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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 ?

• ffmpeg overlay video with audio

  2 août 2017, par ravindu1024

  I have two video files : input.mp4 (55seconds) and overlay.mp4 (10seconds). I need to overlay the overlay.mp4 on input.mp4 between 00:00:5 and 00:00:15 with both audio streams audible.
  I am using this command and everything seems to work ok but its causing a buffer overflow and causes the overlaid video to freeze and flicker. What am I doing wrong here ?

  ffmpeg -i input.mp4 -i overlay.mp4 -strict -2 -filter_complex
  
  "[0:v]setpts=PTS-STARTPTS[v0];
  
   [1:v]setpts=PTS-STARTPTS+5/TB[v1];
  
   [v0][v1]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:eof_action=pass[outv];
  
   [1:a]adelay=5000[a1];
  
   [0:a][a1] amix [outa]"
  
   -map [outv] -map [outa] out.mp4

  Log :

  Output #0, mp4, to 'out.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        encoder         : Lavc56.60.100 libx264
  
      Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc56.60.100 aac
  
  Stream mapping:
  
    Stream #0:0 (h264) -> setpts
  
    Stream #0:1 (aac) -> amix:input0
  
    Stream #1:0 (h264) -> setpts
  
    Stream #1:1 (aac) -> adelay
  
    overlay -> Stream #0:0 (libx264)
  
    amix -> Stream #0:1 (aac)
  
  Press [q] to stop, [?] for help
  
  [Parsed_overlay_2 @ 0x169afe0] [framesync @ 0x169b128] Buffer queue overflow, dropping.
  
      Last message repeated 1 times
  
  [Parsed_overlay_2 @ 0x169afe0] [framesync @ 0x169b128] Buffer queue overflow, dropping.
  
      Last message repeated 13 times
  
  [Parsed_overlay_2 @ 0x169afe0] [framesync @ 0x169b128] Buffer queue overflow, dropping