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• Révision 17269 : attention : statut est un tableau dont chaque element est un tableau decrivant l...

  18 février 2011, par cedric -

  + utiliser la description venant de $boucle->show lors de la compilation

• matplotlib funcanimation save issue

  20 avril 2015, par Richie Abraham

  I have been trying some animation recently using matplotlib animations. It has been going great, i create an ffmpeg writer and save it as a video file. However i face an issue whenever the function that FuncAnimation calls returns more than one object.

  Below is a small snippet of my code base. When I return both im0 and im1, the video file created only has im1 , although the plt.show command works as expected ( showing both the videos ). If i return just a single im0, then it works as expected. IT also works as expected if i return both im0 and im1 with alpha=0.5.

  Can anyone shed some light on what is happening underneath the hood ?

  fig, ax = plt.subplots(1)
  
  def animate(i):
  
      im0=ax.imshow(np.ma.masked_array(imgl[i][:,:,0], mask=get_blob(i)),cmap='cubehelix')
  
  
  
      im1=ax.imshow(imgl[(i-100)%len(imgl)][:,:,0],cmap='cubehelix')
  
  
  
      return [im1,im0]
  
  
  
  
  
  
  
  ani = animation.FuncAnimation(fig, animate, frames=200,
  
                                interval=10, blit=True,repeat=False)
  
  ani.save('ps.mp4', writer=writer)
  
  plt.show()

• Did not locate the video track for seeking

  5 novembre 2018, par Bruce Young

  I using android MediaPlayer to play some audios.It’s works 100% fine with the method seekTo() in some format like m4a(ffmpeg show the media info below) :
  normal is the audio file name

  But when I use other format like matroska,webm,the seekTo()method always fail !(ffmpeg show the media info below)

  seekbad is the audio file name

  Okay,when the seekTo() fail the android studio console show some logs like this :

  11-05 11:07:00.815 763-22357/? E/MatroskaExtractor: Did not locate the video track for seeking

  Than I google the logs and find out the sourcecode in google git :
  https://android.googlesource.com/platform/frameworks/av/+/304ef91624e12661e7e35c2c0c235da84a73e9c0/media/libstagefright/matroska/MatroskaExtractor.cpp

  In MatroskaExtractor.cpp some code like this :

  // Always *search* based on the video track, but finalize based on mTrackNum
  
  if (!pTP) {
  
      ALOGE("Did not locate the video track for seeking");
  
      return;
  
  }

  I do not know why my media file ’Did not locate the video track for seeking’,Does anybody know it,Thanks a lot !