Recherche avancée

Sur d’autres sites (4096)

• Apply sound effects on a video file

  31 mars 2013, par talhamalik22

  I am a little miss guided here and it seems i am totally lost. I am developing an android app and its core idea is to develop a video recorder and video player that applies some sound effects on the voice of the people or any sound that it records. Sound effect means that if i make a video of a person who is giving some speech then there should be no effect on video but his/her voice should appear like voice in talking tom cat app. I hope you understand the idea. Similar app is Helium Booth you can check it here. I am trying to use libraries like libSonic, libpd and tried to use XUGGLE too.
  Read somewhere that Xuggle is not really developed for mobile devices so left it. Now what i want is that it should apply this effect on voice on the run time i.e while recording the pitch of the sound should be alterd and saved immediately. And what i am getting with these libraries is that i can apply sound effect after video is recorded. So it means i need to rip the audio from the video and then apply the change in pitch and frequency and again concatenate this audio file with the old video file. And i have no idea how to do it.
  Please show me the right approach and tools if possible.

  Regards

• EmguCV capture rtsp ip camera stream ffmpeg

  2 février 2018, par Mr Neo

  I am working with IP camera and EmguCV to detect person in an area.
  Everything is work normally with Highgui capture source.
  But with Arlo camera which use FFMPEG format, I am unable to get stream without any exception.
  Here is the code I have tried :

  if (capture == null)
  
          {
  
              try
  
              {
  
                  capture = new Capture("rtsp://<ip>:8554/live"); 
  
                  capture.ImageGrabbed += Capture_ImageGrabbed;
  
                  capture.Grab();
  
                  capture.Start();
  
              }
  
  
  
  
  
              catch (NullReferenceException exception)
  
              {
  
                  MessageBox.Show(exception.Message);
  
              }
  
              catch (TypeInitializationException exc)
  
              {
  
                  MessageBox.Show(
  
                     "Attention: You have to copy all the assemblies and native libraries from an official release of EmguCV to the directory of the demo." +
  
                     Environment.NewLine + Environment.NewLine + exc);
  
              }
  
  }
  
  </ip>

  and here is Capture_ImageGrabbed event which is not fired.

  private void Capture_ImageGrabbed(object sender, EventArgs e)
  
      {
  
          Mat image = new Mat();
  
          capture.Retrieve(image);
  
          picCAM.Image = image.Bitmap;
  
      }

  Thanks so much for your help !

• How to change ffmpeg -threads settings [migrated]

  5 août 2014, par Jacob

  Working on a tube site. I’m running videos through ffmpeg on a linux dedicated server to convert to mp4.

  The server specs :

  Architecture:          x86_64
  
  CPU op-mode(s):        32-bit, 64-bit
  
  Byte Order:            Little Endian
  
  CPU(s):                8
  
  On-line CPU(s) list:   0-7
  
  Thread(s) per core:    2
  
  Core(s) per socket:    4
  
  Socket(s):             1
  
  NUMA node(s):          1
  
  Vendor ID:             GenuineIntel
  
  CPU family:            6
  
  Model:                 60
  
  Stepping:              3
  
  CPU MHz:               3491.749
  
  BogoMIPS:              6983.49
  
  Virtualization:        VT-x
  
  L1d cache:             32K
  
  L1i cache:             32K
  
  L2 cache:              256K
  
  L3 cache:              8192K
  
  NUMA node0 CPU(s):     0-7

  Issue during testing is that even only doing 4-5 at once, the server load skyrockets to an average of around 36. This is just a single person. I imagine when it opens, many people will be uploading at once.

  It seems ffmpeg tries to use all the resources available per conversion.

  I’ve heard there’s a -threads setting you can change, but I cannot find it. I have an 8 cpu server. It’s only used for conversions, so I’ve heard the best setting would be between 2 and 4. I can test it out.

  But how do I change this setting ? Everything I see online discusses this setting, but not the steps to change it.