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• Normalize Fish Eye Video

  19 novembre 2016, par Optonom Scientific

  I use more advance super fish eye lens. Unfortunately, I couldn’t find any technical properties of this lens.

  I want to dewrap with ffmpeg software with this command :

  ffmpeg -i left.MP4 -vf lenscorrection=cx=0.055:cy=0.005:k1=-.2:k2=-.2 new1.mp4

  In lenscorrection filter there are four parameters.

  How can I find right value for my lens ?

• how to use guardianproject's android ffmpeg library ?

  21 octobre 2013, par Blaze Tama

  First, this is my first time "playing" with ffmpeg, so please bear with me.

  Generally, i dont understand ffmpeg even a little bit. So i did lot, lot of researches (and also trial & error) and i finally found this project and its library

  So i was successfully created the ffmpeg and sox binary file, and i put it in the raw folder at the library project (from the link i shared).

  Now, i want to use the library for my project, but i still cant do it. I tried to use some methods in the FfmpegController like combineAudioAndVideo and more but its not working (yet).

  I dont post the error here since i still do my trial&errors (and the error change regularly) but im getting tired now.

  EDIT

  This is what i did :

  private FfmpegController ffController;
  
  
  
      @Override
  
      protected void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_main);
  
  
  
          File file = new File(Uri.parse("android.resource://com.my.package/" + R.raw.test).getPath());
  
          try {
  
              ffController = new FfmpegController(this, file);
  
          } catch (FileNotFoundException e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          } catch (IOException e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          }
  
  
  
          MediaDesc desc = ffController.combineAudioAndVideo(R.raw.test, R.raw.musictest, "test.mp4", null);
  
      }

  The combineAudioAndVideo always error because wrong parameters. It needs MediaDesc but i dont know how to do it.

  I will be very happy if you can share your working code if you have done the ffmpeg processing with this library.

• Renaming carrierwave extension before process ends

  6 septembre 2013, par Jan

  I have an audiofile which gets uploaded via carrierwave. I wanna rename the current_file before it gets processed.

  When I do processing a version, normally I rewrite the file extension via

  def full_filename(for_file=file)
  
    super.chomp(File.extname(super)) + '.mp3'
  
  end 

  but this will be executed after the version creation process.

  How can I make a version and renmame it before it gets saved.

  To be more concret :

  I am converting an WAV file to a MP3 by using ffmpeg.

  FFMPEG needs an inputfile (-i inputfile.wav) and and outputfilename which needs the mp3 fileextension to process an mp3. (output.mp3 in my case)

  How can I rename the extension before it get's saved ?

  ffmpeg -i inputfile.wav -acodec libmp3lame -f mp3 watermarked.mp3
  
           HOW CAN I RENAME THE EXTENSTION BEFORE IT GET SAVED? ^^^

  The above snip (-f forcing the codec and format) does NOT it's job and

  def full_filename(for_file=file)
  
    super.chomp(File.extname(super)) + '.mp3'
  
  end 

  is happening too late (done after processing)

  How can I rename the temporary Carrierfile name ?