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• Python FFmpeg query rtsp too slow

  6 février 2020, par CDY

  Currently, I am trying to use python with FFmpeg to query rtsp data which the original format is h264.

  The information of the live stream video is, fps:29 ; resolution : 1280*720.

  I wish that I can query the data as the same format "h264" and put into a python queue in order to the future use.

  Here is my code :

  class CCTVReader(threading.Thread):
  
  def __init__(self, queue, URL, fps=29):
  
      super().__init__()
  
      self.queue = queue
  
      self.command = ["ffmpeg",  "-y",
  
                      "-hwaccel",  "nvdec",
  
                      "-c:v",  "h264_cuvid",
  
                      "-vsync", "0",
  
                      "-max_delay", "500000",
  
                      "-reorder_queue_size", "10000",
  
                      "-i",  "rtsp://xxx.xxx.xxx.xxx:xxx/Streaming/Channels/101?transportmode=multicast",
  
                      "-pix_fmt", "yuv420p",
  
                      "-preset", "slow",
  
                      "-an", "-sn",
  
                      "-vf", "fps=29",
  
                      "-"]
  
  def run(self):
  
      pipe = sp.Popen(self.command, stdout = sp.PIPE, bufsize=1024**3, shell=True)
  
      timer = time.time()
  
      counter = 0
  
      while True:
  
          self.queue.put(pipe.stdout.read(int(1280*720*6//4)))

  However, after I run this program about 10 second, my console shows the warning message :

  [rtsp @ 0000020be0fbb9c0] max delay reached. need to consume packet
  
  [rtsp @ 0000020be0fbb9c0] RTP: missed 127 packets

  It seems like my command doesn’t type appropriately.

  Could you kindly give me some suggestion about how to deal with this problem ?

  Thank you very much

• How can I transform a sequence of images into a playable video using LibVLCSharp ?

  9 février 2021, par adamasan

  I have a sequence of images that I was able to extract from a video using LibVLCSharp. This sample to be more specific. I'm creating a small video library manager for learning purposes, and I would like to extract frames and create thumbnails to play when the user hovers the mouse over the previewer.

  


  Using the aforementioned sample I was able to create a WPF UI around the same loging and extract the frames from a video file. However what I want now is to convert these extracted frames into a video file, using them as preview for the video, just like happens on YouTube.

  


  I wasn't able, however, to find out how to achieve this using LibVLCSharp or just LibVLC. Using this answer on Super User I was able to achieve my goal and put those frames together into a video using ffmpeg.

  


  I haven't taken the time yet to study FFmpeg.Autogen, so I don't know if I would be able to extract the frames from the video files in the same way I can do with LibVLCSharp, but I don't see with good eyes using both libraries on my application, one to export the frames and one to generate these frames into a video.

  


  So, is there a way to get the output frames and convert them into a playable video using LibVLCSharp (or libvlc) itself ?

  


• how to locate the voice chat that the discord bot is connected to

  10 mars 2019, par SwaggZ ReYan

  I am making a discord bot that is being activated by voice recognition, im at the very beginning right now im making him join a voice channel (which is working), and im trying to make a command to make him leave.

  const commando = require('discord.js-commando');
  
  
  
  class LeaveChannelCommand extends commando.Command
  
  {
  
      constructor(client){!
  
          super(client,{
  
              name: 'leave',
  
              group: 'music',
  
              memberName: 'leave',
  
              description: 'leaves a voice channel'
  
          });
  
      }
  
      async run(message, args)
  
      {
  
          if(message.guild.voiceConnection)
  
          {
  
              message.guild.voiceConnection.disconnect();
  
          }
  
          else
  
          {
  
              message.channel.sendMessage("seccessfully left")
  
          }
  
      }
  
  }
  
  
  
  module.exports = LeaveChannelCommand;

  right now you can type !leave from anywhere in the server and the bot leaves,
  i want to make it possible to control him only from the same voice channel,
  what should i do