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• Convert video into individual frames using Python without ffmpeg ?

  20 février 2015, par Mridula Madhusudan

  I need to compare 2 videos to check whether they are the same.

  So I am planning to do the following :

  1. Split both the videos into individual frames
  2. Compare each frame with the corresponding frame of the ref video using Python Image Lib
  3. Count the number of different frames to decide whether they are same.

  I would like to know whether there is any function in Python to help me with the first step, i.e., to split the video into individual frames. I do not want to use ffmpeg to do the splitting.

  Thanks in advance for the help

• Python Matplotlib Basemap animation with FFMpegwriter stops after 820 Frames ?

  5 août 2013, par cpaulik

  If I run the following code it just stops after 820 Frames. I tested this on both a Ubuntu 12.04 VM and on Linux Mint 15. Unfortunately there is no error message. The program just hangs after printing 2012-06-02T16:54:00

  import os, sys
  
  import matplotlib.pyplot as plt
  
  from mpl_toolkits.basemap import Basemap
  
  import matplotlib.animation as animation
  
  from datetime import datetime,timedelta
  
  
  
  def animation_test(start,end,fps=10,save_path='/home/username/animation_test/',\
  
  save_name="test.mp4",dpi=80):
  
  
  
      step = timedelta(minutes = 3)
  
  
  
      current = start
  
  
  
      dates =[]
  
  
  
      frame = 0
  
  
  
      while current <=end:
  
          dates.append(current)
  
          current += step
  
  
  
      fig = plt.figure(figsize=(16,9),facecolor='k',edgecolor='k')
  
      ax = fig.add_subplot(111)
  
  
  
      metadata = dict(title='Movie Test', artist='Matplotlib',
  
              comment='Movie support!')
  
      writer = animation.FFMpegWriter(fps=fps, metadata=metadata,bitrate=20000)
  
  
  
      direction = -0.5
  
      lat_current = 0
  
      lon_current = 0
  
  
  
      with writer.saving(fig,os.path.join(save_path,save_name),dpi):
  
  
  
          for current in dates:
  
  
  
              ax.cla()
  
              if direction > 0 and lat_current > 40 or \
  
                     direction < 0 and lat_current < -40:
  
                      direction = - direction
  
  
  
              lat_current = lat_current + direction
  
              lon_current = lon_current - 0.75
  
              if lon_current < -180 :
  
                  lon_current += 360
  
              basem = Basemap(projection='ortho', lat_0=lat_current, lon_0=lon_current, resolution='l',ax=ax)
  
              basem.drawcoastlines()
  
  
  
              #plt.show()
  
  
  
              plt.savefig(os.path.join(save_path, 'frame%d.png'%frame),
  
                  dpi=dpi,facecolor='w',edgecolor='k')
  
  
  
              writer.grab_frame()
  
              frame += 1
  
              print current.isoformat()
  
  
  
  start = datetime.now()
  
  animation_test(datetime(2012,6,1,0,0,0),datetime(2012,6,4,0,0,0),fps=10,dpi=80)
  
  print datetime.now() - start

  To explain the code a little bit :
  I want to make an animation of satellite data which comes in small 3 minute files and show it on a rotating globe. This is why I chose to make the loop in the following example code step through the animation in 3 minute steps. I just removed the reading and plotting of the satellite data in order to make the code executable by anyone.

  When I removed basemap from the program and just plotted a scatterplot of random data the program ran all the way through.

  I'm not sure but I don't think that it is a memory issue since my RAM is only utilized approx. 20% while the program is running.

  Thanks for any help in getting to the bottom of this.

• python ff-mpeg not working on VM

  2 août 2013, par Bob

  I have two Windows 2008 R2 64 bit servers with two different host providers (GoDaddy and company B). My python script runs successfully on GoDaddy's server. It doesn't run successfully on the server with company B.

  I installed the same software on both servers :

  • Python 2.7 for Windows 32 bit
  • NumPY module
  • SetupTools
  • EchoNest API for Windows

  The company B server is giving me an error related to an executable called en-ffmpeg.exe that uses the python ff-mpeg module. The exact error message is

  [dv @ 0x1449690]Can't determine profile of DV input stream.
  C :\Music\song1.mp3 : Error while opening file

  The song.mp3 file exists. I installed the latest Windows updates on the server with Company B but still I get the error. I believe the error is because something is not configured properly on this server (missing libraries or drivers ?). However, I don't know what that is !

  Please help :)

  UPDATED TO INCLUDE COMMAND AND ERROR OUTPUT FROM FFMPEG

  COMMAND :

  c :\Python27>en-ffmpeg -i "C :\Music\song1.mp3" -y -ac 2 -ar 44100
  "c :\users\x07 dmini 1\x07ppdata\local\temp\x02\tmpax82jf.wav"

  FULL ERROR :

  FFmpeg version SVN-r17988-Komeil, Copyright (c) 2000-2009 Fabrice Bellard, et al
  
  .
  
    configuration: --enable-memalign-hack --extra-cflags=-fno-common --enable-stat
  
  ic --disable-shared --disable-debug --enable-gpl --enable-nonfree --enable-avfil
  
  ter --enable-avfilter-lavf --enable-avisynth --enable-postproc --enable-pthreads
  
   --enable-libamr-nb --enable-libamr-wb --enable-libgsm --enable-libfaac --enable
  
  -libfaad --enable-libmp3lame --enable-libschroedinger --enable-libspeex --enable
  
  -libtheora --enable-libvorbis --enable-libx264 --enable-libxvid
  
    libavutil     50. 0. 0 / 50. 0. 0
  
    libavcodec    52.21. 0 / 52.21. 0
  
    libavformat   52.31. 1 / 52.31. 1
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Mar 15 2009 18:16:31, gcc: 4.3.0 20080305 (alpha-testing) mingw-20080
  
  502
  
  [dv @ 0x1449690]Can't determine profile of DV input stream.
  
  C:\\Music\\song1.mp3: Error while opening file

  I also tried removing the double back slashes from the command but got the same error.