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• Audiotrack noisy sound from UDP socket

  12 juin 2015, par Roval

  I would like to stream wav file from my PC to any Android device using ffmpeg and AudioTrack. This is how I start my stream :

  ffmpeg  -re -i test.wav -acodec pcm_s16le -f mpegts udp://192.168.0.255:5007?broadcast=1

  And stream values are :

  Stream #0:0: Audio: pcm_s16le, 8000 Hz, stereo, s16, 256 kb/s

  Now I just receive packets from socket and I is working fine but sound has got some "glitches". I mean it makes some periodic sound every half a second.

      @Override
  
      protected Void doInBackground(Void... params) {
  
          DatagramSocket socket;
  
  
  
          track = new AudioTrack( AudioManager.STREAM_MUSIC,
  
                  8000,
  
                  AudioFormat.CHANNEL_IN_STEREO,
  
                  AudioFormat.ENCODING_PCM_16BIT,
  
                  3000,
  
                  AudioTrack.MODE_STREAM );
  
  
  
          AudioManager audio = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
  
          audio.setSpeakerphoneOn(false);
  
          audio.setMode(AudioManager.MODE_NORMAL);
  
  
  
          track.play();
  
  
  
          try {
  
  
  
              //Keep a socket open to listen to all the UDP trafic that is destined for this port
  
              socket = new DatagramSocket(5007, getBroadcastAddress());
  
              socket.setBroadcast(true);
  
  
  
              while (true) {
  
                  //Receive a packet
  
                  byte[] recvBuf = new byte[BUF_SIZE*2];
  
                  DatagramPacket packet = new DatagramPacket(recvBuf, recvBuf.length);
  
                  socket.receive(packet);
  
  
  
                  track.write(packet.getData(), 0, packet.getLength());
  
  
  
              }
  
  
  
  
  
          } catch (IOException ex) {}
  
          return null;
  
      }

  When I read the same file inside Android via BufferedImputStream from assets everything works fine, so I assume it might be some header or trash data inside packets but I don’t know what is it.

• avcodec/h2645_sei : loosen up min luminance requirements

  25 mai 2024, par Niklas Haas

  avcodec/h2645_sei : loosen up min luminance requirements
  The H.265 specification is quite clear on this case :
  > When min_display_mastering_luminance is not in the range of 1 to
  
  > 50000, the nominal maximum display luminance of the mastering display
  
  > is unknown or unspecified or specified by other means not specified in
  
  > this Specification.
  And so the current code is correct in marking luminance data as invalid
  
  if min luminance is set to 0. However, this breaks playback of at least
  
  several real-world Blu-ray releases, for example La La Land, Planet of
  
  the Apes, and quite possibly a lot more. These come with ostensibly
  
  valid max_luminance tags (1000 nits), but min_luminance set to 0.
  Loosen up this requirement by guarding it behind FF_COMPLIANCE_STRICT.
  
  We still reject blatantly invalid metadata (wrong value range on
  
  luminance, max set to 0, max below min, min above 50 nits etc.), so this
  
  shouldn't cause any unintended regressions.
  Fixes : https://github.com/mpv-player/mpv/issues/14177
  

  • [DH] libavcodec/h2645_sei.c

• ffmpeg - Overlay a text over an image

  1er mai 2020, par ark1974

  The following command line for encoding audio with an image works fine.

  



  ffmpeg -y -loop 1 -framerate 15 -i  "/storage/emulated/0/Download/Kites.jpg" -i "/storage/emulated/0/Download/myaudio.mp3"  -c:v libx264 -vf format=yuv420p -c:a aac -shortest "/storage/emulated/0/Download/Out.mp4"


  



  I want to overlay text over an image in the video frame. Based on this link, I added an overlay text like so. Since I want to use the default font, I skip the drawtext="fontfile=" command deliberately like so. But now no video frames are visible, not even the background image. How can I do it ? Thanks.

  



  ffmpeg -y -loop 1 -framerate 15 -i  "/storage/emulated/0/Download/Kites.jpg" -i "/storage/emulated/0/Download/myaudio.mp3"  -c:v libx264 -vf format=yuv420p -vf drawtext="text='Hello World': fontcolor=white: fontsize=24: box=1: boxcolor=black@0.5: boxborderw=5: x=(w-text_w)/2: y=(h-text_h)/2"   -c:a aac -shortest "/storage/emulated/0/Download/Out.mp4"