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• Error Link 2001 libavformat.a(tls_schannel.o) when building any ffmpeg project in Visual Studio 2010

  15 mai 2017, par M.Taha

  I have just built ffmpeg latest version 3.0 and when I am trying to build ffmpeg related project in Visual Studio 2010, it gives this error :

  libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol _FreeContextBuffer@4

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol _InitializeSecurityContextA@48

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol __imp__ApplyControlToken@8

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol __imp__FreeCredentialsHandle@4

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol __imp__DeleteSecurityContext@4

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol _AcquireCredentialsHandleA@36

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol _DecryptMessage@16

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol _EncryptMessage@16

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol _QueryContextAttributesA@12

  My project is able to build an older version from 2014. When I search in 2014 ffmpeg there is no tls_schannel.c present.

  But I have to make project now with latest ffmpeg3.0.
  So please tell me how to make it work.

• executing batch file when called from java project

  28 décembre 2013, par Mostafa Wasat

  So I'm working on a java project, that at some point I have to execute a batch file (from within the code).

  The batch file runs fine if I run it by double clicking in windows explorer,
  and/or even if I write the command in the command prompt it runs ok.

  However, when i call the file from the java code, the command prompt launches and says that its not a recognized command, program, or batch file.

  the patch file looks something like this :

  ffmpeg -re -i C:/001.mp3 -c:a mp3 -ar 12000 -f mulaw -f rtp rtp://127.0.0.1:1234

  and here's how I call it within the java code :

  Runtime.getRuntime().exec("cmd /c start c:\\encode.bat");

  I might add that the command prompt when run by java it runs as administrator and I have included the ffmpeg path to be run by any user anyway.

  Excuse me if I have missed any important details and would be happy to provide them if anyone needs further details to answer my dilemma.

  why might this be ?

  Edit :
  i have tried the same code on another pc and it works fine, can someone please explain to me why the command doesnt get recognized when the command prompt gets run through java

• How to concatenate videos using FFMPEG in android using guardian project

  12 juin 2014, par Divya Motiwala

  I am trying to combine two mp4 videos using guardian project as library project in my app. But it does not generate the output at specified location. I went through various solution for it but no success.
  PFB the code :

  File fileTmp = this.getCacheDir(); 
  
  File fileAppRoot = new File(this.getApplicationInfo().dataDir);
  
  
  
  FfmpegController fc;
  
  
  
  fc = new FfmpegController(fileTmp, fileAppRoot);
  
  
  
  
  
  
  
      final Clip out = new Clip(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)+"/Video/compiled.mp4");
  
  
  
      ArrayList<clip> listVideos = new ArrayList<clip>();
  
  
  
      File fileVideoRoot = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)+"/Video");
  
      String[] fileList = fileVideoRoot.list();
  
  
  
      for (String fileVideo : fileList)
  
      {
  
          if (fileVideo.endsWith("mp4"))
  
          {
  
              Clip clip = new Clip();
  
              clip.path = new File(fileVideoRoot,fileVideo).getCanonicalPath();
  
  
  
              fc.getInfo(clip);
  
  
  
              clip.duration = clip.duration-1;
  
              listVideos.add(clip);
  
  
  
  
  
          }
  
      }
  
  
  
  
  
      fc.concatAndTrimFilesMP4Stream(listVideos, out, false, false, new ShellUtils.ShellCallback() {
  
  
  
          @Override
  
          public void shellOut(String shellLine) {
  
  
  
              System.out.println("fc>" + shellLine);
  
          }
  
  
  
          @Override
  
          public void processComplete(int exitValue) {
  
  
  
              if (exitValue &lt; 0)
  
                  System.err.println("concat non-zero exit: " + exitValue);
  
  
  
          }
  
      });
  
  </clip></clip>

  I am getting exception :

  There was a problem rendering the video :
  /mnt/sdcard/Download/Video/compiled.mp4

  Please guide me on how to concatenate videos in android.