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• webp : add a special case for a huffman table with only 1 symbol

  4 décembre 2013, par Justin Ruggles

  webp : add a special case for a huffman table with only 1 symbol
  The vlc reader cannot handle 0-bit huffman codes. For most
  
  situations WebP uses the "simple" huffman coding for this case,
  
  but that will only handle symbols up to 255. For the LZ77 distance
  
  codes, larger symbol values are needed, so it can happen in rare
  
  cases that a normal huffman table is used that only has a single
  
  symbol.
  

  • [DBH] libavcodec/webp.c

• FFMPEG inside conda shell , running c++

  20 novembre 2018, par albert1905

  I’m trying to run a c++ program that depends on ffmpeg library.
  Important to mention, I’m working on a distance computer, so I don’t have the entire permissions.
  So I created a conda shell, download ffmpeg-dev, so far so good.
  I’m trying to run the c++ I want and he doesn’t recognize the "libav*" libraries (which are part of ffmpeg).
  I read that the libraries suppose to sit in "/usr/include" (or soemthing like that), in order that

  # include <>

  will recognize the library, but I don’t have permissions to write to this directory, so I had to think about something else, so I copied all the libav directories from "anconda3/include" to my dir and manually changed all the #includes to the realpath.

  But now I’m getting this error :

  g++ mpegflow.cpp -o mpegflow -O3 -D__STDC_CONSTANT_MACROS -lswscale
  -lavdevice -lavformat -lavcodec -lswresample -lavutil -lpthread -lbz2 -lz -lc -lrt -Idependencies/include -Ldependencies/lib /nfs/iil/itools/em64t_SLES11/pkgs/gcc/4.7.2/.bin/../lib64/gcc/x86_64-suse-linux/4.7.2/../../../../x86_64-suse-linux/bin/ld :
  cannot find -lavdevice collect2 : error : ld returned 1 exit status
  make : *** [mpegflow] Error 1

  I understand the problem, But I have no Idea how to solve it.
  I’ll be happy for your help.
  Thanks.

• How to ensure plt.savefig saves multiple images instead of one ?

  18 mars 2018, par Natalie

  I’m trying to save images after for each iteration to show how my neural network is learning.

  for iterations in range(1,1000):
  
      model.fit(x_train, 
  
                y_train, 
  
                batch_size=20, 
  
                epochs=1, 
  
                verbose=2)
  
  
  
  predictions = model.predict(X)
  
  plt.plot(X,predictions,'o')
  
  plt.plot(r, morse(r,De,Re,alpha))
  
  plt.xlabel(r'$r$') # internuclear separation distance
  
  plt.ylabel(r'$V(r)$') # morse potential energy
  
  plt.savefig('myfig'+str(iterations))
  
  plt.clf()

  Originally, I was able to save every image, however, it now only saves the last iteration image only. I wondered how I might be able to solve this issue ?

  Also, related the first question : using the images I’m saving, I’m trying to merge all the images together into a quick movie to show the training process. I’ve been using ffmpeg (see image below for syntax error), but I keep getting syntax errors. Could anyone guide me through what I might be doing wrong ? ffmpeg syntax error I’m getting

  Thanks in advance for helping me out - completely new to machine learning but using it for a university project, so apologies for my lack of understanding/mistakes !!