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• ffmpeg highest quality mp4 to mpg

  29 septembre 2017, par scopa

  I have a mp4 video that I need to convert to mpg (for windows PowerPoint2010)

  I have been trying to get best quality. But I keep getting error :

  [mpeg @ 0x2523620] buffer underflow st=0 bufi=420177 size=445860
  
  [mpeg @ 0x2523620] packet too large, ignoring buffer limits to mux it
  
  [mpeg @ 0x2523620] buffer underflow st=0 bufi=420177 size=445860
  
  [mpeg @ 0x2523620] buffer underflow st=0 bufi=422218 size=445860

  Could someone help me with the syntax for best quality ouput to mpg. Here is the output of the mp4 file :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp41isom
  
      creation_time   : 2016-06-10 11:15:06
  
    Duration: 00:04:20.86, start: 0.000000, bitrate: 18677 kb/s
  
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080, 18541 kb/s, 29.97 fps, 29.97 tbr, 29970 tbn, 59.94 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-06-10 11:15:06
  
        handler_name    : VideoHandler
  
        encoder         : AVC Coding
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 132 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-06-10 11:15:06
  
        handler_name    : SoundHandler

  I have tried the following but keep getting that error :

  ffmpeg -i video.mp4 -c:v libx264 -c:a copy -qp 5 video.mpg
  
  ffmpeg -i video.mp4 -c:v libx264 -c:a copy -qscale:v 1 video.mpg
  
  ffmpeg -i video.mp4 -c:v libx264 -crf 0 -c:a copy -bf 2 -flags qprd -flags mv0 video.mpg
  
  ffmpeg -i video.mp4 -c:v libx264 -crf 0 -c:a copy video.mpg
  
  ffmpeg -i video.mp4 -c:v libx264 -preset slow -crf 5 -c:a copy video.mpg
  
  ffmpeg -i video.mp4 -c:v libx264 -preset slow -crf 5 -c:a copy -maxrate 11000k video.mpg
  
  ffmpeg -i video.mp4 -c:v libx264 -preset slow -crf 5 -c:a copy -maxrate 5000 -bufsize 11000 video.mpg

  Thanks,

• 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 ?