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• Android - Decoding via a pipe will not work : Could not find an ffmpeg binary for your system

  28 août 2017, par Daniele

  I’m trying to use TarsosDSP for real time pitch shifting on Android.

  This is my code :

  Uri song;
  
  // initialized in another method
  
  
  
  double rate = 1.0;
  
          RateTransposer rateTransposer;
  
          AudioDispatcher dispatcher;
  
          WaveformSimilarityBasedOverlapAdd wsola;
  
  
  
          dispatcher = AudioDispatcherFactory.fromPipe(getRealPathFromUri(song), 44100, 5000, 2500);
  
          rateTransposer = new RateTransposer(rate);
  
          wsola = new WaveformSimilarityBasedOverlapAdd(WaveformSimilarityBasedOverlapAdd.Parameters
  
                  .musicDefaults(rate, 44100));
  
  
  
          wsola.setDispatcher(dispatcher);
  
          dispatcher.addAudioProcessor(wsola);
  
          dispatcher.addAudioProcessor(rateTransposer);
  
          dispatcher.addAudioProcessor(new AndroidAudioPlayer(dispatcher.getFormat()));
  
          dispatcher.setZeroPadFirstBuffer(true);
  
          dispatcher.setZeroPadLastBuffer(true);

  I get an error here

  dispatcher = AudioDispatcherFactory.fromPipe(getRealPathFromUri(song), 44100, 5000, 2500);

  Decoding via a pipe will not work : Could not find an ffmpeg binary for
  your system

  Why does this happen and how should I fix it ?

  EDIT :

  As far as I was able to understand it’s because ffmpeg isn’t integrated within the app. I looked for a guide here on SO but I couldn’t find any updated one. Using NDK r15c and FFmpeg 3.3.3

• Gstreamer restream incoming UDP stream

  3 août 2017, par Viezevingertjes

  I am currently experimenting with some streaming, yet i can’t really find the golden combination. RTSP UDP streaming from Gstreamer seems very fast, i can recieve it too, but i need to restream it as mpeg1 over http.

  I use this currently and it works fine :

  ffmpeg \
  
  -f v4l2 \
  
      -framerate 25 -video_size 640x480 -i /dev/video0 \
  
  -f mpegts \
  
      -codec:v mpeg1video -s 640x480 -b:v 1000k -bf 0 \
  
  http://localhost:8081/supersecret

  The server accepts this and it’s showing perfectly in the browser.

  Now i would like to try the same, with GStreamer so i can send it to the server over UDP.

  I get the video from Gstreamer like this on the server and that works perfectly :

  gst-launch-1.0 udpsrc port=5000 \
  
      ! gdpdepay \
  
      ! rtph264depay \
  
      ! avdec_h264 \
  
      ! videoconvert \
  
      ! autovideosink sync=false

  But after recieving it, i need to re-stream it as mpeg1 stream to http://localhost:8081/supersecret.

  Any way to do this with gstreamer ?

• Invalid data found when processing input ffmpeg and video trimmed to 1 second

  3 août 2017, par Prashant Sharma

  I am stuck on my code.
  This is my command of ffmpeg through which I am pasting texts on particular video.

  Code in Java :

  try {
  
      char double_quote = '\"';
  
      String devajuserif_font = "DejaVuSerif.ttf";
  
      Date date1 = new Date(Long.parseLong(date));
  
      SimpleDateFormat df2 = new SimpleDateFormat("dd/MM/yy");
  
      date = df2.format(date1);
  
      String videoEditingCommand = "ffmpeg -i " + file.getAbsolutePath() + " -vf " + double_quote
  
                  + "[in]drawtext=fontsize=10:fontcolor=Red:fontfile=" + devajuserif_font + ":text=Latitude-'" + latitude
  
                  + "':x=0:y=0, drawtext=fontsize=10:fontcolor=Red:fontfile=" + devajuserif_font + ":text=Longitude-'"
  
                  + longitude + "':x=0:y=10, drawtext=fontsize=10:fontcolor=Red:fontfile=" + devajuserif_font
  
                  + ":text=Accuracy-'" + accuracy + " m':x=0:y=20, drawtext=fontsize=10:fontcolor=Red:fontfile="
  
                  + devajuserif_font + ":text=Date-'" + date + "':x=0:y=30[out]" + double_quote + " -y "
  
                  + file.getAbsolutePath();
  
          ProcessBuilder builder = new ProcessBuilder("cmd.exe", "/c", videoEditingCommand);  //for windows
  
          builder.redirectErrorStream(true);
  
          Process p = builder.start();
  
          BufferedReader r = new BufferedReader(new 
  
          InputStreamReader(p.getInputStream()));
  
          String line;
  
          while (true) {
  
              line = r.readLine();
  
              if (line == null) {
  
                  break;
  
              }
  
              log.info(line);
  
          }
  
      } 

  My video length is 1 minute. But after conversion, When I download video after pasting text on video, It’s length reduces to 1 second. It is getting error.
  says :

  Invalid NAL unit size (755 > 249).
  D :\test\upload21-3Aug2017061732GMT_1501741052377.mp4 : Invalid data
  found when processing input

  Can someone help me ?