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• How to save frame numbers with ffmpeg ?

  14 mai 2016, par JulianJ

  I am using ffmpeg to scan video files for scene changes and save the results to a text file. The code I am using below works but I want to simplify the results and just output the frames number where the scene changes occur and the not all the data that this code produces. Any suggestions ?

  ffprobe -show_frames -of compact=p=0 -f lavfi "movie=input.mov,select=gt(scene\,.02)" > results.txt

  Outputs all this :

  media_type=video    stream_index=0  key_frame=1 pkt_pts=31031   pkt_pts_time=1.292958   pkt_dts=31031   pkt_dts_time=1.292958   best_effort_timestamp=31031 best_effort_timestamp_time=1.292958 pkt_duration=N/A    pkt_duration_time=N/A   pkt_pos=82320   pkt_size=629760 width=640   height=328  pix_fmt=rgb24   sample_aspect_ratio=1:1 pict_type=I coded_picture_number=0  display_picture_number=0    interlaced_frame=0  top_field_first=0   repeat_pict=0   tag:lavfi.scene_score=0.025551  

• Matplotlib animation won't save

  17 décembre 2014, par abe678

  I am trying to learn how to create matplotlib animations by using Jake Vanderplas’s basic example, but I’m having trouble getting the figure to save. I installed ffmpeg on my Mac via homebrew.

  The only changes that I have made are to add :

  import matplotlib
  
  matplotlib.use('TKAgg')

  When I run this script I receive the following error :

  anim.save('basic_animation.mp4', fps=30, extra_args=['-vcodec', 'libx264'])
  
  TypeError: save() got an unexpected keyword argument 'extra_args'

  Based on the many other similar questions, I’ve tried setting the ffmpeg path with

  plt.rcParams['animation.ffmpeg_path']

  but that also gives me an error :

  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/matplotlib/__init__.py", line 660, in __setitem__
  
    See rcParams.keys() for a list of valid parameters.' % (key,))
  
  KeyError: 'animation.ffmpeg_path is not a valid rc parameter.See rcParams.keys() for a list of valid parameters.'

  After removing the rcParams setting, I also tried adjusting the save command to avoid the aforementioned TypeError :

  try:
  
      anim.save('basic_animation.mp4', fps=30, extra_args=['-vcodec', 'libx264'])
  
  except TypeError:
  
      anim.save('basic_animation.mp4', fps=30)

  This runs with no error, but the mp4 file is not created. I have read over every thread and tried every solution I can find, but nothing changes. The plt.show() call works just fine. Can anyone please point me in the right direction ? Thanks !

  Update : I’m using matplotlib version 1.1.1

• How to show audio bitrate or volume(in Db) information

  26 février 2014, par poc

  The ffmpeg only shows the video bitrate.How can I show the audio bitrate when I dump a streaming to file

  ffmpeg -i rtsp://172.19.1.40/live.sdp -acodec copy -vcodec copy export.avi