Recherche avancée

Sur d’autres sites (3576)

• How to work with data received from streaming services in my Java application ?

  24 novembre 2020, par gabriel garcia

  I'm currently trying to develop an "streaming client" as a way to organize multiple stream services (twitch, yt, mitele...) in a single desktop application written in Java.

  


  It basically relies on streamlink (which relies in ffmpeg) thanks to all it's features so my project could be defined as a frontend for streamlink.

  


  Straight to the point, one of the features I'd like to add it is the option to programatically record streams in the background and showing this video stream to the user when it's requested. Since there's also the possibility that the user wants to watch the stream without recording it, I'm forced to work with all that byte-like data sent from those streaming sources.

  


  So, the problem is basically that I do not know much about video coding/decoding/muxing/demuxing nor video theory like container structure, video formats and such.

  


  But the idea is to work with all the data sent from the stream source (let's say twitch, for example), read this bytes (I'm not sure what kind of information is sent to the client nor format) from the java.lang.Process's stdout and then present it to the client.

  


  Here's another problem : I don't know how to play video streams in JavaFX and I don't think it's even supported right now. So I would have to extract each frame and sound associated from the stdout and show them to the user each time a new frame is received (oups, another problem since I don't know when does each frame starts/ends since I'm reading each stdout's line).

  


  As a summary :

  


  

  • What kind of data am I receiving from the streaming source ?

  


  • How can I know when does each frame starts/stops ?

  


  • How can I extract the image and sound from each frame ?

  


  


  I hope I'm not asking too much and that you could shed some light upon my darkness.

  


• FFProbe doesn't work in Android Phone

  24 février 2018, par Royal.O

  Argument ’/storage/emulated/0/Watermark/test.flv’ provided as input filename, but ’ffprobe’ was already specified.
  compile ’nl.bravobit:android-ffmpeg:1.1.1’

             String [] command = {"ffprobe", videoPath };
  
             FFprobe ffprobe = FFprobe.getInstance(this);
  
  
  
              try {
  
              ffprobe.execute(command, new ExecuteBinaryResponseHandler() {
  
  
  
                  @Override
  
                  public void onSuccess(String message) {
  
                      addTextViewToLayout("SUCCESS with output : "+ message);
  
                      Logger.print("onSuccess : "+message);
  
  
  
                  }
  
                  @Override
  
                  public void onProgress(String message) {
  
                      addTextViewToLayout("Started command : ffmpeg "+command);
  
                      addTextViewToLayout("progress : "+message);
  
                      Logger.print("Started command : ffmpeg "+command.toString());
  
                      Logger.print("progress : "+message);
  
                  }
  
  
  
                  @Override
  
                  public void onFailure(String message) {
  
                      Logger.print("FAILED with output : "+message);
  
                  }
  
  
  
                  @Override
  
                  public void onStart() {
  
                      Logger.print("onStart");
  
                  }
  
  
  
                  @Override
  
                  public void onFinish() {
  
                      Logger.print("onFinish");
  
                  }
  
  
  
              });
  
          } catch (FFprobeCommandAlreadyRunningException e) {
  
              e.printStackTrace();
  
          }
  
  
  
  
  
      }

  ffprobe works good in Windows, Mac, Ubuntu but doesn’t work in Android.

  If anybody experienced please share me your experience.

• Revision 49cf335e7f : Improve loopfilter function This patch continued the work done in "Rewrite loop

  1er novembre 2013, par Yunqing Wang

  Changed Paths :
   Modify /vp9/common/vp9_loopfilter.c

  
  
  Improve loopfilter function

  This patch continued the work done in "Rewrite loop_filter_info_n
  struct"(commit:00dbd369c70270428d56da6d15ea5486fc821c52) to further
  improve loopfilter function.

  1. Instead of storing pointers to thresholds, store loopfilter
  levels within 64x64 SB ;
  2. Since loopfilter levels are already calculated in setup_mask,
  we don't need call build_lfi to look up them again. Just save
  loopfilter levels in setup_mask.
  3. Reorganized and simplified filter_block_plane().

  Tests showed a 0.8% decoder speedup.

  Change-Id : I723c7779738bbc2afcb9afa2c6f78580ee6c3af7