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• SoX - Remove noise only in silences

  15 mars 2019, par fireDevelop.com

  Please, I need to clean ONLY the noise in the silences of hundreds podcast, NOT in the audio voice. To do this I use this script :

  # First denoise audio
  
  
  
  ## Get noise sample
  
  ffmpeg -i in.wav -vn -ss 00:00:00 -t 00:00:01 noise-sample.wav
  
  
  
  ## Create noise profile
  
  sox noise-sample.wav -n noiseprof noise.prof
  
  
  
  ## Clean audio from noise
  
  sox in.wav clean.wav noisered noise.prof 0.21
  
  
  
  # Split audio by noise
  
  sox -V3 clean.wav output.wav silence 1 0.2 0.4% 1 0.2 0.4% : newfile : restart
  
  
  
  ####### (these settings worked for my computer mic - maybe we need to finetune them later) #######

  Here you can see my audio :
  My audio
  Please how can I said to the script don’t touch the audio voice ? If I run this script the audio voice is affected by the filter, and I want keep intact because sound good.

  Note, I don’t want a complete silence like -60db, I prefer keep some silence room, like gssgsssgsssss :)

  Thanks so much.

• Removing lagspikes in video with using mpdecimate in FFmpeg

  2 novembre 2020, par Stratos2 - no videos here

  I frequently deal with .mp4 footage files which are game recordings from my computer. Because I'm dealing with a laggy game I end up with footage that has both duplicate frames and a variable frame rate. I want to cut out lagspikes from my video, lagspikes that can have the form of variable frame rates and/or duplicate frames. The end goal is to have video with a constant frame rate and no more lagspikes.
I'm well aware that this will destroy or at least damage the audio, but keeping the audio intact is not necessary for my application.

  


  I have come across the mpdecimate filter for FFmpeg. As far as I have seen this is able to remove duplicate frames, however it does this in a way that does not make the output file a shorter video, but it introduces more variable frame rate.

  


  Is it possible to reach my goal with FFmpeg ? And if so, how ?

  


  Thanks in advance for help !

  


• How do I use -analyzeduration from ffmpeg with FFmpegDecoder.framework from mooncatventures ?

  29 décembre 2013, par user3143010

  I have been playing with the RtspPlay1 from mooncatventures to try and stream a live stream from an ffmpeg streaming source with as little delay as possible. The problem is even when I modify the code to indicate the -analyzedelay 0 flags in RtspPlay1 it does not seem to do anything. I came to this conclusion because the delay is the same on my computer without the -analyzeduration 0 flag as the iOS device. Any thoughts would be helpful.

  Here is the command I am trying to emulate on the iPhone :
  ffplay rtp :///224.1.1.1:11326 -analyzeduration 0

  Here is the modified code I tried with RtspPlay1 :

  forward_argc=1;
  
  
  
  forward_argv[1] = "-analyzeduration";
  
  forward_argv[2] = "0";
  
  //forward_argv[3] = "30";
  
  //forward_argv[4] = "-fast";
  
  //forward_argv[5] = "-sync";
  
  //forward_argv[6] = "video";
  
  //forward_argv[7] = "-drp";
  
  //forward_argv[8] = "-skipidct";
  
  //forward_argv[9] = "10";
  
  //forward_argv[10] = "-skiploop";
  
  //forward_argv[11] = "50";
  
  //forward_argv[12] = "-threads";
  
  //forward_argv[13] = "5";
  
  //argv[14] = "-an";
  
  forward_argv[3] = cString;
  
  
  
  NSLog(@"glflag %@\n ",[parms objectForKey:@"glflag"] );
  
  if ([parms objectForKey:@"glflag"]!=@"1") {
  
     forward_argv[4]="0";
  
  }else {
  
  forward_argv[4]="1";
  
  }
  
  
  
  
  
  forward_argc += 4;