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• Receive rtp (opus) stream from ffmpeg on other computer with VLC

  27 juin 2015, par Friendlyghost89

  I am currently trying to get an opus stream to play on a separate computer using VLC.

  Currently the setup is as follows :

  Odroid-U2 running ffmpeg to capture audio and send as rtp opus stream to remote computer....
  command used : ffmpeg -f alsa -ac 1 -i hw:0 -acodec libopus -ab 32k -ac 1 -f rtp rtp ://192.168.0.115:2032

  the remote computer (on same local network) is at 192.168.0.115
  the Odroid is at 192.168.0.124

  If i use libmp3lame in libopus’s place then the stream will run through without a problem and will not prompt the fact that it requires sdp....

  VLC output on remote computer :

  SDP required: A description in SDP format is required to receive the RTP stream. Note that rtp:// URIs cannot work with dynamic RTP payload format (97).

  If i use an *.sdp file that I drop into vlc to play the stream it does nothing (no errors and no playback)

  SDP file used :

      SDP:
  
      v=0
  
      o=- 0 0 IN IP4 127.0.0.1
  
      s=No Name
  
      c=IN IP4 192.168.0.115
  
      t=0 0
  
      a=tool:libavformat 55.2.100
  
      m=audio 2032 RTP/AVP 97
  
      b=AS:32
  
      a=rtpmap:97 opus/48000

  ffmpeg output on Odroid :

      linaro@linaro-ubuntu-desktop:~$ ffmpeg -f alsa -ac 1 -i hw:0 -acodec libopus -ab 32k -ac 1         -f rtp rtp://192.168.0.115:2032
  
      ffmpeg version git-2013-04-13-87dd62e Copyright (c) 2000-2013 the FFmpeg developers
  
        built on Apr 13 2013 09:47:34 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
        configuration: --enable-gpl --enable-libmp3lame --enable-libopencore-amrnb --enable-        libopencore-amrwb --enable-libspeex --enable-librtmp --enable-libtheora --enable-libvorbis         --enable-libvpx --enable-x11grab --enable-libx264 --enable-nonfree --enable-version3         --enable-libopus
  
        libavutil      52. 26.100 / 52. 26.100
  
        libavcodec     55.  2.100 / 55.  2.100
  
        libavformat    55.  2.100 / 55.  2.100
  
        libavdevice    55.  0.100 / 55.  0.100
  
        libavfilter     3. 53.101 /  3. 53.101
  
        libswscale      2.  2.100 /  2.  2.100
  
        libswresample   0. 17.102 /  0. 17.102
  
        libpostproc    52.  3.100 / 52.  3.100
  
      Guessed Channel Layout for  Input Stream #0.0 : mono
  
      Input #0, alsa, from 'hw:0':
  
        Duration: N/A, start: 1365868129.196234, bitrate: 768 kb/s
  
          Stream #0:0: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
  
      Output #0, rtp, to 'rtp://192.168.0.115:2032':
  
        Metadata:
  
          encoder         : Lavf55.2.100
  
          Stream #0:0: Audio: opus, 48000 Hz, mono, s16, 32 kb/s
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (pcm_s16le -> libopus)
  
      SDP:
  
      v=0
  
      o=- 0 0 IN IP4 127.0.0.1
  
      s=No Name
  
      c=IN IP4 192.168.0.115
  
      t=0 0
  
      a=tool:libavformat 55.2.100
  
      m=audio 2032 RTP/AVP 97
  
      b=AS:32
  
      a=rtpmap:97 opus/48000

  Any help is greatly appreciated....

  Regards

• Saving scatterplot animations with matplotlib produces blank video file

  1er avril 2013, par user2175850

  I am having a very similar problem to this question

  but the suggested solution doesn't work for me.

  I have set up an animated scatter plot using the matplotlib animation module. This works fine when it is displaying live. I would like to save it to an avi file or something similar. The code I have written to do this does not error out but the video it produces just shows a blank set of axes or a black screen. I've done several checks and the data is being run and figure updated it's just not getting saved to video...

  I tried removing "animated=True" and "blit=True" as suggested in this question but that did not fix the problem.

  I have placed the relevant code below but can provide more if necessary. Could anyone suggest what I should do to get this working ?

  def initAnimation(self):
  
          rs, cfgs = next(self.jumpingDataStreamIterator)     
  
          #self.scat = self.axAnimation.scatter(rs[0], rs[1], c=cfgs[0], marker='o')
  
          self.scat = self.axAnimation.scatter(rs[0], rs[1], c=cfgs[0], marker='o', animated=True)
  
          return self.scat,
  
  
  
  
  
  def updateAnimation(self, i):
  
      """Update the scatter plot."""
  
      rs, cfgs = next(self.jumpingDataStreamIterator)
  
      # Set x and y data...
  
      self.scat.set_offsets(rs[:2,].transpose()) 
  
      #self.scat = self.axAnimation.scatter(rs[0], rs[1], c=cfgs[0], animated=True)
  
      # Set sizes...
  
      #self.scat._sizes = 300 * abs(data[2])**1.5 + 100
  
      # Set colors..
  
      #self.scat.set_array(cfgs[0])
  
      # We need to return the updated artist for FuncAnimation to draw..
  
      # Note that it expects a sequence of artists, thus the trailing comma.
  
      matplotlib.pyplot.draw()
  
      return self.scat,
  
  
  
  def animate2d(self, steps=None, showEvery=50, size = 25):
  
      self.figAnimation, self.axAnimation = matplotlib.pyplot.subplots()
  
      self.axAnimation.set_aspect("equal")
  
      self.axAnimation.axis([-size, size, -size, size])
  
      self.jumpingDataStreamIterator = self.jumpingDataStream(showEvery)
  
  
  
      self.univeseAnimation = matplotlib.animation.FuncAnimation(self.figAnimation, 
  
                              self.updateAnimation, init_func=self.initAnimation,
  
                              blit=True)
  
      matplotlib.pyplot.show()
  
  
  
  def animate2dVideo(self,fileName=None, steps=10000, showEvery=50, size=25):
  
      self.figAnimation, self.axAnimation = matplotlib.pyplot.subplots()
  
      self.axAnimation.set_aspect("equal")
  
      self.axAnimation.axis([-size, size, -size, size])
  
      self.Writer = matplotlib.animation.writers['ffmpeg']
  
      self.writer = self.Writer(fps=1, metadata=dict(artist='Universe Simulation'))
  
      self.jumpingDataStreamIterator = self.jumpingDataStream(showEvery)
  
  
  
      self.universeAnimation = matplotlib.animation.FuncAnimation(self.figAnimation, 
  
                              self.updateAnimation, scipy.arange(1, 25), init_func=self.initAnimation)
  
  
  
      self.universeAnimation.save('C:/universeAnimation.mp4', writer = self.writer)

• ffmpeg merge video and audio result empty file [on hold]

  10 février 2015, par ahmed-ibrahem

  I have empty file when try to merge mp4 & mp3 to mp4

  Code : ( not working )

  ffmpeg -i video.mp4 -i audio.mp3 output.mp4

  Code : ( working )

  ffmpeg -i video.mp4 -i audio.mp3 -vcodec copy -acodec copy output.mp4

  but using above working command instead of mp3 when i try wav result empty file only

  Note : This is where i got the <a href="https://github.com/JayH5/android-ffmpeg-cmdline" rel="nofollow">ffmpeg for android</a>

  Can any one help me to make it merge the audio.wav with the video.mp4 ?