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• Android : how to film a video before extracting its audio

  20 février 2017, par MrOrgon

  Despite many searches, I haven’t been able to develop a Android prototype able to film a video before extracting its audio as .wav in a separate activity.

  I have developed so far a simple filming activity which relies on Android’s Camera application. My strategty was to put the video’s Uri as Extra to the next activity, before using FFMPEG, but I can’t make the transition between Uri and FFMPEG. Indeed, I’m a fresh Android Studio beginner, so I still am not sure about what concept to use.

  Here’s my code for the video recording activity.

  import android.net.Uri;
  
  import android.os.Build;
  
  import android.os.Bundle;
  
  import android.provider.MediaStore;
  
  import android.widget.Toast;
  
  import android.widget.VideoView;
  
  
  
  import java.io.File;
  
  import java.io.FileInputStream;
  
  import java.io.FileOutputStream;
  
  import java.io.IOException; 
  
  import java.nio.channels.FileChannel;
  
  
  
  import static java.security.AccessController.getContext;
  
  
  
  
  
  public class RecordActivity extends Activity{
  
  
  
  static final int REQUEST_VIDEO_CAPTURE = 0;
  
  
  
  VideoView mVideoView = null;
  
  Uri videoUri = null;
  
  
  
  @Override
  
  public void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      mVideoView = (VideoView) findViewById(R.id.videoVieww);
  
      setContentView(R.layout.activity_record);
  
  
  
      Intent takeVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
  
  
  
      Toast.makeText(RecordActivity.this,         String.valueOf(Build.VERSION.SDK_INT) , Toast.LENGTH_SHORT).show();
  
  
  
      takeVideoIntent.putExtra(MediaStore.EXTRA_OUTPUT, videoUri);
  
      if (takeVideoIntent.resolveActivity(getPackageManager()) != null) {
  
          startActivityForResult(takeVideoIntent, REQUEST_VIDEO_CAPTURE);
  
      }
  
  
  
  }
  
  
  
  
  
      @Override
  
      protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
  
          if (requestCode == REQUEST_VIDEO_CAPTURE && resultCode == RESULT_OK) {
  
              videoUri = intent.getData();
  
  
  
              Intent intentForFilterActivity = new Intent(RecordActivity.this, FilterActivity.class);
  
              intentForFilterActivity.putExtra("VideoToFilter", videoUri.getPath());
  
              startActivity(intentForFilterActivity);
  
  
  
          }
  
      }
  
  }

  Here’s the the code for the audio extraction activity. It is called "FilterActivity", as its final aim is to filter outdoor noise using additional functions. I’m using WritingMinds’ implementation of FFMPEG.
  https://github.com/WritingMinds/ffmpeg-android-java

   import android.app.Activity;
  
   import android.content.Intent;
  
   import android.os.Bundle;
  
   import android.test.ActivityUnitTestCase;
  
   import android.widget.Toast;
  
  
  
   import com.github.hiteshsondhi88.libffmpeg.ExecuteBinaryResponseHandler;
  
   import com.github.hiteshsondhi88.libffmpeg.FFmpeg;
  
   import  com.github.hiteshsondhi88.libffmpeg.exceptions.FFmpegCommandAlreadyRunningException;
  
  
  
  
  
  
  
  public class FilterActivity extends Activity {
  
  
  
  @Override
  
  public void onCreate(Bundle savedInstanceState) {
  
  
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_filter);
  
  
  
      Intent intentVideo = getIntent();
  
      String pathIn = intentVideo.getStringExtra("VideoToFilter");
  
  
  
      FFmpeg ffmpeg = FFmpeg.getInstance(FilterActivity.this);
  
      try {
  
          String[] cmdExtract = {"-i " + pathIn + " extracted.wav"};
  
          ffmpeg.execute(cmdExtract, new ExecuteBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onStart() {}
  
  
  
              @Override
  
              public void onProgress(String message) {}
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  Toast.makeText(FilterActivity.this, "Failure !", Toast.LENGTH_SHORT).show();
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message) {}
  
  
  
              @Override
  
              public void onFinish() {}
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
      }
  
  }
  
  
  
  
  
  }

  and I always get the "Failure !" message.

  Some parts of the code may look extremely bad. As as written previously, I’m a real Android Studio beginner.

  Do you have any correction that could work ? Or even just a strategy ?

  Thank you in advance !

• Evolution #3908 (Nouveau) : Mémo des raccourcis près du champ

  24 février 2017, par tetue tetue

  Pour aider à la saisie des rédacteurices, ce serait super gentil d’afficher un mémo des raccourcis SPIP, en contexte, c’est-à-dire à proximité immédiate du champ de saisie du porte-plume.

  Fonctionnement : un bouton d’aide (avec picto conventionnel en point d’interrogation) déplie un encart juste au dessus du champ de saisie (pas en popin ni ailleurs), qui affiche un mémo synthétique des principaux raccourcis, de façon à pouvoir les avoir sous les yeux PENDANT la saisie.
  Depuis cet encart un lien permet, à celleux qui en ont besoin, d’aller consulter les explications dans la documentation complète.

  Voir wireframe joint.

  Ceci vaut pour toutes les occurrences du porte-plume, en back comme en front, en champ dans la page et en full screen.

• Looking for Javacpp FFMPEG CustomIO Example

  26 février 2017, par user1902291

  I am trying to get Custom IO working with JavaCPP FFMPEG. Has anyone succeeded at this ? Can you post your code ?

  Here is mine (Scala), which does not work. It compiles and runs, but does not seem to call my Read and Seek methods

  val readPtr = new Pointer()
  
  val seekPtr = new Pointer()
  
  val userDataPtr = new Pointer()
  
  val read = new Read_packet_Pointer_BytePointer_int(readPtr) {
  
    override def call(userDataPtr: Pointer, @Cast(Array("uint8_t*")) buf: BytePointer, buf_size: Int): Int = {
  
      super.call(userDataPtr, buf, buf_size)
  
    }
  
  }
  
  val seek = new Seek_Pointer_long_int(seekPtr) {
  
    @Cast(Array("int64_t")) override def call(userDataPtr: Pointer, @Cast(Array("int64_t")) offset: Long, whence: Int): Long = {
  
      super.call(userDataPtr, offset, whence)
  
    }
  
  }
  
  
  
  val bufferSize = 1024 * 1024
  
  val readBuffer = new BytePointer(bufferSize)
  
  
  
  val avioContext = avformat.avio_alloc_context(
  
    readBuffer,   // internal buffer
  
    bufferSize,   // and its size
  
    0,            // write flag (1=true,0=false)
  
    userDataPtr,  // user data, will be passed to our callback functions
  
    read,
  
    null,         // no writing
  
    seek
  
  )
  
  
  
  formatContext.pb(avioContext)
  
  formatContext.flags(formatContext.flags | avformat.AVFormatContext.AVFMT_FLAG_CUSTOM_IO)
  
  formatContext.iformat(avformat.av_find_input_format("mp4"))
  
  
  
  avformat.avformat_open_input(formatContext, null.asInstanceOf[String], null, null)