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• Merge AVCHD (.MTS) movies in JavaCV

  31 août 2014, par user2645214

  I need to merge .mts video files using JavaCV.
  Currently i use such code :

  public void merge2(){
  
  
  
              try {
  
                  FrameGrabber grabber1 = new FFmpegFrameGrabber("movie1.mpg");
  
                  grabber1.start();
  
                  FrameGrabber grabber2 = new FFmpegFrameGrabber("movie2.mpg");
  
                  grabber2.start();
  
  
  
                  FrameRecorder recorder2 = new FFmpegFrameRecorder("binded.mpg", grabber1.getImageWidth(), grabber1.getImageHeight(),grabber1.getAudioChannels());
  
                  recorder2.setFrameRate(grabber1.getFrameRate());
  
                  recorder2.start();
  
  
  
  
  
                  Frame frame;
  
                  while ((frame = grabber1.grabFrame()) != null) {    
  
                      recorder2.record(frame);        
  
                  }
  
  
  
                  while ((frame = grabber2.grabFrame()) != null) {
  
                      recorder2.record(frame);           
  
                  }
  
  
  
                  recorder2.stop();
  
                  grabber2.stop();
  
                  grabber1.stop();
  
              } catch (org.bytedeco.javacv.FrameGrabber.Exception | org.bytedeco.javacv.FrameRecorder.Exception e) {                  
  
                      e.printStackTrace();
  
              } 
  
  
  
      }

  ...which works well with the most popular video file formats such like .avi, .mpg, .mp4 or rmvb (however I have to use recent JavaCV library snapshot (0.9.1-20140828) ). But when i try merging 2 .MTS files I get error :

  org.bytedeco.javacv.FrameGrabber$Exception: avformat_open_input() error -2: Could not open input "movie1.mpg". (Has setFormat() been called?)

  (In this error movie1 has .mpg extension even although FFmpegFrameGrabber parameter is `FFmpegFrameGrabber("movie1.MTS") ; )

  As I understand , I should properly use setFormat(...) methods. But when I add this methods :

  public void merge2(){
  
  
  
              try {
  
                  FrameGrabber grabber1 = new FFmpegFrameGrabber("00727.MTS");
  
                  grabber1.setFormat(".MTS");
  
                  grabber1.start();
  
                  FrameGrabber grabber2 = new FFmpegFrameGrabber("00728.MTS");
  
                  grabber2.setFormat(".MTS");
  
                  grabber2.start();
  
  
  
                  FrameRecorder recorder2 = new FFmpegFrameRecorder("binded.MTS", grabber1.getImageWidth(), grabber1.getImageHeight(),grabber1.getAudioChannels());
  
                  recorder2.setFrameRate(grabber1.getFrameRate());
  
                  recorder2.setFormat(".MTS");
  
                  recorder2.start();
  
  
  
  
  
                  Frame frame;
  
                  while ((frame = grabber1.grabFrame()) != null) {    
  
                      recorder2.record(frame);        
  
                  }
  
  
  
                  while ((frame = grabber2.grabFrame()) != null) {
  
                      recorder2.record(frame);           
  
                  }
  
  
  
                  recorder2.stop();
  
                  grabber2.stop();
  
                  grabber1.stop();
  
              } catch (org.bytedeco.javacv.FrameGrabber.Exception | org.bytedeco.javacv.FrameRecorder.Exception e) {                  
  
                      e.printStackTrace();
  
              } 
  
  
  
      }

  ... i got error :

   av_find_input_format() error: Could not find input format ".MTS".

  So, is it possible to merge 2 .MTS video files in JavaCv ? If not how can I try to deal with this problem - how can I join .MTS files in Java ? Actually I have no idea, so all tips will be appreciated :).

• Error decoding a simple audio file using FFmpeg library

  29 mars 2017, par satyres

  After successfuly compiling the latest version of FFmpeg library and generated .a library in Ubuntu I’ve been struggling now for more than a week to decode and play a simple mp3 file in Android without a success !
  I’ve followed this tutorial given by FFmpeg team in Github i’ve tried to use it in Android but no luck !
  here is the Native code.

  void Java_com_example_home_hellondk_MainActivity_audio_1decode_1example(JNIEnv * env, jobject obj, jstring file, jbyteArray array) {
  
      jboolean isfilenameCopy;
  
      const char * filename = ( * env) - > GetStringUTFChars(env, file, &
  
          isfilenameCopy);
  
      jclass cls = ( * env) - > GetObjectClass(env, obj);
  
      jmethodID play = ( * env) - > GetMethodID(env, cls, "playSound", "([BI)V");
  
      AVCodec * codec;
  
      AVCodecContext * c = NULL;
  
      int len;
  
      FILE * f, * outfile;
  
      uint8_t inbuf[AUDIO_INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
  
      AVPacket avpkt;
  
      AVFrame * decoded_frame = NULL;
  
  
  
      av_init_packet( & avpkt);
  
  
  
      printf("Decode audio file %s \n", filename);
  
      LOGE("Decode audio file %s\n", filename);
  
      /* find the MPEG audio decoder */
  
      codec = avcodec_find_decoder(AV_CODEC_ID_MP3);
  
      if (!codec) {
  
          fprintf(stderr, "Codec not found\n");
  
          LOGE("Codec not found\n");
  
          exit(1);
  
      }
  
  
  
      c = avcodec_alloc_context3(codec);
  
      if (!c) {
  
          fprintf(stderr, "Could not allocate audio codec context\n");
  
          LOGE("Could not allocate audio codec context\n");
  
          exit(1);
  
      }
  
  
  
      /* open it */
  
      if (avcodec_open2(c, codec, NULL) < 0) {
  
          fprintf(stderr, "Could not open codec\n");
  
          LOGE("Could not open codec\n");
  
          exit(1);
  
      }
  
  
  
      f = fopen(filename, "rb");
  
      if (!f) {
  
          fprintf(stderr, "Could not open %s\n", filename);
  
          LOGE("Could not open %s\n", filename);
  
          exit(1);
  
      }
  
  
  
  
  
      /* decode until eof */
  
      avpkt.data = inbuf;
  
      avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f);
  
  
  
      while (avpkt.size > 0) {
  
          int i, ch;
  
          int got_frame = 0;
  
  
  
          if (!decoded_frame) {
  
              if (!(decoded_frame = av_frame_alloc())) {
  
                  fprintf(stderr, "Could not allocate audio frame\n");
  
                  LOGE("Could not allocate audio frame\n");
  
                  exit(1);
  
              }
  
          }
  
  
  
          len = avcodec_decode_audio4(c, decoded_frame, & got_frame, & avpkt);
  
          if (len < 0) {
  
              fprintf(stderr, "Error while decoding\n");
  
              LOGE("Error while decoding\n");
  
              exit(1);
  
          }
  
          if (got_frame) {
  
              /* if a frame has been decoded, output it */
  
              int data_size = av_get_bytes_per_sample(c - > sample_fmt);
  
              if (data_size < 0) {
  
                  /* This should not occur, checking just for paranoia */
  
                  fprintf(stderr, "Failed to calculate data size\n");
  
                  LOGE("Failed to calculate data size\n");
  
                  exit(1);
  
              }
  
              if (data_size > 0) {
  
  
  
                  jbyte * bytes = ( * env) - > GetByteArrayElements(env, array, NULL);
  
                  memcpy(bytes, decoded_frame, got_frame); //
  
                  ( * env) - > ReleaseByteArrayElements(env, array, bytes, 0);
  
                  ( * env) - > CallVoidMethod(env, obj, play, array, got_frame);
  
                  LOGE("DECODING ERROR5");
  
              }
  
          }
  
          avpkt.size -= len;
  
          avpkt.data += len;
  
          avpkt.dts =
  
              avpkt.pts = AV_NOPTS_VALUE;
  
          if (avpkt.size < AUDIO_REFILL_THRESH) {
  
              /* Refill the input buffer, to avoid trying to decode
  
               * incomplete frames. Instead of this, one could also use
  
               * a parser, or use a proper container format through
  
               * libavformat. */
  
              memmove(inbuf, avpkt.data, avpkt.size);
  
              avpkt.data = inbuf;
  
              len = fread(avpkt.data + avpkt.size, 1,
  
                  AUDIO_INBUF_SIZE - avpkt.size, f);
  
              if (len > 0)
  
                  avpkt.size += len;
  
          }
  
      }
  
  
  
  
  
      fclose(f);
  
  
  
      avcodec_free_context( & c);
  
      av_frame_free( & decoded_frame);
  
  
  
  }

  The Java code :

  package com.example.home.hellondk;
  
  
  
  import android.media.AudioFormat;
  
  import android.media.AudioManager;
  
  import android.media.AudioTrack;
  
  import android.media.MediaPlayer;
  
  import android.support.v7.app.AppCompatActivity;
  
  import android.os.Bundle;
  
  import android.util.Log;
  
  
  
  import java.io.File;
  
  import java.io.FileNotFoundException;
  
  import java.io.FileOutputStream;
  
  import java.io.IOException;
  
  
  
  public class MainActivity extends AppCompatActivity {
  
      static {
  
          System.loadLibrary("MyLibraryPlayer");
  
      }
  
      public native void createEngine();
  
  
  
      public native void audio_decode_example(String outfilename, byte[] array);
  
  
  
  
  
  
  
      private AudioTrack track;
  
      private FileOutputStream os;
  
  
  
      @Override
  
      protected void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_main);
  
          createEngine();
  
  
  
   /*        MediaPlayer mp = new MediaPlayer();
  
          mp.start();*/
  
  
  
          int bufSize = AudioTrack.getMinBufferSize(32000,
  
                  AudioFormat.CHANNEL_CONFIGURATION_STEREO,
  
                  AudioFormat.ENCODING_PCM_16BIT);
  
  
  
          track = new AudioTrack(AudioManager.STREAM_MUSIC,
  
                  32000,
  
                  AudioFormat.CHANNEL_CONFIGURATION_STEREO,
  
                  AudioFormat.ENCODING_PCM_16BIT,
  
                  bufSize,
  
                  AudioTrack.MODE_STREAM);
  
  
  
          byte[] bytes = new byte[bufSize];
  
  
  
          try {
  
              os = new FileOutputStream("/storage/emulated/0/Cloud Radio/a.out", false);
  
          } catch (FileNotFoundException e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          }
  
     audio_decode_example("/storage/emulated/0/Cloud Radio/test.mp3", bytes);
  
  
  
      }
  
  
  
      void playSound(byte[] buf, int size) {
  
          //android.util.Log.v("ROHAUPT", "RAH Playing");
  
          if (track.getPlayState() != AudioTrack.PLAYSTATE_PLAYING)
  
              track.play();
  
          track.write(buf, 0, size);
  
  
  
          try {
  
              os.write(buf, 0, size);
  
          } catch (IOException e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          }
  
      }
  
  }

  I always got this error : Error while decoding .
  i’ve tried to change the decoder "AV_CODEC_ID_MP3" no sucess !
  Thank you so much for your help.
  Kind regards

• How to get your Piwik plugin translated in many languages ?

  8 septembre 2015, par Stefan Giehl — Community, Development, Plugins

  About a year ago we introduced the Piwik Marketplace to make it easy for developers to share their plugins with all Piwik users.

  As Piwik is currently available in 54 languages we would love to have as many plugins as possible available in at least a few of those languages.

  Currently most plugins on the Marketplace are only available in English and sometimes some other languages. To improve this situation, we offer plugin developers the possibility to use the power of our translators community to get their plugins translated.

  Some plugin developers are already using this service and some very popular plugins like BotTracker or CustomOptOut have already been translated in more than 10 languages !

  Getting translations for your plugin

  As long as you are developing an open source plugin hosted on Github, you may get in touch with us (translations@piwik.org) in order to get your plugin translated by the Piwik translators community.

  You will need an account on Transifex.com. If you use Transifex with a social login, please ensure to set a password in your account settings. This will be required for fetching new translations into your plugin repository.

  Importing your plugin’s strings in the translation platform

  While doing the initial setup for your plugin, we will import your english translation file (en.json) in your Github plugin repository and we will configure an auto-update for this file. Source strings on Transifex will automatically synchronise with your plugin repository. When you change any string in your en.json translation file, the updated English strings will automatically be imported in Transifex.

  How to fetch your plugins translations into your repository

  As soon as we have set up your plugin within our project Piwik on Transifex and there are new translations available, you will be able to update your plugin translations using the Piwik console. You will need a locally installed Piwik with development mode enabled, and your plugin installed. To update the translations go to the Piwik directory on your development box and execute the following command :

  ./console translations:update -u {YourTransifexUserName} -p {YourTransifexPassword} -P {YourPluginName}

  We are looking forward to seeing your Piwik plugins available in more languages ! For more information, check out our Translations plugin developer guide.

  Happy hacking,