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• Add different animation for diffrent frame in video using ffmpeg android

  27 juin 2016, par Sachin Suthar

  I am trying to apply animations for the particular video frame but hereby I’m not seeing that video frame by which I have to apply the animation. I only need fade in and fade out frame and display it as slide show video. Do you have any idea about this ?

  for ex : I want to create an application like this one : https://play.google.com/store/apps/details?id=com.scoompa.slideshow

  I am using the same command which was given to this url but for the particular 5 second video hide and not getting slide show effect.

• Synchronize video subtitle with text-to-speech voice

  8 décembre 2015, par Ahmad

  I try to create a video of a text in which the text is narrated by text-to-speech.

  To create the video file, I use the VideoFileWriter of Aforge.Net as the following :

  VideoWriter = new VideoFileWriter();
  
  
  
  VideoWriter.Open(CurVideoFile, (int)(Properties.Settings.Default.VideoWidth),
  
      (int)(Properties.Settings.Default.VideoHeight), 25, VideoCodec.MPEG4, 800000);

  To read aloud the text I use SpeechSynthesizer class and write the output to a wave stream

  AudioStream = new FileStream(CurAudioFile, FileMode.Create);
  
  synth.SetOutputToWaveStream(AudioStream);

  I want to highlight the word is spoken in the video, so I synchronize them by the SpeakProgress event :

      void synth_SpeakProgress(object sender, SpeakProgressEventArgs e)
  
      {
  
  
  
          curAuidoPosition = e.AudioPosition;
  
          using (Graphics g = Graphics.FromImage(Screen))
  
          {
  
               g.DrawString(e.Text,....); 
  
          }                    
  
          VideoWriter.WriteVideoFrame(Screen, curAuidoPosition);
  
      }

  And finally, I merge the video and audio using ffmpeg

  using (Process process = new Process())
  
  {
  
            process.StartInfo.FileName = exe_path;
  
            process.StartInfo.Arguments = string.Format(@"-i ""{0}"" -i ""{1}"" -y -acodec copy -vcodec copy ""{2}""",
  
                                             avi_path, mp3_path, output_file);
  
  ......

  The problem is that for some voices like Microsoft Hazel, Zira and David, the video is not synchronized with the audio, and the audio is much faster than the shown subtitle. In windows 7, it works for Mircrosoft Sam

  How can I synchronize them so that it works for any text-to-speech voices ?

• avcodec/ac3_parser : improve false positive detection when parsing sync frames

  22 octobre 2022, par James Almer

  avcodec/ac3_parser : improve false positive detection when parsing sync frames
  A two byte sync word is not enough to ensure we got a real syncframe, nor are
  
  all the range checks we do in the first seven bytes. Do therefore an integrity
  
  check for the sync frame in order to prevent the parser from filling avctx with
  
  bogus information.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/aac_ac3_parser.c
  • [DH] libavcodec/aac_ac3_parser.h
  • [DH] libavcodec/ac3_parser.c