not complete successfully
  
  The formula built, but is not symlinked into /usr/local
  
  You can try again using `brew link opencv'

  The "possible conflicting files were mostly from "/usr/local/include/opencv2/"

  I tried the command brew suggested but this gave me a permission denied warning so I found a fix to execute before the command, both of which are below.

  sudo chown -R `whoami` /usr/local
  
  brew link --overwrite opencv

  This appeared to execute correctly giving me the following response

  Linking /usr/local/Cellar/opencv/2.4.8.2... 251 symlinks created

  The problem is this now seems to have broken my working project. When I try to run the project now I get the following errors
  Unfortunately after trying to rebuild the project I cannot get the error below to show up in the terminal again but it said the following error, was expected in /usr/local/include but not found in the build directory (afraid I cannot be sure of the exact wording)

  dyld: lazy symbol binding failed:

  In QT creator however, when trying to build the project it says

  error: symbol(s) not found for architecture x86_64
  
  error: linker command failed with exit code 1 (use -v to see invocation)

  Any suggestions for a fix, and also how I can get VideoWriter to work with opencv on Mac OSX after I have my project working again ?

• running ffmpeg command in java Process hangs in waitFor()

  9 juin 2015, par Mahesha M

  I’m running ffmpeg command to generate video for given images (img001.jpg, img002.jpg ...) it’s creating slide.mp4, but it waits infinitely :

  public class Ffmpeg {
  
  
  
  public static void main(String[] args) throws IOException, InterruptedException {
  
      String path = "E:\\pics\\Santhosh\\FadeOut\\testing";       
  
      String cmd = "ffmpeg -r 1/5 -i img%03d.jpg -c:v libx264 -r 30 -y -pix_fmt yuv420p slide.mp4";
  
      runScript (path, cmd);
  
  }
  
  
  
  private static boolean runScript(String path, String cmd) throws IOException, InterruptedException {       
  
      List<string> commands = new ArrayList<string>();
  
      commands.add("cmd");
  
      commands.add("/c");
  
      commands.add(cmd);
  
      ProcessBuilder pb = new ProcessBuilder(commands);
  
      pb.directory(new File(path));
  
      pb.redirectErrorStream(true);
  
      Process process = pb.start();   
  
      flushInputStreamReader(process);                
  
      int exitCode = process.waitFor();
  
      return exitCode == 0;
  
  }    
  
  }
  
  
  
  private static void flushInputStreamReader (Process process) throws IOException, InterruptedException {
  
              BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStream()));
  
              String line=null;
  
              StringBuilder s = new StringBuilder();
  
              while((line=input.readLine()) != null) {            
  
                  s.append(line);
  
              }
  
          }
  
  </string></string>

  Any suggestions ?

  After writing the function flushInputStreamReader, its working

• running ffmpeg command in java Process hangs in waitFor()

  14 février 2021, par Mahesha M

  I'm running ffmpeg command to generate video for given images (img001.jpg, img002.jpg ...) it's creating slide.mp4, but it waits infinitely :

  



  public class Ffmpeg {&#xA;&#xA;public static void main(String[] args) throws IOException, InterruptedException {&#xA;    String path = "E:\\pics\\Santhosh\\FadeOut\\testing";       &#xA;    String cmd = "ffmpeg -r 1/5 -i img%03d.jpg -c:v libx264 -r 30 -y -pix_fmt yuv420p slide.mp4";&#xA;    runScript (path, cmd);&#xA;}&#xA;&#xA;private static boolean runScript(String path, String cmd) throws IOException, InterruptedException {       &#xA;    List<string> commands = new ArrayList<string>();&#xA;    commands.add("cmd");&#xA;    commands.add("/c");&#xA;    commands.add(cmd);&#xA;    ProcessBuilder pb = new ProcessBuilder(commands);&#xA;    pb.directory(new File(path));&#xA;    pb.redirectErrorStream(true);&#xA;    Process process = pb.start();   &#xA;    flushInputStreamReader(process);                &#xA;    int exitCode = process.waitFor();&#xA;    return exitCode == 0;&#xA;}    &#xA;}&#xA;&#xA;private static void flushInputStreamReader (Process process) throws IOException, InterruptedException {&#xA;            BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStream()));&#xA;            String line=null;&#xA;            StringBuilder s = new StringBuilder();&#xA;            while((line=input.readLine()) != null) {            &#xA;                s.append(line);&#xA;            }&#xA;        }&#xA;</string></string>

  



  Any suggestions ?

  



  After writing the function flushInputStreamReader, its working