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• Compression rate (final size) ffmpeg with h263 as codec, can be improved ?

  29 août 2013, par voskyc

  With the following data :

  Sample 1 :
  vcodec : H263
  Duration : 4seconds
  Resolution:1288/720
  FR : 30fps/s
  datarate : 195.135 kB/s
  MP3 : 44HZ, 16bits

  ---

  Size file : 5.84MB.

  Sample 2 :
  vcodec : H263
  Duration : 4seconds
  Resolution:640/480
  FR : 30fps/s
  datarate : 195.135 kB/s
  MP3 : 44HZ, 16bits

  ---

  Size file = 3.34MB.

  Both in flv container.

  Aren't those sizes a little bit high for 4 second video ?

  I believe we are doing some kind of error or missing an optimization.
  Should we decrease the datarate ?
  Maybe we are missing some option for h263 encoding with FFMPEG ?.

  Thanks a lot in advance for your suggestions.

  Note : no, we "can not" use h264. :-)

• Final results of ffmpeg installation are libraries with missing links

  17 avril 2017, par Mikasa

  [poster@localhost lib]$ ldd libavfilter.so
  
      linux-vdso.so.1 =>  (0x00007ffc6bbd0000)
  
      libswscale.so.4 => not found
  
      libpostproc.so.54 => not found
  
      libavformat.so.57 => not found
  
      libavcodec.so.57 => not found
  
      libswresample.so.2 => not found
  
      libavutil.so.55 => not found
  
      libm.so.6 => /lib64/libm.so.6 (0x00007fc796d79000)
  
      libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fc796b5c000)
  
      libc.so.6 => /lib64/libc.so.6 (0x00007fc79679b000)
  
      /lib64/ld-linux-x86-64.so.2 (0x00007fc79742b000)
  
  [poster@localhost lib]$ ldd libswscale.so
  
      linux-vdso.so.1 =>  (0x00007ffe29572000)
  
      libavutil.so.55 => not found
  
      libm.so.6 => /lib64/libm.so.6 (0x00007f4cfdea3000)
  
      libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f4cfdc87000)
  
      libc.so.6 => /lib64/libc.so.6 (0x00007f4cfd8c6000)
  
      /lib64/ld-linux-x86-64.so.2 (0x00007f4cfe442000)

  All of them are like that.
  I’m a newb and don’t know how to solve this. They’re right next to each other.
  Any suggestion is appreciated. Thank you.

• Matplotlib can not save animation

  1er avril 2020, par Justin Furuness

  I have a matplotlib animation and it will not save. If I do not save it, it runs totally fine and without error. When I try to save it errors with a message that is not helpful. I have googled this error and checked everything, but I cannot seem to find an answer to this problem. I have installed ffmpeg. Am I doing something wrong that is obvious ? I am running on ubuntu 19.10 with matplotlib 3.2.1 if that matters.

  



  The code to save the animation is below :

  



      def run_animation(self, total_rounds):
        anim = animation.FuncAnimation(self.fig, self.animate,
                                       init_func=self.init,
                                       frames=total_rounds * 100,
                                       interval=40,
                                       blit=True)
#        Writer = animation.writers['ffmpeg']
#        writer = Writer(fps=15, metadata=dict(artist='Me'), bitrate=1800)
        anim.save('animation.mp4')


  



  The error traceback :

  



  2020-04-01 02:20:58,279-INFO: MovieWriter._run: running command: ffmpeg -f rawvideo -vcodec rawvideo -s 1200x500 -pix_fmt rgba -r 25.0 -loglevel error -i pipe: -vcodec h264 -pix_fmt yuv420p -y animation.mp4
Traceback (most recent call last):
  File "/home/anon/.local/lib/python3.7/site-packages/matplotlib/backend_bases.py", line 2785, in _wait_cursor_for_draw_cm
    self.set_cursor(cursors.WAIT)
  File "/home/anon/.local/lib/python3.7/site-packages/matplotlib/backends/backend_gtk3.py", line 468, in set_cursor
    self.canvas.get_property("window").set_cursor(cursord[cursor])
AttributeError: 'NoneType' object has no attribute 'set_cursor'


  



  Thanks a million for your help