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• How to use ffmpeg to play ps stream ?

  10 février 2018, par Zhang

  I use ffmpeg api to play media based on rtsp，but print log "Could not find codec parameters for stream 0 (Video : none, none) : unknown codec" . rtp payload is ps packet，how can I demux？

  if (avformat_open_input(&avFormatCtx, pathUrl, NULL, NULL) != 0) {
  
      NSLog(@"Open video file fail!!!");
  
      return NO;
  
  }
  
  
  
  // Retrieve stream information
  
  if (avformat_find_stream_info(avFormatCtx, NULL) < 0) {
  
      NSLog(@"Retrieve stream information fail!!!");
  
      return NO;
  
  }
  
  
  
  // Find the first video stream
  
  videoStream =  av_find_best_stream(avFormatCtx, AVMEDIA_TYPE_VIDEO, -1, -1, &avCodec, 0);
  
  char *errstr =   av_err2str(videoStream);

• 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.