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• how to play m4s chunks downloaded from mpd file

  28 août 2015, par Mayank Agarwal

  Below i have written sample code to download first 7 chunks of mpd file of single quality alongwith base url mp4 of that particular quality.I am putting m4s chunks in queue of strings.How can i play the downloaded data.
  i have queue in which at first iteration is mp4 segment of particular quality
  and then in subsequent iterations i have m4s chunks of same quality
  Now i want to play this queue buffer using ffmpeg or gstreamer.How can i do this
  Individually i am able to play by downloading single mp4(of particular quality in mpd structure) then using cat concatenating with m4s chunks and then play.

  In open source libdash how it is done,if anyone has any idea.

  Please guide.

    #include <iostream>
  
  #include 
  
  #include <curl></curl>curl.h> 
  
  #include <queue>
  
  #include <cstdlib>
  
  
  
  using namespace std;
  
  string data; 
  
  std::queue<string> myqueue;
  
  int size =0;
  
  
  
  
  
  
  
   size_t writeCallback(char* buf, size_t size, size_t nmemb, void* up)
  
   { 
  
  
  
    printf("size  = %d\n\n\n",size);
  
    printf("size nmemb  = %d\n\n\n\n\n",nmemb);
  
    for (int c = 0; c/tell curl how many bytes we handled
  
    }
  
  
  
  
  
  
  
    int main()
  
    {
  
    CURL* curl; //our curl object
  
    char url_firstpart[80];// = NULL;
  
    char bitwide_chunk[10];
  
    char buffer[10];
  
  
  
  
  
  curl_global_init(CURL_GLOBAL_ALL); //pretty obvious
  
  curl = curl_easy_init();
  
  
  
  for(int i=0;i&lt;7;i++)
  
  {   
  
  
  
  strcpy(url_firstpart,"http://www-itec.uni- klu.ac.at/ftp/datasets/mmsys12/Valkaama/valkaama_1s/valkaama_1s_50kbit/valkaama_1s");
  
  string str = to_string(i);
  
  
  
  char * writable = new char[str.size() + 1];
  
  std::copy(str.begin(), str.end(), writable);
  
  writable[str.size()] = '\0'; 
  
  
  
  strcat(writable,".m4s"); 
  
  printf("concanated chink is %s\n",writable);
  
  
  
  strcat(url_firstpart,bitwide_chunk);
  
  puts(url_firstpart);
  
  
  
  
  
  curl_easy_setopt(curl, CURLOPT_URL,url_firstpart);
  
  curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &amp;writeCallback);
  
  curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); 
  
  
  
  curl_easy_perform(curl);
  
  
  
  
  
  
  
  }
  
  
  
  size = myqueue.size();
  
  printf("Final size of queue = %d\n",size);
  
  cout &lt;&lt; endl &lt;&lt; data &lt;&lt; endl;
  
    cin.get();
  
  
  
    curl_easy_cleanup(curl);
  
    curl_global_cleanup();
  
  
  
    return 0;
  
   }
  
  </string></cstdlib></queue></iostream>

• Problem settingup a play command for my discord bot (music) ['Error : FFmpeg/avconv not found !']

  28 août 2023, par TitanFrex

  Im new to programing a discord bot, im more to the web developing enviroment, im trying to create by myself a play command song (only with one link) to try if the first join is working and actually play the song.

  


  (Discord.js v14)

  


  Unfortunately i was having a problem with FFMPEG.
This my actual module for the play.js command, where all the problem is happening.

  


  const { joinVoiceChannel, createAudioPlayer, createAudioResource } = require('@discordjs/voice');
const ytdl = require('ytdl-core');

module.exports = {
    devOnly: true,
    name: 'play',
    description: 'Start to play a song!',
    // options: Object[],

    /**
     *
     * @param {Client} client
     * @param {Interaction} interaction
     */
    callback: async (client, interaction) => {
        const voiceChannel = interaction.member.voice.channel;

        if (!voiceChannel) {
            return interaction.reply('You must be in a voice channel to use this command.');
        }

        const connection = joinVoiceChannel({
            channelId: voiceChannel.id,
            guildId: interaction.guild.id,
            adapterCreator: interaction.guild.voiceAdapterCreator,
        });

        const stream = ytdl('URL_HERE', { filter: 'audioonly' });
        const resource = createAudioResource(stream);

        const player = createAudioPlayer();
        connection.subscribe(player);
        player.play(resource);

        interaction.reply({
            content: `Playing Song`,
            // ephemeral: true,
        });
    }
}


  


  The first error i was receving was 'Error : FFmpeg/avconv not found !', i tried to install it with some guides online. after couple of tries i get it right and the command 'ffmpeg -version' returns.

  


  After that i tought it was workikng, but when i started my project, i receved the same error,. I tried to look up for a solution and i tried to get the process.env.PATH to see but i dont understand if its right or not.

  


  After i removed the console.log(process.env.PATH), i get no errors in the terminal, but it will stil not play the song.

  


• Play MPEG-2 TS using MseStreamSource

  27 novembre 2022, par Nicolas Séveno

  I need to display a live video stream in a UWP application.

  



  The video stream comes from a GoPro. It is transported by UDP messages. It is a MPEG-2 TS stream. I can play it successfully using FFPlay with the following command line :

  



  ffplay -fflags nobuffer -f:v mpegts udp://:8554


  



  I would like to play it with MediaPlayerElement without using a third party library.

  



  According to the following page :
https://learn.microsoft.com/en-us/windows/uwp/audio-video-camera/supported-codecs
UWP should be able to play it. (I installed the "Microsoft DVD" application in the Windows Store).

  



  I receive the MPEG-2 TS stream with a UdpClient. It works well.
I receive in each UdpReceiveResult a 12 bytes header, followed by 4, 5, 6, or 7 MPEGTS packets (each packet is 188 bytes, beginning with 0x47).

  



  I created a MseStreamSource :

  



  _mseStreamSource = new MseStreamSource();
_mseStreamSource.Opened += (_, __) =>
{
    _mseSourceBuffer = _mseStreamSource.AddSourceBuffer("video/mp2t");
    _mseSourceBuffer.Mode = MseAppendMode.Sequence;
};
_mediaPlayerElement.MediaSource = MediaSource.CreateFromMseStreamSource(_mseStreamSource);


  



  This is how I send the messages to the MseStreamSource :

  



      UdpReceiveResult receiveResult = await _udpClient.ReceiveAsync();
    byte[] bytes = receiveResult.Buffer;
    mseSourceBuffer.AppendBuffer(bytes.AsBuffer());


  



  The MediaPlayerElement displays the message "video not supported or incorrect file name". (not sure of the message, my Windows is in French).

  



  Is it a good idea to use the MseAppendMode.Sequence mode ?
What should I pass to the AppendBuffer method ? The raw udp message including the 12 bytes header or each MPEGTS 188 bytes packet ?