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• h264 : move initing the implicit pred weight table out of h264_slice_header_parse()

  14 avril 2016, par Anton Khirnov

  h264 : move initing the implicit pred weight table out of h264_slice_header_parse()
  It depends on the reference list, so this will allow moving out the
  
  reference list construction and consequently other code it depends on.
  

  • [DBH] libavcodec/h264_slice.c

• discord.py. FFmpegPCMAudio. Applying filters to running source FFmpeg sub-procces

  23 janvier 2024, par Vladimir Blanven

  How can I apply a new filter (e.g. the same afade) to source, after running voice.play(source) at any time, without killing the current one and creating a new ffmpeg sub-process ? For instance the user will call a voice.pause() command, after which the afade=t=out filter will be applied to the current timestamp, and only then will the source audio be stopped.

  


  start_time = datetime.now()
audio_path = os.path.join(CURRENT_DIRECTORY, MUSIC_FOLDER_NAME, audiofile)
audio_long = MP3(audio_path)
end_time = int(audio_long.info.length)
before_options= f'-ss 0:00:00'
options = f'-af "afade=t=in:st=0:d={FADE_DURATION}, afade=t=out:st={end_time-FADE_DURATION}:d={FADE_DURATION}"'
source = discord.PCMVolumeTransformer(discord.FFmpegPCMAudio(source=audio_path, executable=FFMPEG_EXECUTABLE_FILE_PATH, before_options=before_options, options=options))
voice.play(source)


  


  For now I have this kinda premitive sort of construction (simulating linear afade=t=out effect) :

  


  volume = 1.0
for _ in range(FADE_DURATION * 10):
    volume -= (1.0 / (FADE_DURATION * 10.0)
    voice.source.volume = volume
    await asyncio.sleep(SLEEP_DURATION)


  


• 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 ?