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• Streaming RTP with ffmpeg

  30 mars 2016, par Dmitry

  Im trying to stream audio via rtp over udp with ffmpeg (filename = "rtp://11.89.9.211:30000").
  Here is my code for server(which one is streaming, and I have deleted all checks from code for easy reading) :

      AVStream *stream = NULL;
  
      AVCodec *output_codec = NULL;
  
      int error;
  
      out_ifcx[i] = avformat_alloc_context();
  
      out_ifcx[i]->oformat = av_guess_format("rtp", NULL, NULL);
  
      avformat_alloc_output_context2(&out_ifcx[i], nullptr, "rtp", filename);
  
      avio_open(&(out_ifcx[i])->pb, filename, AVIO_FLAG_WRITE));
  
      av_strlcpy((out_ifcx[i])->filename, filename, sizeof((out_ifcx[i])->filename));
  
      output_codec = avcodec_find_encoder((in_ifcx[i])->streams[0]->codec->codec_id);
  
      stream = avformat_new_stream(out_ifcx[i], output_codec)
  
      out_iccx[i] = stream->codec;
  
      (out_iccx[i])->channels = OUTPUT_CHANNELS;
  
      (out_iccx[i])->channel_layout = av_get_default_channel_layout(OUTPUT_CHANNELS);
  
      (out_iccx[i])->sample_rate = in_iccx[i]->sample_rate;
  
      (out_iccx[i])->sample_fmt = AV_SAMPLE_FMT_S16;
  
      (out_iccx[i])->bit_rate = iccx[i]->bit_rate;
  
      if ((out_ifcx[i])->oformat->flags & AVFMT_GLOBALHEADER)
  
          (out_iccx[i])->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
      avcodec_open2(out_iccx[i], output_codec, NULL)

  PS : out_iccx[i], in_iccx[i] - vector; out_ifcx[i] in_ifcx[i] - vector
  Problem with it is : when i`m trying to reach another computer in the same network this code gives an error

  udp_resolve_host: nodename nor servname provided, or not known

  Also, when i`m streaming to the same computer but on other port (I use not local host IP(127.0.0.1), but of this computer : 11.88.8.20), everything works perfect.
  I dont know why and how to fix it. Can anyone help, please ?

• How to get playing audio file data in ffmpeg stream ?

  27 juin 2022, par Viktor Kushnir

  Dears experts of the wonderful ffmpeg utility ! Tell me please who knows this :
I want to make a 24/7 stream on YouTube of music from looped video and audio tracks.
I do it like this :

  


  ffmpeg -loglevel info -stream_loop -1 -y -re \
    -i video.mp4 \
    -f concat -safe 0 -i playlist.txt \
    -c:v libx264 -preset veryfast -b:v 3000k -maxrate 3000k -bufsize 6000k \
    -framerate 25 -video_size 1280x720 -vf "format=yuv420p" -g 50 -shortest -strict experimental \
    -c:a aac -b:a 128k -ar 44100 \
    -f flv rtmp://localhost/live/my-stream


  


  i.e. video.mp4 is spinning in a loop and from the playlist.txt file I play mp3 in turn.
With this everything is ok, everything works. But I also want to show the title of the playing track.
As for example on some YouTube radios :



  


  With cover is perfect !

  


  Any ideas how this can be implemented ?

  


  I know that it is possible to display text through drawtext. You can output text from a file, which you can separately update yourself. But how to get the data of the currently playing file ? ffmpeg does not give such information, only stream parameters : fps, framerate... Or is it still possible to get it ?

  


  Or are there better and easier ways ?

  


  Thanks in advance for your help !

  


• Screen recorder in Ubuntu using python

  3 août 2013, par mridul

  I am a hobby programmer and trying to make screen-recorder in Ubuntu using python.
  Using this code able to take screenshot.

  import wx
  
  app = wx.App(False)
  
  s = wx.ScreenDC()
  
  w, h = s.Size.Get()
  
  b = wx.EmptyBitmap(w, h)
  
  m = wx.MemoryDCFromDC(s)
  
  m.SelectObject(b)
  
  m.Blit(0, 0, w, h, s, 0, 0)
  
  m.SelectObject(wx.NullBitmap)
  
  b.SaveFile("screenshot.png", wx.BITMAP_TYPE_PNG)

  And using loop I take more pictures and create video using these screen shots.My code is given bellow,

  import wx,os
  
  app=wx.App(False)
  
  s = wx.ScreenDC()
  
  w, h = s.Size.Get()
  
  b = wx.EmptyBitmap(w, h)
  
  m = wx.MemoryDCFromDC(s)
  
  i=0
  
  while i<50:
  
     m.SelectObject(b)
  
     m.Blit(0, 0, w, h, s, 0, 0)
  
     m.SelectObject(wx.NullBitmap)
  
     b.SaveFile('{0:05d}.png'.format(i), wx.BITMAP_TYPE_PNG)
  
     i+=1
  
  os.system('ffmpeg -f image2 -r 8 -i %05d.png -vcodec mpeg4 -y movie1.mp4')
  
  i=0  
  
  while i<50:
  
     os.remove('{0:05d}.png'.format(i))
  
     i += 1   `

  In above code I take 50 pictures and store as 00000.png to 00049.png and make video using ffmpeg.
  After creating video I delete all pictures.

  Current Problems :

  • Very small delay between screen shoots. If try to record videos using this code out put is not perfect.
  • For recording long time it is not efficient. It take lot of hard drive memory to store screen shoots. And use more CPU .

  What I do for get code more efficient ? Using pure python how to create video from pictures ? Is there any alternative methods to record screen ?
  I like to improve my code.