Recherche avancée

Sur d’autres sites (6611)

• Is there a set of working P/Invoke declarations for FFMpeg, libavutil, libavformat and libavcodec in .NET ?

  11 février 2014, par casperOne

  I'm currently looking to access libavutil, libavformat and libavcodec (all part of FFMpeg) from .NET.

  Currently, I'm getting the libraries from the automated builds of the shared FFMpeg package performed every night for Windows 32-bit.

  I am also using the code from the ffmpeg-sharp project. In that project, I have removed a number of classes that were not compiling (they are wrapper classes not the P/Invoke declarations).

  The code compiles fine, but I am running into a few issues.

  First, it appears that the build of av*.dll uses the cdecl calling convention, as I was receiving a number of PInvokeStackImbalanceException when trying to call av_open_input_file. This was easy enough to change to get it to work right. The AVFormatContext structure is populated.

  After that, I want to call av_find_stream_info to get information about the streams in the file. However, when calling that with the AVFormatContext retrieved from the call to av_open_input_file, an AccessViolationException is thrown indicating that I am trying to read or write from protected memory.

  Has anyone used P/Invoke to access the libavutil, libavformat and libavcodec dll libraries through P/Invoke and have gotten it to work ?

  I should mention that working with the command-line version of FFMpeg, while a solution, is not a viable solution in this case, access needs to occur through the libraries. The reason for this is that I'd have to thrash the disk way too much to do what I need to do (I have to do a frame-by-frame analysis of some very high definition video) and I want to avoid the disk as much as possible.

• ffmpeg not working with piping to stdin

  16 janvier 2016, par Guig

  I want to stream a file that is being uploaded to ffmpeg. I’m using node.js and it’s not working !

  I ended up testing piping an input to ffmpeg from a local file, and this doens’t work either. Here’s my code :

  var processVideo = function(videoStream, resultPath) {
  
    var cmdParams = [
  
      '-i', '-',
  
      '-y',
  
      '-f', 'mp4',
  
      '-vcodec', 'libx264',
  
      '-vf', 'scale=-1:720',
  
      '-f', 'mp4',
  
      resultPath
  
    ];
  
    var ffmpeg = child_process.spawn('ffmpeg', cmdParams);
  
  
  
    var data = '';
  
    ffmpeg.stdout
  
      .on('data', function(chunk) { data += chunk; })
  
      .on('end', function() { console.log('result', data); });
  
  
  
    var err = '';
  
    ffmpeg.stderr
  
      .on('data', function(chunk) { err += chunk; })
  
      .on('end', function() { console.log('error', err);});
  
    videoStream.pipe(ffmpeg.stdin);
  
  };
  
  
  
  processVideo(fs.createReadStream(pathToLocalMP4File), localPathToResultFile);

  The output I get is

  error ffmpeg version 2.8 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with Apple LLVM version 7.0.0 (clang-700.1.76)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.8 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-libtheora --enable-vda
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd1e2802a00] stream 0, offset 0x20: partial file
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd1e2802a00] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 1920x1080, 16242 kb/s): unspecified pixel format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 537134592
  
      compatible_brands: mp42    
  
      creation_time   : 2015-12-26 12:47:49
  
    Duration: 00:00:04.00, bitrate: N/A
  
      Stream #0:0(und): Video: h264 (avc1 / 0x31637661), none, 1920x1080, 16242 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 60k tbc (default)
  
      Metadata:
  
        creation_time   : 2015-12-26 12:47:49
  
        encoder         : AVC Coding
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 32000 Hz, mono, fltp, 46 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-12-26 12:47:49
  
  [buffer @ 0x7fd1e1c08e20] Unable to parse option value "-1" as pixel format
  
      Last message repeated 1 times
  
  [buffer @ 0x7fd1e1c08e20] Error setting option pix_fmt to value -1.
  
  [graph 0 input from stream 0:0 @ 0x7fd1e1c08f60] Error applying options to the filter.
  
  Error opening filters!
  
  
  
  result 

  I tried to set the -pix_fmt option, or -analyzeduration and -probesize as suggested by the error code and this question, to no avail.

  However ffmpeg -i pathToLocalMP4File -y -f mp4 -pix_fmt yuv420p -vcodec libx264 -vf scale=-1:720 -f mp4 localPathToResultFile works perfectly in the terminal...

  Any idea ??

• Why FFMPEG commands not working in marshmallows and lollipop ?

  22 février 2016, par Andy Developer

  why my code is not working in marshmallows and lollipop devices. or any idea how to use FFMPEG in that versions. any help.

  import android.os.Bundle;
  
  import android.os.Environment;
  
  import android.support.v7.app.AppCompatActivity;
  
  import android.view.View;
  
  import android.view.View.OnClickListener;
  
  import android.widget.Button;
  
  import android.widget.Toast;
  
  
  
  import com.kru.ffmpeglibs.FFmpeg;
  
  import com.kru.ffmpeglibs.FFmpegExecuteResponseHandler;
  
  import com.kru.ffmpeglibs.FFmpegLoadBinaryResponseHandler;
  
  import com.kru.ffmpeglibs.exceptions.FFmpegCommandAlreadyRunningException;
  
  import com.kru.ffmpeglibs.exceptions.FFmpegNotSupportedException;
  
  
  
  public class CommandsActivity extends AppCompatActivity {
  
  private FFmpeg fFmpeg;
  
  private Button btnGenerate;
  
  
  
  @Override
  
  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_main);
  
  
  
      fFmpeg = FFmpeg.getInstance(CommandsActivity.this);
  
      executeBinary();
  
  
  
      btnGenerate = (Button) findViewById(R.id.btnGenerate);
  
      btnGenerate.setOnClickListener(new OnClickListener() {
  
          @Override
  
          public void onClick(View v) {
  
              try {
  
                  String[] ffmpegCommand = { "-i "
  
                          + Environment.getExternalStorageDirectory()
  
                                  .getPath()
  
                          + "/vid.mp4"
  
                          + " -r 10 "
  
                          + Environment.getExternalStorageDirectory()
  
                                  .getPath()
  
                          + "/com.mobvcasting.mjpegffmpeg/frame_%05d.jpg" };
  
  
  
                  executeCommand(ffmpegCommand);
  
  
  
              } catch (FFmpegCommandAlreadyRunningException e) {
  
                  e.printStackTrace();
  
              }
  
          }
  
      });
  
  }
  
  
  
  private void executeCommand(String[] cmd)
  
          throws FFmpegCommandAlreadyRunningException {
  
  
  
      fFmpeg.execute(cmd, new FFmpegExecuteResponseHandler() {
  
          @Override
  
          public void onSuccess(String message) {
  
  
  
              Toast.makeText(CommandsActivity.this, "Sucesses..",
  
                      Toast.LENGTH_SHORT).show();
  
  
  
              System.out.println(message);
  
          }
  
  
  
          @Override
  
          public void onProgress(String message) {
  
              // Toast.makeText(MainActivity.this, "On Process",
  
              // Toast.LENGTH_SHORT).show();
  
              System.out.println(message);
  
          }
  
  
  
          @Override
  
          public void onFailure(String message) {
  
              Toast.makeText(CommandsActivity.this, "Fail this",
  
                      Toast.LENGTH_SHORT).show();
  
              System.out.println(message);
  
          }
  
  
  
          @Override
  
          public void onStart() {
  
  
  
          }
  
  
  
          @Override
  
          public void onFinish() {
  
              Toast.makeText(CommandsActivity.this, "Finish",
  
                      Toast.LENGTH_SHORT).show();
  
  
  
          }
  
      });
  
  }
  
  
  
  private void executeBinary() {
  
  
  
      try {
  
          fFmpeg.loadBinary(new FFmpegLoadBinaryResponseHandler() {
  
              @Override
  
              public void onFailure() {
  
  
  
              }
  
  
  
              @Override
  
              public void onSuccess() {
  
  
  
              }
  
  
  
              @Override
  
              public void onStart() {
  
  
  
              }
  
              @Override
  
              public void onFinish() {
  
  
  
              }
  
          }); } catch (FFmpegNotSupportedException e) {   e.printStackTrace();
  
      }
  
    }
  
  }

  Here is my code but it still not working. please tell me what is wrong in the code
  The exception i got is something like this.

  02-22 11:18:41.469: E/AndroidRuntime(27839): FATAL EXCEPTION: main
  
  02-22 11:18:41.469: E/AndroidRuntime(27839):     java.lang.UnsatisfiedLinkError: Native method not found: com.kru.ffmpeglibs.ArmArchHelper.cpuArchFromJNI:()Ljava/lang/String;
  
  02-22 11:18:41.469: E/AndroidRuntime(27839):    at com.kru.ffmpeglibs.ArmArchHelper.cpuArchFromJNI(Native Method)
  
  02-22 11:18:41.469: E/AndroidRuntime(27839):    at com.kru.ffmpeglibs.CpuArchHelper.getCpuArch(CpuArchHelper.java:61)
  
  02-22 11:18:41.469: E/AndroidRuntime(27839):    at com.kru.ffmpeglibs.FFmpeg.loadBinary(FFmpeg.java:40)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at com.kru.sampleffmpeg.MainActivity.loadFFMpegBinary(MainActivity.java:68)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at com.kru.sampleffmpeg.MainActivity.onCreate(MainActivity.java:36)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at android.app.Activity.performCreate(Activity.java:5372)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at android.app.ActivityThread.access$700(ActivityThread.java:159)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at android.os.Handler.dispatchMessage(Handler.java:99)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at android.os.Looper.loop(Looper.java:176)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at android.app.ActivityThread.main(ActivityThread.java:5419)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at java.lang.reflect.Method.invokeNative(Native Method)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at java.lang.reflect.Method.invoke(Method.java:525)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
  
   02-22 11:18:41.469: E/AndroidRuntime(27839):   at dalvik.system.NativeStart.main(Native Method)