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• 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 !!

• Unable to find a suitable output format while cutting video

  22 juillet 2018, par Java Android

  I am using below command to cut video-

  String complexCommand = new String[]{"-y", "-i", yourRealPath, "-ss", "" + startMs / 1000, "-t", "" + (endMs - startMs) / 1000, "-c", "copy", filePath};

  I got below error -

  "ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers\n
  built with gcc 4.8 (GCC)\n configuration : —target-os=linux
  —cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi-
  —arch=arm —cpu=cortex-a8 —enable-runtime-cpudetect —sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot
  —enable-pic —enable-libx264 —enable-libass —enable-libfreetype —enable-libfribidi —enable-libmp3lame —enable-fontconfig —enable-pthreads —disable-debug —disable-ffserver —enable-version3 —enable-hardcoded-tables —disable-ffplay —disable-ffprobe —enable-gpl —enable-yasm —disable-doc —disable-shared —enable-static —pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config —prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a —extra-cflags=’-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include
  -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all’ —extra-ldflags=’-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib
  -Wl,-z,relro -Wl,-z,now -pie’ —extra-libs=’-lpng -lexpat -lm’ —extra-cxxflags=\n libavutil 55. 17.103 / 55. 17.103\n libavcodec 57. 24.102 / 57. 24.102\n libavformat 57. 25.100 /
  57. 25.100\n libavdevice 57. 0.101 / 57. 0.101\n libavfilter 6. 31.100 / 6. 31.100\n libswscale 4. 0.100 / 4. 0.100\n libswresample 2. 0.101 / 2. 0.101\n libpostproc 54. 0.100 /
  54. 0.100\nInput #0, mov,mp4,m4a,3gp,3g2,mj2, from ’/storage/emulated/0/Download/file3gpp.3gpp’ :\n Metadata :\n
  major_brand : 3gp4\n minor_version : 0\n
  compatible_brands : isom3gp4\n creation_time : 2018-04-09
  12:04:29\n com.android.version : 7.1.1\n Duration : 00:00:04.88,
  start : 0.000000, bitrate : 1425 kb/s\n Stream #0:0(eng) : Audio : aac
  (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 96 kb/s (default)\n
  Metadata :\n creation_time : 2018-04-09 12:04:29\n
  handler_name : SoundHandle\n[NULL @ 0xf622a600] Unable to find a
  suitable output format for
  ’/storage/emulated/0/Movies/cut_video.3gpp’\n/storage/emulated/0/Movies/cut_video.3gpp :
  Invalid argument\n"

  Why am i getting this error and how can i resolve it ?