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• Revision c2876cf0fd : Initial addition of multiple ARF frames This is work-in-progress, it implements

  3 avril 2013, par Adrian Grange

  Changed Paths : Modify /configure Modify /vp8/encoder/onyx_if.c Modify /vp9/common/vp9_onyxc_int.h Modify /vp9/decoder/vp9_onyxd_if.c Modify /vp9/encoder/vp9_bitstream.c Modify /vp9/encoder/vp9_firstpass.c Modify /vp9/encoder/vp9_onyx_if.c (...)

• ffmpeg - how does moving overlay / text command work ?

  7 mars 2015, par Stpn

  In Ffmpeg you can create moving text :

  ffmpeg -y -t 10 -s qcif -f rawvideo -pix_fmt rgb24 -s 1280x720 -i /dev/zero -g 1 -r 24 -vf drawtext="fontfile=~/fonts/Trebuchet_MS.ttf:text='thing crawls':fontsize=155:fontcolor=red:y=h-20*t" wow.mpg

  So this will give me a black frame with "thing crawls" slowly going from bottom up..

  If I know the length of the video (20 seconds) and want to, for example create "thing falls" that starts at the top of the screen at time 0 and goes to the bottom of the screen until 00:00:20, how do I do that ?

  Also can I create the situation where the text will start going from top to bottom, but stop at the middle of the screen ?

• Can somebody say why that doesn't work

  6 août 2018, par atif sesu

  I want to convert webm to mp4.

  private String ffmpegApp;
  
  
  
  public FLVConverter(String ffmpegApp) {
  
      this.ffmpegApp = ffmpegApp;
  
  }
  
  
  
  public void convert(String filenameIn, String filenameOut, int width, int height) throws IOException, InterruptedException {
  
      convert(filenameIn, filenameOut, width, height, -1);
  
  }
  
  
  
  public int convert(String filenameIn, String filenameOut, int width, int height, int quality)
  
          throws IOException, InterruptedException {
  
      ProcessBuilder processBuilder;
  
      if (quality > -1) {
  
          processBuilder = new ProcessBuilder(ffmpegApp, "-i", filenameIn, "-ar", "44100",
  
                  "-s", width + "*" + height, "-qscale", quality + "", filenameOut);
  
      } else {
  
          processBuilder = new ProcessBuilder(ffmpegApp, "-i", filenameIn, "-ar", "44100",
  
                  "-s", width + "*" + height, filenameOut);
  
      }
  
  
  
      Process process = processBuilder.start();
  
  
  
      InputStream stderr = process.getErrorStream();
  
      InputStreamReader isr = new InputStreamReader(stderr);
  
      BufferedReader br = new BufferedReader(isr);
  
      String line;
  
      while ((line = br.readLine()) != null) ;
  
  
  
      {
  
      }
  
  
  
      return process.waitFor();
  
  }
  
  
  
  public static void main(String[] args) throws Exception {
  
      FLVConverter FLVConverter = new FLVConverter("C:\\Users\\Casper\\Desktop\\ffmpeg\\bin\\ffmpeg.exe");
  
      FLVConverter.convert("C:\\Users\\Casper\\Desktop\\videoplayback.webm",
  
              "C:\\Users\\Casper\\Desktop\\a.mp4", 300, 200, 5);
  
  }