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• Play FFMPEG Sound Sample with OpenAL

  16 avril 2013, par Asim

  i am using FFMPEG to load Audio Video from File...with the video its working but i don't know how to play audio samples coming ... here is my routine that is getting audio samples...

  m_AdotimeBase = (int64_t(m_Adocdec_ctx->time_base.num) * AV_TIME_BASE) / int64_t(m_Adocdec_ctx->time_base.den);   
  
  if(!m_Adofmt_ctx)
  
  {
  
      //AfxMessageBox(L"m_timeBase");
  
      return FALSE ;
  
  }
  
  int64_t seekAdoTarget = int64_t(m_currFrame) * m_AdotimeBase;   
  
  
  
  
  
  if(av_seek_frame(m_Adofmt_ctx, -1, seekAdoTarget, AVSEEK_FLAG_ANY) < 0)
  
  {
  
      /*CString st;
  
      st.Format(L"%d",m_currFrame);
  
      AfxMessageBox(L"av_seek_frame "+st);*/
  
      m_currFrame = m_totalFrames-1;
  
      return FALSE ;
  
  }
  
  
  
  if ((ret = av_read_frame(m_Adofmt_ctx, &packet)) < 0)
  
          return FALSE;
  
  if (packet.stream_index == 0)       
  
  {
  
      ret = avcodec_decode_audio4(m_Adocdec_ctx, &in_AdeoFrame, &got_frame, &packet);
  
      if (ret < 0) 
  
      {
  
          av_free_packet(&packet);
  
          return FALSE;
  
      }
  
  }

  My problem is i want to listen that coming sample using OPENAL i tried hard to develop using this but won't be able .... but no success Please help mee. if u have some tutorial or refrence material plz do share with me

• Video play in slow motion while converting webm file to mp4 using ffmpeg

  14 novembre 2019, par Hardik Kothari

  I am using ffmpeg-static-electron in electron app for converting webm file to mp4 and that file will be play in mobile app as android and ios.

  Here I am using ffmpeg command for converting webm file to mp4.

    await execa(ffmpegPath, [
  
        '-i',
  
        inputPath,
  
        '-f',
  
        'mp4',
  
        '-vcodec','libx264', // video codec
  
        '-acodec','aac', // audio codec
  
        '-b:v', '6400k',  // video bitrate
  
        '-b:a', '4800k',  // audio bitrate
  
        '-strict', 'experimental', // standard
  
        '-r',
  
        '30000/1001',
  
        '-crf',
  
        '26',
  
        '-g',
  
        '16',
  
        '-movflags',
  
        'faststart',
  
        '-preset',
  
        'veryfast',
  
        outputPath,
  
      ])

  I used ’-g’ to 16 for solving a dragging progress issue in android player but it increasing the app size.
  Here you can check it out this https://video.stackexchange.com/questions/21892/why-cant-my-video-play-from-where-i-drag-the-playback-bar

  Some time It is working fine but some time sound coming through garbled and sounded like robot with slow-motion video
  Here is log file for normal video :https://textuploader.com/1o1ml

  I want a best conversion (WebM to Mp4) with lower file size.Anyone please help.

• Discord bot cannot play youtube video for more than 60sec

  18 octobre 2020, par Antoine Weber

  A few weeks back I started a discord bot as a side project for fun.
Since yesterday i've been trying to allow my bot to search youtube videos and play them in voice channels (mostly for songs).

  


  The bot correctly searches youtube with the query and finds the youtube video, starts playing it, but for some reason, after 60 sec (no matter of the video, always the same time), the bot suddenly provides no more audio, and then gets stuck somewhere (not a single error message, but the bots just stops responding).

  


  Here are the code snippets :

  


  # first two words are activation keywords for the bot, then its the youtube query
query = ' '.join(message.message.content.split()[2:])
youtube = build("youtube", "v3", developerKey=yt_token)
search_response = youtube.search().list(q=query, part="id,snippet", maxResults=5).execute()
video_id = search_response['items'][0]['id']['videoId']
video_url = "https://www.youtube.com/watch?v=" + video_id

with youtube_dl.YoutubeDL(ydl_opts) as ydl:
     ydl.download([video_url])
await play_audio(message, 'song.mp3')


  


  (I delete the song.mp3 after playing)

  


  my ydl options are

  


  ydl_opts = {
    "postprocessors":[{
        "key": "FFmpegExtractAudio", # download audio only
        "preferredcodec": "mp3", # other acceptable types "wav" etc.
        "preferredquality": "192" # 192kbps audio
    }],
    "format": "bestaudio/best",
    "outtmpl": "song.mp3"
}


  


  and also my play_audio function is

  


  async def play_audio(message, audio_name):
        channel = message.message.author.voice.channel
        vc = await channel.connect()
        time.sleep(0.5)
        vc.play(discord.FFmpegPCMAudio(audio_name))
        while vc.is_playing():
            time.sleep(1)
        vc.stop()
        await vc.disconnect()


  


  I know the time.sleep() call is blocking but I don't really core for now.

  


  Any one had this issue ? For short videos (less than 60sec), everything works fine. Maybe an ffmpeg option ?