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• 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 ?

• How to combine in ffmpeg several jpeg files with several wav files ?

  1er novembre 2020, par Gennadyi

  I have lot of jpeg file with names 01.jpeg - 225.jpeg and 10 wav files with names 17.wav - 26.wav. I need to combine them into video file with the duration of summary wav-files duration.
I tried to use command ffmpeg -r 12 -start_number 1 -i %02d.jpg -start_number 17 -i %03d.wav -c:v libx264 -pix_fmt yuv420p out.mp4 and I got error : %03d.wav : No such file or directory

  


• Include audio from FFmpeg overlay in output

  7 janvier 2020, par Andrew

  I’m using the following command to combine two video files together, overlaying the second one at a certain point in the first file. The result is what I want except the audio from the overlayed file is missing.

  ffmpeg.exe -y -hide_banner -ss 00:00:00.067 -i promo.mov -i tag.mov -filter_complex "[1:v]setpts=PTS+6.5/TB[a];[0:v][a]overlay=enable=gte(t\,6.5)[out]" -map [out] -map 0:a -map 1:a -c:v mpeg2video -c:a pcm_s16le -ar 48000 -af loudnorm=I=-20:print_format=summary -preset ultrafast -q:v 0 -t 10 complete.mxf

  Without the -map 0:a I get no audio at all, but the second -map 1:a does not pass the audio from -i tag.mov

  I have also tried amix but that combines audio from both clips starting at the beginning, and I want the audio from the second file to begin when that file starts overlaying.

  It would also be helpful if I could make the audio from the first clip drop lower at the time of the overlay.