Recherche avancée

Sur d’autres sites (7397)

• How to deal ffplay being too slow playing iPhone's videos ?

  8 janvier 2020, par Mikhail T.

  Trying to play a 3840x2160 video recorded by an iPhone 7 (@30fps), I get frequent pauses — in the video, music keeps playing.

  This happens both in firefox and when ffplay is invoked to play the file directly — from command-line. The CPU is a dual E6700 @3.20GHz — not super fast, but it should be able to play smoothly, shouldn’t it ? Video is Intel’s "series 4" integrated chipset — again, not a speed-daemon, but it should be adequate... Support for Intel’s VA API is included.

  I build ffmpeg-4.1 from source using FreeBSD port. As you can see, the port has a maddening amount of options — including several different ones for the 264-codec.

  Any suggestions for improving the decoding speed to the point, where it is watchable by a human ? Thank you !

• How to deal ffplay being too slow playing iPhone's videos ?

  8 janvier 2020, par Mikhail T.

  Trying to play a 3840x2160 video recorded by an iPhone 7 (@30fps), I get frequent pauses — in the video, music keeps playing.

  



  This happens both in firefox and when ffplay is invoked to play the file directly — from command-line. The CPU is a dual E6700 @3.20GHz — not super fast, but it should be able to play smoothly, shouldn't it ? Video is Intel's "series 4" integrated chipset — again, not a speed-daemon, but it should be adequate... Support for Intel's VA API is included.

  



  I build ffmpeg-4.1 from source using FreeBSD port. As you can see, the port has a maddening amount of options — including several different ones for the 264-codec.

  



  Any suggestions for improving the decoding speed to the point, where it is watchable by a human ? Thank you !

  


• MovieWriter FFwriter unavailable. Trying to use pillow instead

  17 février 2020, par Life is Good

  I have created a bar chart race in Matplotlib and now I am trying to save it into a gif file. I have imported the relevant library :

  import matplotlib.animation as animation
  
  plt.rcParams['animation.ffmpeg_path'] = '‪C:\\Program Files\\FFmpeg\\bin\\ffmpeg.exe'
  
  FFwriter = animation.FFMpegWriter()

  Here is the code I used to create my animation :

  fig, ax = plt.subplots(figsize=(15, 8))
  
  animator = animation.FuncAnimation(fig, draw_barchart, frames=range(1999, 2015))
  
  HTML(animator.to_jshtml()) 

  However, when I searched for the writers, there are only two of them :

  animation.writers.list()

  

  I had already installed FFmpeg following a tutorial on Wikihow, and I am also able to run FFmpeg from the command line, so I don’t understand why it is not showing up. When I try to save my animation into a gif, I get this error message :
  

  Would anybody be familiar with this error message, please ? Thank you very much.