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• How can I recieve an RTP stream with JavaCV ?

  11 janvier 2019, par c.berger

  I’m trying to stream video from an RTP server (currently VLC for testing) and decode it in Java. To do this, I’m using JavaCV to decode the incoming stream. Here’s what I have so far :

  try {
  
      grabber = new FFmpegFrameGrabber("rtp://localhost:5004/test");
  
      grabber.setFormat("h264");
  
      grabber.setFrameRate(30.0);
  
      grabber.start();
  
      Java2DFrameConverter converter = new Java2DFrameConverter();
  
      while (true) {
  
          Frame frame = grabber.grab();
  
          imageToDraw = frame != null ? converter.convert(frame) : null;
  
          // goes off to paint a widget on a window, see https://git.io/fhZSr for more context
  
          repaint();
  
      }
  
  } catch (Exception e) {
  
      // TODO: Discover what circumstances cause this
  
      e.printStackTrace(System.out);
  
  }

  On VLC, my stream settings are set like this :

  • Destination stream : RTP/TS (address localhost, port 5004, and stream name test.)
  • Transcoding active, set to "Video - H.264 + MP3 (TS)" preset :
    • MPEG-TS encapsulation
    • h.264 video with MPEG audio
  • Stream all elementary streams is off.

  I can get one VLC instance to stream to another with these settings (with the "client" VLC receiving from rtp://localhost:5004/test), and it works just fine. (The only issues arise from having a weak test machine not suited transcoding high res video.)

  Switch over to Java, and all I can see is gray frames with a spat of color here and there. The console is also screaming the whole way through. Some snippets (the full log is too long to be a reasonable post, but it can be found here if you really want it) :

  [h264 @ 0x7f6c4c3502c0] cabac decode of qscale diff failed at 8 12
  
  [h264 @ 0x7f6c4c3502c0] error while decoding MB 8 12, bytestream 670
  
  [h264 @ 0x7f6c4c3502c0] concealing 421 DC, 421 AC, 421 MV errors in P frame

  ---

  [h264 @ 0x7f6c4c3502c0] Reference 4 >= 2
  
  [h264 @ 0x7f6c4c3502c0] error while decoding MB 25 8, bytestream 416
  
  [h264 @ 0x7f6c4c3502c0] concealing 556 DC, 556 AC, 556 MV errors in B frame

  ---

  [h264 @ 0x7f6c4c3502c0] Reference 5 >= 4
  
  [h264 @ 0x7f6c4c3502c0] error while decoding MB 21 1, bytestream 6042
  
  [h264 @ 0x7f6c4c3502c0] concealing 826 DC, 826 AC, 826 MV errors in P frame
  
  [h264 @ 0x7f6c4c3502c0] Invalid NAL unit 8, skipping.
  
  [above line repeats 5x]
  
  [h264 @ 0x7f6c4c3502c0] top block unavailable for requested intra mode
  
  [h264 @ 0x7f6c4c3502c0] error while decoding MB 3 0, bytestream 730
  
  [h264 @ 0x7f6c4c3502c0] concealing 836 DC, 836 AC, 836 MV errors in P frame

  Is there something I am clearly doing wrong ?

• Anomalie #4361 (Nouveau) : Message d’erreurs divers sur PHP 7.2.19 sur nouvelle installation ou PH...

  13 juillet 2019, par Vincent ROBERT

  Sur Xampp avec Apache 2.4.39 (Win64) & PHP 7.2.19 - Chrome
  Sur une installation fraiche, sans aucun plugin activé autre que ceux pas défaut :

  Sur la page : http://localhost/news-test/ecrire/?exec=admin_plugin

  Warning : count() : Parameter must be an array or an object that implements Countable in C :\xampp\htdocs\news-test\plugins-dist\svp\inc\svp_actionner.php on line 704
  Warning : count() : Parameter must be an array or an object that implements Countable in C :\xampp\htdocs\news-test\plugins-dist\svp\inc\svp_actionner.php on line 713
  Warning : count() : Parameter must be an array or an object that implements Countable in C :\xampp\htdocs\news-test\plugins-dist\svp\inc\svp_actionner.php on line 753

  http://localhost/news-test/ecrire/?exec=configurer_contenu

  Warning : count() : Parameter must be an array or an object that implements Countable in C :\xampp\htdocs\news-test\ecrire\public\iterateur.php on line 284

  http://localhost/news-test/ecrire/?exec=configurer_forum

  Warning : count() : Parameter must be an array or an object that implements Countable in C :\xampp\htdocs\news-test\ecrire\public\iterateur.php on line 284

  *Sur une installation moins fraiche sur PHP Version 7.2.20 en ligne

  /ecrire/ ?exec=configurer_forum

  Warning : count() : Parameter must be an array or an object that implements Countable in /htdocs/ecrire/public/iterateur.php on line 284

• Hosting music bot on heroku

  2 mars 2021, par itsmaxplayz

  I have made a discord bot on discord.py rewrite which plays music in a voice channel. The code is as follows :

  


  def search(query):

    with ytdl:
        try:
            requests.get(query)
        except:
            info = ytdl.extract_info(f"ytsearch:{query}", download=False)['entries'][0]
        else:
            info = ytdl.extract_info(query, download=False)
    return info, info['formats'][0]['url']

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

}

ytdl = youtube_dl.YoutubeDL(ydl_opts)

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

@client.command(aliases=['p'])
async def play(ctx, *, url):
    channel = ctx.message.author.voice.channel
    voice = get(client.voice_clients, guild=ctx.guild)
    if voice and voice.is_connected():
        pass
    else:
        voice = await channel.connect()
        await ctx.send(f'Successfully joined `{channel}`')

    if voice.is_playing():
        await ctx.send('Already playing a song. Try using -q or -queue to queue a song 
    :thumbsup:')
    else:
        await ctx.send(f'Searching for: `{url}` :mag_right:')
        video, source = search(url)
        voice.play(FFmpegPCMAudio(source, **FFMPEG_OPTS))
        voice.is_playing()
        await ctx.send(f'Playing: :notes: `{video["title"]}` - Now!')


  


  It works locally but when I upload the code to heroku (I use github to push the code to heroku), the bot does not come online.
These are the libraries that I imported in the code :

  


  import discord
import json
import random
import youtube_dl
import requests
import os
from discord.ext import commands
from discord.utils import get
from discord import FFmpegPCMAudio
import ctypes
import ctypes.util


  


  I have installed the ffmpeg buildpacks as I saw in another post on this website but the bot doesn't come online.

  


  Contents of my requirement file :

  


  discord.py,
discord.py[voice],
ffmpeg,
PyNaCl,
youtube_dl,
requests,
discord.py[FFmpegPCMAudio],
colorlog.