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• Unable to merge videos in Android using JavaCV ("Sample Description" Error)

  15 décembre 2015, par San

  I am creating a video from images via FFMPEG and I am able to get the video from images. I am also making use of JavaCV to merge two videos and I am able to join videos using JavaCV without any issues provided both the videos are taken via camera, i.e, a video actually recorded via mobile camera.

  Issue that I’m facing :

  I am not able to merge the video that was generated from FFMPEG using the images along with the video user has chosen which will mostly be a video that was not generated and taken via mobile camera.

  CODE :
  Code to generate Video via Images :

                    FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(path + "/" + "dec16.mp4", 800, 400);
  
                              try {
  
                                  recorder.setVideoCodec(avcodec.AV_CODEC_ID_MPEG4);
  
                                  //recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
  
                                  recorder.setVideoCodecName("H264");
  
                                  recorder.setVideoOption("preset", "ultrafast");
  
                                  recorder.setFormat("mp4");
  
                                  recorder.setFrameRate(frameRate);
  
                                  recorder.setVideoBitrate(60);
  
                                  recorder.setPixelFormat(avutil.AV_PIX_FMT_YUV420P);
  
                                  startTime = System.currentTimeMillis();
  
                                  recorder.start();
  
                                  for(int j=0;j recorder.getTimestamp()) {
  
  
  
                                          recorder.setTimestamp(t);
  
                                          recorder.record(image);
  
                                      }
  
                                  }
  
                                  recorder.stop();
  
                              } catch (Exception e) {
  
                                  e.printStackTrace();
  
                              }

  Code to merge Videos :

   int count = file_path.size();
  
              System.out.println("final_joined_list size " + file_path.size());
  
              if (file_path.size() != 1) {
  
                  try {
  
                      Movie[] inMovies = new Movie[count];
  
                      mediaStorageDir = new File(
  
                              Environment.getExternalStorageDirectory()
  
                                      + "/Pictures");
  
  
  
                      for (int i = 0; i < count; i++) {
  
                          File file = new File(file_path.get(i));
  
                          System.out.println("fileeeeeeeeeeeeeeee " + file);
  
                          System.out.println("file exists!!!!!!!!!!");
  
  
  
                          FileInputStream fis = new FileInputStream(file);
  
                          FileChannel fc = fis.getChannel();
  
                          inMovies[i] = MovieCreator.build(fc);
  
                          fis.close();
  
                          fc.close();
  
  
  
                      }
  
                      List<track> videoTracks = new LinkedList<track>();
  
                      List<track> audioTracks = new LinkedList<track>();
  
                      Log.d("Movies length", "isss  " + inMovies.length);
  
                      if (inMovies.length != 0) {
  
  
  
                          for (Movie m : inMovies) {
  
  
  
                              for (Track t : m.getTracks()) {
  
                                  if (t.getHandler().equals("soun")) {
  
                                      audioTracks.add(t);
  
                                  }
  
                                  if (t.getHandler().equals("vide")) {
  
                                      videoTracks.add(t);
  
                                  }
  
                                  if (t.getHandler().equals("")) {
  
  
  
                                  }
  
                              }
  
  
  
                          }
  
                      }
  
  
  
                      Movie result = new Movie();
  
  
  
                      System.out.println("audio and videoo tracks : "
  
                              + audioTracks.size() + " , " + videoTracks.size());
  
                      if (audioTracks.size() > 0) {
  
                          result.addTrack(new AppendTrack(audioTracks
  
                                  .toArray(new Track[audioTracks.size()])));
  
                      }
  
                      if (videoTracks.size() > 0) {
  
                          result.addTrack(new AppendTrack(videoTracks
  
                                  .toArray(new Track[videoTracks.size()])));
  
                      }
  
                      IsoFile out = null;
  
                      try {
  
                          out = (IsoFile) new DefaultMp4Builder().build(result);
  
                      } catch (Exception e) {
  
                          // TODO Auto-generated catch block
  
                          e.printStackTrace();
  
                      }
  
  
  
                      long timestamp = new Date().getTime();
  
                      String timestampS = "" + timestamp;
  
  
  
                      File storagePath = new File(mediaStorageDir
  
                              + File.separator);
  
                      storagePath.mkdirs();
  
                      File myMovie = new File(storagePath, String.format("%s.mp4", timestampS));
  
                      FileOutputStream fos = new FileOutputStream(myMovie);
  
                      FileChannel fco = fos.getChannel();
  
                      fco.position(0);
  
                      out.getBox(fco);
  
                      fco.close();
  
                      fos.close();
  
  
  
                  } catch (FileNotFoundException e) {
  
                      // TODO Auto-generated catch block
  
                      e.printStackTrace();
  
                  } catch (IOException e) {
  
                      // TODO Auto-generated catch block
  
                      e.printStackTrace();
  
                  }
  
                  String mFileName = Environment.getExternalStorageDirectory()
  
                          .getAbsolutePath();
  
                  // mFileName += "/output.mp4";
  
  
  
                  File sdCardRoot = Environment.getExternalStorageDirectory();
  
                  File yourDir = new File(mediaStorageDir + File.separator);
  
                  for (File f : yourDir.listFiles()) {
  
                      if (f.isFile())
  
                          name = f.getName();
  
                      // make something with the name
  
                  }
  
                  mFileName = mediaStorageDir.getPath() + File.separator
  
                          + "output-%s.mp4";
  
                  System.out.println("final filename : "
  
                          + mediaStorageDir.getPath() + File.separator
  
                          + "output-%s.mp4" + "names of files : " + name);
  
                  single_video = false;
  
                  return name;
  
              } else {
  
                  single_video = true;
  
                  name = file_path.get(0);
  
                  return name;
  
              }
  
  </track></track></track></track>

  Error :

  The Error that I am facing while trying to merge the videos generated via Images and a normal video is

  12-15 12:26:06.155  26022-26111/? W/System.err﹕ java.io.IOException: Cannot append com.googlecode.mp4parser.authoring.Mp4TrackImpl@45417c38 to com.googlecode.mp4parser.authoring.Mp4TrackImpl@44ffac60 since their Sample Description Boxes differ
  
  12-15 12:26:06.155  26022-26111/? W/System.err﹕ at com.googlecode.mp4parser.authoring.tracks.AppendTrack.<init>(AppendTrack.java:48)
  
  </init>

  Fix that I tried :

  Google advised me to change the CODEC in JavaCV from avcodec.AV_CODEC_ID_MPEG4 to avcodec.AV_CODEC_ID_H264. But when I did that, I am not able to get the video from images thereby throwing the following error :

  12-15 12:26:05.840  26022-26089/? W/linker﹕ libavcodec.so has text relocations. This is wasting memory and is a security risk. Please fix.
  
  12-15 12:26:05.975  26022-26089/? W/System.err﹕ com.googlecode.javacv.FrameRecorder$Exception: avcodec_open2() error -1: Could not open video codec.
  
  12-15 12:26:05.975  26022-26089/? W/System.err﹕ at com.googlecode.javacv.FFmpegFrameRecorder.startUnsafe(FFmpegFrameRecorder.java:492)
  
  12-15 12:26:05.975  26022-26089/? W/System.err﹕ at com.googlecode.javacv.FFmpegFrameRecorder.start(FFmpegFrameRecorder.java:267)

  What I need :

  Creating video from Images is inevitable and that video will definitely be used to merge with other videos which might have any Codec Formats. So I need to find a way to merge any kind of videos irrespective of their Codecs or any other parameters. I am trying to keep it simple by just using the Jars and SO files and I dont want to drive myself crazy by going on a full scale implementation of FFMPEG Library. That being said, I am also ready to look into that library if I dont have any other ways to achieve what I want but a solid resource with an ALMOST working code would be much appreciated. Cheers.

  Update :
  I looked upon the issues mentioned at GitHub of OpenCV, but didnt find anything solid from it.
  OpenCV Issues

• avplay : Statically allocate the player state

  2 janvier 2016, par Luca Barbato

  avplay : Statically allocate the player state
  And move the resource deallocation in stream_open failure path.
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DBH] avplay.c

• Issue while opening a .mp4 file - CPU shoots up 100%

  16 juillet 2014, par AnilJ

  I am using IMediaWriter, to write out about 20 video frames into an independent .mp4 file and creating a new writer to write a new file. This is a logic (not so efficient one), I’ve used to chunk the web-cam feed into chunks. I am able to successfully able to create multiple .mp4 video files and when opened then in a VLC player, they can be played back.

  However, when I try to open one of the chunked file into a new IContainer object (see below code snippet), my program :

  • Gets stuck at the container.open() call ( see * below), and the CPU
    utilization shoots above 100%.
  • Sometimes it throws an error "moov atom not found", and hence can not open the file.

  In both the cases, my program does not work.

  <code snippet="snippet">
  
          String file = BASE_PATH + File.separator + "output" + File.separator + "output.mp4";  // This is one of the chunk.
  
          IContainer container = IContainer.make();
  
          FileChannel channel = null;
  
  
  
          try {
  
              @SuppressWarnings("resource")
  
              RandomAccessFile inFile = new RandomAccessFile(chunkFile, "r");
  
              channel = inFile.getChannel();
  
          } catch (FileNotFoundException e) {
  
              e.printStackTrace();
  
          }
  
  
  
          // Open up the container
  
  ***        int retval = container.open(channel, IContainer.Type.READ, null);
  
          if (retval &lt; 0) {
  
              // This little trick converts the non friendly integer return value into 
  
              // a slightly more friendly object to get a human-readable error name
  
              IError error = IError.make(retval);
  
              throw new IllegalArgumentException("could not open file: " + mInputFileChannel + "; Error: " + error.getDescription());
  
          }
  
  <code snippet="snippet">
  
  

  Subsequently, I ran the AtomicParsley tool to dump the file content, and it prints following. I am not aware of video file internals and seeking help to know the issue here and potential solution.

  Atom ftyp @ 0 of size: 28, ends @ 28
  
  Atom free @ 28 of size: 8, ends @ 36
  
  Atom mdat @ 36 of size: 45175, ends @ 45211
  
  Atom moov @ 45211 of size: 1052, ends @ 46263
  
       Atom mvhd @ 45219 of size: 108, ends @ 45327
  
       Atom trak @ 45327 of size: 839, ends @ 46166
  
           Atom tkhd @ 45335 of size: 92, ends @ 45427
  
           Atom edts @ 45427 of size: 36, ends @ 45463
  
               Atom elst @ 45435 of size: 28, ends @ 45463
  
           Atom mdia @ 45463 of size: 703, ends @ 46166
  
               Atom mdhd @ 45471 of size: 32, ends @ 45503
  
               Atom hdlr @ 45503 of size: 45, ends @ 45548
  
               Atom minf @ 45548 of size: 618, ends @ 46166
  
                   Atom vmhd @ 45556 of size: 20, ends @ 45576
  
                   Atom dinf @ 45576 of size: 36, ends @ 45612
  
                       Atom dref @ 45584 of size: 28, ends @ 45612
  
                           Atom url  @ 45600 of size: 12, ends @ 45612
  
                   Atom stbl @ 45612 of size: 554, ends @ 46166
  
                       Atom stsd @ 45620 of size: 198, ends @ 45818
  
                           Atom mp4v @ 45636 of size: 182, ends @ 45818
  
                               Atom esds @ 45722 of size: 96, ends @ 45818
  
                       Atom stts @ 45818 of size: 176, ends @ 45994
  
                       Atom stss @ 45994 of size: 24, ends @ 46018
  
                       Atom stsc @ 46018 of size: 28, ends @ 46046
  
                       Atom stsz @ 46046 of size: 100, ends @ 46146
  
                       Atom stco @ 46146 of size: 20, ends @ 46166
  
       Atom udta @ 46166 of size: 97, ends @ 46263
  
           Atom meta @ 46174 of size: 89, ends @ 46263
  
               Atom hdlr @ 46186 of size: 33, ends @ 46219
  
               Atom ilst @ 46219 of size: 44, ends @ 46263
  
                   Atom ©too @ 46227 of size: 36, ends @ 46263
  
                       Atom data @ 46235 of size: 28, ends @ 46263
  
  ------------------------------------------------------
  
  Total size: 46263 bytes; 31 atoms total. AtomicParsley from svn built on Jul 15 2014 (utf8)
  
  Media data: 45175 bytes; 1088 bytes all other atoms (2.352% atom overhead).
  
  Total free atom space: 8 bytes; 0.017% waste.
  
  ------------------------------------------------------

  I am not sure if there is anything wrong with the file itself. Can you please help me understand this ?