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• Extract images from ffmpeg stream

  30 juillet 2022, par Exitare

  I am trying to setup an application which receives a stream via tcp from a localhost webcam. The stream is generated by ffmpeg like so :

  


  ffmpeg -f avfoundation -framerate 30 -i 0 -target pal-dvd -probesize 42M -pix_fmt uyvy422 -f mpegts -flush_packets 0 tcp://127.0.0.1:9050


  


  My receiving server application code looks like this :

  


  public static void StartServer()
{
   
    bool done = false;

    var listener = new TcpListener(IPAddress.Any, 9050);

    listener.Start();
    
    // Buffer for reading data
    var bytes = new byte[256];
    string data;
    
    while (!done)
    {
        Console.WriteLine("Waiting for connection...");
        TcpClient client = listener.AcceptTcpClient();

        
        data = null;

        // Get a stream object for reading and writing
        NetworkStream stream = client.GetStream();

        int i;
        Console.WriteLine("Connection accepted.");
        // Loop to receive all the data sent by the client.
        while((i = stream.Read(bytes, 0, bytes.Length))!=0)
        {
            // Translate data bytes to a ASCII string.
            Console.WriteLine("Received: {0}", bytes);

            
        }
       
    }

    listener.Stop();
}


  


  ffmpeg is able to connect and send the stream, the c# application is able to receive the stream.

  


  The output by the Console.WriteLine call is like so :

  


  Received: System.Byte[]
Received: System.Byte[]
Received: System.Byte[]
Received: System.Byte[]
Received: System.Byte[]
Received: System.Byte[]
Received: System.Byte[]
Received: System.Byte[]
Received: System.Byte[]
Received: System.Byte[]
Received: System.Byte[]


  


  However, I am unsure how to create images from these bytes. In theory I would have to wait until I receive the whole image, as I expect the image to be greater than 256bytes.

  


  In short, I receive the bytes but don't know how to convert them into images.
How do I do this ?

  


  Also I am not sure if this is the best approach. I know that ffmpeg offers the possibility to extract images from videos. But I don't know, whether this is also possible using streams. Is there a solution provided by ffmpeg to extract images from an input stream ? Ideally 10 images per second.

  


• FFMPEG and HTTPS

  14 juin 2012, par Joel

  ffmpeg lists http as a protocol when I ask : ffmpeg -protocols

  Does this also mean support for a https url ? Do I need to encode this url somehow for the command line. I get "No such file or directory", but with http urls (at least some) it does work.

  A url (created for a Amazon S3 bucket) similar to this one does not seem to work :
  https://mycompany-video-test.s3.amazonaws.com/client/btr/video/xyz0011-x403-snap-n-go-ex/1/video/baby-laugh-ripping-paper.mp4?AWSAccessKeyId=AVIAZL9J6SIRPAA&Expires=1323709667&Signature=pTvS9F2do2t8%3D

  I suspect the format of the url is problematic, I've also tried enclosing in quotes... Yes, this URL does not currently work as it has expired, but even while its valid, its a problem.

  In short :
  1) Should https work ?
  2) Do I need to format the url somehow ?

• heroku-22 stack discord.py bot doesn't play music

  30 août 2022, par bon ho

  I'm making music bot with discord.py and using heroku. bot is playing music my localhost but heroku host is not playing music.

  


  I found what cause a bug.
It working nicely in heroku-20, but not working in heroku-22 stack.

  


  How can I use heroku-22 stack without error ?
What can I do ?

  


  I'm sorry my english is bad.

  


  my code :

  


  import youtube_dl
import discord
from discord import app_commands,Interaction
import asyncio
import os

class MyClient(discord.Client):
  async def on_ready(self):
    await self.wait_until_ready()
    await tree.sync()
    print(f"login at {self.user}")
        
intents= discord.Intents.all()
client = MyClient(intents=intents)
tree = app_commands.CommandTree(client)

youtube_dl.utils.bug_reports_message = lambda: ''
ytdl_format_options = {
    'format': 'bestaudio/best',
    'outtmpl': '%(extractor)s-%(id)s-%(title)s.%(ext)s',
    'restrictfilenames': True,
    'noplaylist': True,
    'nocheckcertificate': True,
    'ignoreerrors': False,
    'logtostderr': False,
    'quiet': True,
    'no_warnings': True,
    'default_search': 'auto',
    'source_address': '0.0.0.0',  # bind to ipv4 since ipv6 addresses cause issues sometimes
}

ffmpeg_options = {
    'options': '-vn',
}
ytdl = youtube_dl.YoutubeDL(ytdl_format_options)
class YTDLSource(discord.PCMVolumeTransformer):
    def __init__(self, source, *, data, volume=0.5):
        super().__init__(source, volume)

        self.data = data

        self.title = data.get('title')
        self.url = data.get('url')

    @classmethod
    async def from_url(cls, url, *, loop=None, stream=True):
        loop = loop or asyncio.get_event_loop()
        data = await loop.run_in_executor(None, lambda: ytdl.extract_info(url, download=not stream))
        if 'entries' in data:
            # take first item from a playlist
            data=data['entries'][0]
        filename = data['url'] if stream else ytdl.prepare_filename(data)
        return cls(discord.FFmpegPCMAudio(filename, **ffmpeg_options), data=data)
queue={}
@tree.command(name="play", description="play music")
async def playmusic(interaction:Interaction,url_title:str,playfirst:bool=False):
  await interaction.response.send_message("I'm looking for music!!")
  guild=str(interaction.guild.id)
  try:
    queue[guild]
  except KeyError:
    queue[guild]=[]
  if interaction.user.voice is None:
    await interaction.edit_original_response(content="you must join any voice channel")
  else:
    voice_client: discord.VoiceClient = discord.utils.get(client.voice_clients, guild=interaction.guild)
    if voice_client == None:
      await interaction.user.voice.channel.connect()
      voice_client: discord.VoiceClient = discord.utils.get(client.voice_clients, guild=interaction.guild)
    player = await YTDLSource.from_url(url_title, loop=None)
    if playfirst and len(queue[guild])>1:
      queue[guild].insert(1,player)
    else:
      queue[guild].append(player)
    if not voice_client.is_playing():
      voice_client.play(player,after=None)
      await interaction.edit_original_response(content=f"{player.title} playing!!")
    else:
      await interaction.edit_original_response(content=f"{player.title} enqueued!")
    await asyncio.sleep(7)
    await interaction.delete_original_response()

client.run(token)