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• How to increase speed of ffmpeg stream when running in cli assuming streaming over network

  28 juin 2020, par VRu11ra

  I'd like to increase the speed of playback so that I can catch up to whatever the newest available audio packet is. Using PulseAudio on archlinux for server, client uses windows although that really shouldn't matter.

  


  Server commands issued :

  


  pactl load-module module-null-sink sink_name=remote
ffmpeg -f pulse -i "remote.monitor" -ac 2 -acodec pcm_s16le -ar 48000 -f s16le "udp://{LAN_IP_OF_CLIENT}:{PORT}"


  


  Client command issued :

  


  ffplay.exe -nodisp -ac 2 -acodec pcm_s16le -ar 48000 -analyzeduration 0 -probesize 32 -f u8 -i udp://0.0.0.0:{PORT}


  


  Current setup is using pavucontrol to put the audio output to the pactl sink from firefox and just keeping the cli application running somewhere. Often times the network is slow, and the audio will grow an increasingly noticable lag behind whatever is onscreen. When I re-execute the commands on both server and client it catches up. If possible I'd like to keep up with whatever's being broadcast- I figure the simplest solution is to nudge the playback speed a little faster than audio is being sent over so that in the mid-long term it will fix itself.

  


  If there's just a way to discard audio packets that aren't the newest ones and jump ahead when possible I'd prefer that as a solution- I know too little about ffmpeg to know if that's possible to do easily.

  


• Revision 7b7c843870 : Add utiltest target to Makefile. Add target for running tests via make. Runs vp

  22 avril 2014, par Tom Finegan

  Changed Paths :
   Modify /build/make/Makefile

  
   Modify /libs.mk

  
  
  Add utiltest target to Makefile.

  Add target for running tests via make. Runs vpxdec.sh and vpxenc.sh.

  Change-Id : I5fddb7356b6ac37e284b4f15b47310f108ae3da3

• running ffmpeg command in java Process hangs in waitFor()

  9 juin 2015, par Mahesha M

  I’m running ffmpeg command to generate video for given images (img001.jpg, img002.jpg ...) it’s creating slide.mp4, but it waits infinitely :

  public class Ffmpeg {
  
  
  
  public static void main(String[] args) throws IOException, InterruptedException {
  
      String path = "E:\\pics\\Santhosh\\FadeOut\\testing";       
  
      String cmd = "ffmpeg -r 1/5 -i img%03d.jpg -c:v libx264 -r 30 -y -pix_fmt yuv420p slide.mp4";
  
      runScript (path, cmd);
  
  }
  
  
  
  private static boolean runScript(String path, String cmd) throws IOException, InterruptedException {       
  
      List<string> commands = new ArrayList<string>();
  
      commands.add("cmd");
  
      commands.add("/c");
  
      commands.add(cmd);
  
      ProcessBuilder pb = new ProcessBuilder(commands);
  
      pb.directory(new File(path));
  
      pb.redirectErrorStream(true);
  
      Process process = pb.start();   
  
      flushInputStreamReader(process);                
  
      int exitCode = process.waitFor();
  
      return exitCode == 0;
  
  }    
  
  }
  
  
  
  private static void flushInputStreamReader (Process process) throws IOException, InterruptedException {
  
              BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStream()));
  
              String line=null;
  
              StringBuilder s = new StringBuilder();
  
              while((line=input.readLine()) != null) {            
  
                  s.append(line);
  
              }
  
          }
  
  </string></string>

  Any suggestions ?

  After writing the function flushInputStreamReader, its working