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• optimizing ffmpeg in windows platform for processing with web-cam

  22 août 2013, par user2320537

  I have to develop a tool in java that will capture frames from webcam, Now what I have done for that is, I have used Runtime class to run ffmpeg and other commands, when it starts capturing frames from my web-cam,
  I am using following method for that.

  public class FFMPEGClass {
  
  
  
      private String ffmpegExeLocation, line;
  
      private final String FRAME_DIGITS = "010";
  
  
  
      public FFMPEGClass(String capturingDName, String outputImagesLocation, int framesPerSecond) {
  
          ffmpegExeLocation = System.getProperty("user.dir") + "\\bin\\";
  
          System.out.println(ffmpegExeLocation);
  
          try {            
  
              System.out.println(ffmpegExeLocation + "ffmpeg -t 100000 "
  
                      + "-f vfwcap -s 640x480 -i 0 -r 1/" + framesPerSecond + " -f image2 " + outputImagesLocation + "\\camera%"+FRAME_DIGITS+"d.jpg");
  
              Process pp = Runtime.getRuntime().exec(ffmpegExeLocation + "ffmpeg -t 100000 "
  
                      + "-f vfwcap -s 640x480 -i 0 -r 1/" + framesPerSecond + " -f image2 " + outputImagesLocation + "\\camera%"+FRAME_DIGITS+"d.jpg");
  
              BufferedReader br = new BufferedReader(new InputStreamReader(pp.getErrorStream()));
  
              while((line = br.readLine()) != null){
  
                   System.out.println(line);
  
              }
  
          } catch (Exception ex) {
  
              ex.printStackTrace();
  
          }
  
      }
  
  }

  In my case capturingDName is USB2.0 UVC VGA WebCam
  outputImagesLocation is e :\myfolder\frames and
  framesPerSecond is 10

  This code works well but it is unable to capture frames efficiently, In other words I want to say that its processing is very slow, can anyone please tell that how can I optimize it so that it can capture frames very fastly.

  I have Intel Core i3 processor with 6 GB of RAM

  I have already checked many answers from google and stackoverflow but these are not working in my case

• muxing overhead error when converting a video via ffmpeg

  16 décembre 2016, par john smoth

  I’m using ffmpeg to converting videos on my site.
  I’m converting all the videos to flv . if I upload flv , it has not problem but if I upload any other file type except flv , it shows me this error :

  ffmpeg version 0.7.11, Copyright (c) 2000-2011 the FFmpeg developers built on Jul 26 2013 01:58:02 with gcc 4.4.7 20120313 (Red Hat 4.4.7-3) 
  
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-shared --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-libvorbis 
  
  --enable-libopencore-amrnb --enable-libopencore-amrwb libavutil 50. 43. 0 / 50. 43. 0 libavcodec 52.123. 0 / 52.123. 0 libavformat 52.111. 0 / 52.111. 0 
  
  libavdevice 52. 5. 0 / 52. 5. 0 libavfilter 1. 80. 0 / 1. 80. 0 libswscale 0. 14. 1 / 0. 14. 1 libpostproc 51. 2. 0 / 51. 2. 0 
  
  Seems stream 0 codec frame rate differs from container frame rate: 2997.00 (2997/1) -> 14.99 (15000/1001) 
  
  Input #0, avi, from 'uploads/v_37.avi': 
  
  Metadata: title : AJ McLean - Teenage Wildlife encoder : Lavf52.16.0
  
  Duration: 00:04:17.19, start: 0.000000, bitrate: 470 kb/s 
  
  Stream #0.0: Video: mpeg4, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 14.98 fps, 14.99 tbr, 14.99 tbn, 2997 tbc 
  
  Stream #0.1: Audio: mp3, 22050 Hz, stereo, s16, 128 kb/s 
  
  WARNING: The bitrate parameter is set too low. It takes bits/s as argument, not kbits/s 
  
  [buffer @ 0x2137ae0] w:640 h:480 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param: [scale @ 0x2139da0] w:640 h:480 fmt:yuv420p -> w:320 h:240 fmt:yuv420p flags:0x4 
  
  Output #0, flv, to 'uploads/aaa.flv': Metadata: title : AJ McLean - Teenage Wildlife encoder : Lavf52.111.0 
  
  Stream #0.0: Video: flv, yuv420p, 320x240 [PAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 1k tbn, 14.99 tbc Stream #0.1: Audio: libmp3lame, 22050 Hz, stereo, s16, 0 kb/s 
  
  Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 
  
  Press [q] to stop, [?] for help 
  
  frame= 26 fps= 0 q=2.0 Lsize= 80kB time=00:00:01.73 bitrate= 375.7kbits/s video:64kB audio:14kB global headers:0kB muxing overhead 2.339835%

  last line is : muxing overhead 2.339835%

  the final file is a 1 second video ( it doesn’t make any different how long is the video , all of them become a 1 second video )

  What is the problem ?
  this is the ffmpeg code that convert the video :

  echo passthru("$ffmpegpath -i uploads/$file -ar 22050 -ab 32 -f flv -s 320×240 uploads/aaa.flv 2>&1");

  Thanks

  thanks

• 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