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• Android Audio Mixing FMPEG, Mediarecorder file only merging to left channel, delayed

  12 avril 2016, par Jeremy

  working on an app that takes two sounds, and merges them together. I currently have two problems with it I cannot seem to figure out so would appreciate another set of eyes.

  1. File from MediaRecorder (voice file) merges into Left Channel Only. (I can only hear voice in left ear)

  2. The two files seem like there is a slight delay in the position as they are not aligned perfectly with the merge. Here is the method I have written.

     private void mixAudio(File mVoiceFile, File mBeatFile, File mRapFile){
     
         String files = "-i " + mVoiceFile.getAbsolutePath() + " -i " + mBeatFile.getAbsolutePath();
     
         String filter = " -filter_complex [0:a]volume=1.5[a1];[1:a]volume=0.6[a2];[a1][a2]amerge=inputs=2,volume=1.3,pan=stereo|c0code>

     }
     `

  and here is how I setup my MediaRecorder

  public void setRecorderSource(){
  
          mRapRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
  
          mRapRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
  
          mRapRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
  
          mRapRecorder.setAudioEncodingBitRate(128000);
  
          mRapRecorder.setAudioSamplingRate(44100);
  
          mRapRecorder.setAudioChannels(2);
  
          mRapRecorder.setOutputFile(mVoiceFile.getAbsolutePath());
  
  }`

• Can I compile ffmpeg using cygwin so that I would get redistributable dll's of it ?

  14 juin 2014, par Rella

  So my point is to compile ffmpeg (I know that autobuild tools or minGW can be used but I want cygwin) using gcc to have a library (like .dll or, better .lib) usable from my windows visual studio C++ appication. Is it possible and what are main instructions on how to do such thing ?

• OpenCV won't open the same videofile as opened before

  12 novembre 2013, par OpenMinded

  I have a problem to load a videofile. I am using Visual Studio 2010 and OpenCV 2.4.6.

  Sometimes it loads video properly and sometimes it won't, although it is the same file and the same code (Nothing has changed). So basically, one day it works and the next day does not. I noticed some strange behavior BEFORE.

  When I run the code I get Unhandled exception

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  and then No source available

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  A few weeks ago I wasn't able to open a video in one of my project. The problem was that if I opened a project from pinned Start menu than the video couldn't be loaded.

  

  BUT when I opened a solution right from a directory than video was loaded properly. I couldn't believe so I tried this more times.

  However, in either case it does not work this time.

  ALso, I tried to run Visual Studio as admin. Nothing.

  What could be a problem here ?