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• How play AVI with sound by OpenCV on Win32

  4 janvier 2015, par Andrei Shumilov

  I need play AVI by OpenCV and any sound player (vfw/ffmpeg...) on Win32. It seems to me this is very secret or useless thing ’cos I found only one sample in the world : Audio output with video processing with opencv

  Mr. Karl Phillip wrote there :
  "On my Mac I compiled it with :
  g++ ffmpeg_snd.cpp -o ffmpeg_snd -D_GNU_SOURCE=1 -D_THREAD_SAFE -I/usr/local/include/opencv -I/usr/local/include -I/usr/local/include/SDL -Wl,-framework,Cocoa ...."

  But I must use MSVS2010 (I have working project). Ok, I installed mingw to try, but still don’t know what could replace "framework,Cocoa".

  Give me please links to WORKING examples OpenCV+anysoundplayer on Win32 or help me port Karl’s example at least.

• Transloadit : How can I replace audio track of a given video ?

  1er septembre 2014, par Stan Wiechers

  I am having trouble forming the steps that would replace/set the audio track of an mp4. Here is my code :

   require "open-uri"
  
   transloadit = Transloadit.new(:key => ENV['TRANSLOADIT_AUTH_KEY'],:secret => ENV['TRANSLOADIT_AUTH_SECRET'])
  
   video_encode = transloadit.step('video_encode', '/video/encode', use: ":original",ffmpeg_stack: "v2.0.0", ffmpeg: { i: "http://www.stephaniequinn.com/Music/Allegro%20from%20Duet%20in%20C%...;", map:"1:0", vcodec:"copy", acodec:"copy"}) 
  
   store = transloadit.step('store', '/s3/store', :key => ENV['S3_ACCESS_KEY'], :secret => ENV['S3_SECRET_ACCESS_KEY'], :bucket => ENV['S3_BUCKET'])
  
   assembly = transloadit.assembly(:steps => [ video_encode, store ] )
  
   response = assembly.submit! open('http://techslides.com/demos/sample-videos/small.mp4')

  I am getting this message :

   'Unable to find a suitable output format'

  Could someone tell me how parametrize ffmpeg and transloadit to set the audio track of a given mp4 ? I tried many variations without any luck.

• ffmpeg won't start until java exits

  9 août 2014, par user3925332

  I am trying to make a java program that automatically converts wtv files in an input folder to mpg files in output folder. The twist is that I make it run periodically, so it acts as a synchronizer.

  The following code works for converting the .wtv to a .dvr-ms, which is required by ffmpeg since it cannot convert .wtv files directly.

      Process p = Runtime.getRuntime().exec("C:\\Windows\\ehome\\WTVConverter C:\\Users\\Andrew\\Desktop\\test\\input\\input.wtv C:\\Users\\Andrew\\Desktop\\test\\output\\input.dvr-ms");
  
      p.waitFor();

  WTVConverter has no problems running from a java application. ffmpeg is a different story. Once the above line runs, I then run this...

      Process p = Runtime.getRuntime().exec("ffmpeg\\bin\\ffmpeg -y -i \"C:\\Users\\Andrew\\Desktop\\test\\output\\input.dvr-ms'" -vcodec copy -acodec copy -f dvd \"C:\Users\Andrew\Desktop\test\output\input.mpg\"");
  
      p.waitFor();

  Suddenly, there is a problem... The application ffmpeg shows up in the task manager, but it’s cpu usage is 0, and no mpeg files is being generated. If I force the java application to close, though, suddenly it starts working ! Huh ?

  What reason would there be for a command line application to wait for its calling application to quit before it executes ? I’m not incredibly command line savvy, so I don’t really know how to diagnose this problem.