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• VoiceClient.play() doesn't play any audio

  13 juin 2019, par sickoofer2

  I am trying to make a music bot in discord.py, but whenever I tried to play audio using VoiceClient.play(), it never played anything, just stayed in the voice channel.

  async def play(ctx):
  
      for VoiceClient in client.voice_clients:
  
          if VoiceClient.guild == ctx.guild:
  
              await VoiceClient.play(discord.FFmpegPCMAudio('song.mp3'))
  
              embed = discord.Embed(title=f'⬅  {ctx.author.mention},  I am now playing that song.', color=0x51BDEF)
  
              await ctx.send(embed=embed)

  There weren’t any error messages either, just doesn’t play anything

• OpenCV Java binds VideoCapture from file failing silently

  8 décembre 2014, par muz0

  I’m using OpenCV 2.4.8 with the supplied Windows 64bit Java jar. I’ve been making full use of OpenCV in my current environment up until this point.

  I’m unable to open video files using the
  VideoCapture class however webcam feeds work just fine.

  The below works as expected with video.isOpened returning true

      VideoCapture video = new VideoCapture();
  
      boolean result = video.open(0);

  The below fails with video.isOpened returning false

      VideoCapture video = new VideoCapture();
  
      boolean result = video.open("res/hand-test-1.mp4");

  Neither file formats seems to make a difference (These are converted, not just renamed in hope)

      video.open("res/hand-test-1.mp4");
  
      video.open("res/hand-test-1.avi");
  
      video.open("res/hand-test-1.wmv");

  Location seems to matter not either.

      video.open("C:/hand-test-1.mp4");
  
      video.open("C:\\hand-test-1.mp4");
  
      video.open("hand-test-1.mp4");

  Neither does garbage, no exception kicked up from OpenCV through Java either, seems to fail silently.

      video.open("ashdkfhkajsjdfkhaksdf");

  PATH contains the ffmpeg directory supplied with the opencv installation,

      C:\dev\opencv\sources\3rdparty\ffmpeg

  Right now I’ve run out of ideas, it seems like whatever I throw to the native via video.open(String) will return false.

  Any help would be much appreciated

• Java Process Builder runs ffmpeg commands very slowly

  16 septembre 2022, par Mary

  I'm trying to run ffmpeg in Java using ProcessBuilder. I'm on Windows. It works fine. But not sure why it's much slower than when I just run the same command in command prompt or PowerShell.

  


  Why is it ? Is there any ways to increase the speed ?

  


  processBuilder.command("C:\\Windows\\System32\\cmd.exe", "/c","ffmpeg.exe", "-y", "-i", video,"-vf","scale=720:-1","out.mp4");
    processBuilder.redirectErrorStream(true);
    try {
                process = processBuilder.start();
                BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
                
                String line="";
                while ((line = reader.readLine()) != null) {
                        System.out.println(line);
        }
        } catch (Exception e) {
            System.err.println("Error in processBuilder. ");
        }