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• Can only save animation in matplotlib with default parameters

  20 août 2019, par J.Doe

  I keep getting this error when trying to save my animations in matplotlib :

  import numpy as np
  
  import matplotlib.pyplot as plt
  
  from matplotlib.animation import FuncAnimation
  
  
  
  plt.rcParams['animation.ffmpeg_path'] = 'C:\FFmpeg\bin'
  
  
  
  fig, ax = plt.subplots()
  
  ax.set_xlim(-0.1 ,2*np.pi + 0.1)
  
  ax.set_ylim(-1.1 ,1.1)
  
  ln, = plt.plot([], [], '-')
  
  
  
  x = np.linspace(0,2*np.pi,1000)
  
  
  
  def update(frame):
  
  
  
      y = frame*np.sin(x)
  
      ln.set_data(x,y)
  
      return ln,
  
  
  
  ani = FuncAnimation(fig,
  
                      update,
  
                      frames=np.linspace(1,-1,1000),
  
                      interval=1000/144)
  
  
  
  ani.save('lol.gif')

  MovieWriter ffmpeg unavailable. Trying to use pillow instead.

  This is a repetition of an unanswered question : UserWarning : MovieWriter ffmpeg unavailable

  I tried running a sample code from here, but it still says ffmpeg isn’t available, even though I installed and activated it according to wikihow. So even setting the path to the binary doesn’t seem to work.

  I can’t set the fps or the dpi, or anything since the save function just defaults. What can I do so that python finally starts using ffmpeg ?

• ReSample RTP Audio data over Socket as PCM data using FFMPEG

  5 février 2020, par GJ.

  I want to receive a RTP Stream and send the raw data received in it over TCP / UDP socket. For this i am trying following commands.

  1. I am sending the RTP stream using following command.

     ffmpeg -re -i hello.wav -ar 8000 -f mulaw -f rtp rtp ://127.0.0.1:1234

  2. Receiver to re transmit the stream over TCP / UDP socket.

     ffmpeg -i rtp ://127.0.0.1:1234 -f mulaw tcp ://127.0.0.1:5555 -hide_banner

  3. A Player to play this Socket stream to verify.

     ffplay tcp ://127.0.0.1:5555 ?listen

  My second command shows that its receiving data and transmitting the data to tcp over 5555 port.

  Input #0, rtp, from 'rtp://127.0.0.1:1234':
  
    Duration: N/A, start: 0.000000, bitrate: 64 kb/s
  
      Stream #0:0: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_mulaw (native) -> pcm_mulaw (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, mulaw, to 'tcp://127.0.0.1:5555':
  
    Metadata:
  
      encoder         : Lavf58.29.100
  
      Stream #0:0: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
  
      Metadata:
  
        encoder         : Lavc58.54.100 pcm_mulaw

  But the third command does not receive anything, even i tried dumping the response into a file using FFMPEG in command three but same results.

  What am i doing wrong, Please suggest the correct commands using FFMPEG.

• FFmpeg and bash, Transcode multiple files to another drive with save path

  18 juillet 2016, par Виктор Гусев

  I have folder that contain files in many different path, for example : folder1/subfolder1/file.mov
  folder1/subfolder2/file.mov

  i need to convert and copy all files to another format, and save all paths after folder 1, for example :
  folder2/subfolder1/file.mp4
  folder2/subfolder2/file.mp4

  I have this script, but it save transcoded files in original location.

  #!/bin/bash
  
  MOVIES=/Volumes/drive/
  
  find "$MOVIES" -name '*.MP4' -exec sh -c 'ffmpeg -i "$0" -map 0 -c copy "${0%%.MP4}.mov"' {} \; exit;

  Please help
  Thank you !