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• Anomalie #2729 : titre mot

  6 décembre 2012, par realet RealET

  Voir aussi http://core.spip.org/issues/2862 qui porte sur les id au lieu des titres des mots.

• Programming in C : Opening, Reading and Transcoding of Live TV with libavcodec. libavformat etc

  19 décembre 2011, par mmoment

  I'm currently developing a live streaming Software for my University Project.

  I am supposed to open a Live Video Stream from a USB Stick( I am using the Hauppauge WinTV-HVR 950Q under Linux) and read the Stream.
  Then I'm supposed to transcode it to h246. and send it to some devices in the Network.

  My Problem

  ---

  I can use the v4l API to access the USB Stick, but transcoding does currently not work as far as I know, therefore I want to use the libav to do so. I know that using the command line tools transcoding of live streams with ffmpeg is not a big deal, but doing so in C seems to be more of a problem.

  1. Here's how I open some static Video File :

     static char* path = "./video.mpeg" ;
     AVFormatContext *pFormatCtx ;

     av_register_all() ;

     if(av_open_input_file(&pFormatCtx, path, NULL, 0, NULL) !=0)
     
     printf("Opening file \"%s\" failed", path) ;
     return -1 ;
     else printf("Opening the file \"%s\" succeeded", path) ;

  2. Here's how I understand to how open a Live Feed

     static char* path = "/dev/dvb/adapter0/dvr0" ;
     AVFormatContext *pFormatCtx ;

     av_register_all() ;
     avdevice_register_all() ;

     if(avformat_open_input(&pFormatCtx, path, NULL, NULL) != 0)
     
     perror("avformat_open_input") ;
     return -1 ;
     else printf("Yay") ;

  3. Here's how I understand to how open a Live Feed

     if(av_find_stream_info(pFormatCtx)<0)
     
     printf("Could not find any Stream Information the file \"%s\"", path) ;
     return -1 ;
     
     // Dump information about file onto standard error
     dump_format(pFormatCtx, 0, path, 0) ;
     AVCodecContext *pCodecCtx ;

     // Find the first video stream
     int videoStream=-1 ;
     for(i=0 ; inb_streams ; i++)
     

     if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
     
     {
     
         videoStream=i;
     
         break;
     
     }

     if(videoStream==-1) return -1 ; // Didn't find a video stream

     // Get a pointer to the codec context for the video stream
     pCodecCtx=pFormatCtx->streams[videoStream]->codec ;

     AVCodec *pCodec ;

     // Find the decoder for the video stream
     pCodec=avcodec_find_decoder(pCodecCtx->codec_id) ;
     if(pCodec==NULL)
     
     fprintf(stderr, "Unsupported codec !\n") ;
     return -1 ; // Codec not found
     
     //Open codec
     if(avcodec_open(pCodecCtx, pCodec)<0)
     
     printf("Could not open the Codec") ;
     return -1 ; // Could not open codec
     

  So now how can you help me ?

  I would really appreciate it if anyone knew how to open a live stream and could give me a good example.

• Discord FFMPEG audio wont play from yt-dlp

  19 mars 2023, par user21236822

  My question is this : Why isn't my bot playing audio ?

  &#xA;

  I want the bot to join, play audio from queue, then disconnect without downloading an mp3 file.

  &#xA;

  I tried using youtube-dl, but I switched to the yt-dlp library after getting errors I couldn't fix.&#xA;I am running on Windows 10 locally. All my libraries are up to date.

  &#xA;

  Here are my ydl_opts and FFMPEG_OPTS :

  &#xA;

  ydl_opts = {
    'format': 'bestaudio/best',
    'postprocessors': [{
        'key': 'FFmpegExtractAudio',
        'preferredcodec': 'mp3',
        'preferredquality': '192',
    }],
}

FFMPEG_OPTIONS = {
    'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5',
    'options': '-vn'
} 


  &#xA;

  Here is where I believe the problem is.

  &#xA;

  async def play():
    print("Play Called")
    musicPlay()
    # Get message object from initial request
    message = ytLinkQue.get()
    print(f"Message object recieved: {message}")
    voiceChannel = message.author.voice.channel
    vc = await voiceChannel.connect()
    songsPlayed = 0
    
    while not ytLinkQue.empty():
        # Get current song
        currentSong = ytLinkQue.get()[0]
        print(f"Current song: {currentSong}")

        # Get song from Youtube
        with yt_dlp.YoutubeDL(ydl_opts) as ydl:
            # song = ydl.download(currentSong)
            info = ydl.extract_info(currentSong, download=False)
            song = info['formats'][0]['url']

        # Play Song
        vc.play(discord.FFmpegPCMAudio(song, **FFMPEG_OPTIONS), after=lambda e: print('Song done'))

        # Wait until the song has finished playing
        while vc.is_playing():
            print("playing rn")
            await asyncio.sleep(1)
    
    await vc.disconnect()
    musicStop()


  &#xA;

  When play() is called, here is the output in terminal with my annotations as **** text **** :

  &#xA;

  >python main.py&#xA;2023-02-17 15:21:09 INFO     discord.client logging in using static token&#xA;2023-02-17 15:21:10 INFO     discord.gateway Shard ID None has connected to Gateway (Session ID: 60b9fce14faa5daa4aed9eb6db01a74d).&#xA;Max que: 50&#xA;Text Channel: 828698708123451434&#xA;Testing Bot#4591 is ready.&#xA;Passing message object&#xA;**** play() funciton is called ****&#xA;Play Called&#xA;Message object recieved: <message channel="<TextChannel" position="7" nsfw="False" news="False"> type= author=<member discriminator="&#x27;0199&#x27;" bot="False" nick="&#x27;Fragnk7?&#x27;" guild="<Guild" chunked="True">> flags=<messageflags value="0">>&#xA;2023-02-17 15:21:16 INFO     discord.voice_client Connecting to voice...&#xA;2023-02-17 15:21:16 INFO     discord.voice_client Starting voice handshake... (connection attempt 1)&#xA;2023-02-17 15:21:17 INFO     discord.voice_client Voice handshake complete. Endpoint found seattle2004.discord.media&#xA;Current song: https://www.youtube.com/watch?v=vcAp4nmTZCA&#xA;[youtube] Extracting URL: https://www.youtube.com/watch?v=vcAp4nmTZCA &#xA;[youtube] vcAp4nmTZCA: Downloading webpage &#xA;[youtube] vcAp4nmTZCA: Downloading android player API JSON &#xA;**** Does not play any audio ****&#xA;Playing rn&#xA;Song done&#xA;2023-02-17 15:21:18 INFO     discord.player ffmpeg process 20700 successfully terminated with return code of 1.&#xA;2023-02-17 15:21:19 INFO     discord.voice_client The voice handshake is being terminated for Channel ID 400178308467392513 (Guild ID 261601676941721602)&#xA;2023-02-17 15:21:19 INFO     discord.voice_client Disconnecting from voice normally, close code 1000.&#xA;</messageflags></member></message>

  &#xA;

  On Discord's end, the bot successfully connects then disconnects after 2 second.

  &#xA;

  Note : I've only included code I think is relevant. Please let me know if I should add anything else to the post, otherwise, here is the github for the project. Code is in main.py.&#xA;https://github.com/LukeLeimbach/wallMomentMusic

  &#xA;

  Thank you in advance !

  &#xA;

  I've applied the advice from these posts but it still will not play audio :

  &#xA;

  -https://stackoverflow.com/questions/45770016/how-do-i-make-my-discord-bot-play-audio-from-youtube

  &#xA;

  -https://stackoverflow.com/questions/66070749/how-to-fix-discord-music-bot-that-stops-playing-before-the-song-is-actually-over?newreg=c70dd786cf5844e490045494223c0381

  &#xA;

  -https://stackoverflow.com/questions/57688808/playing-music-with-a-bot-from-youtube-without-downloading-the-file

  &#xA;