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• OpenCV-Python installation (missing ffmpeg) - Windows

  8 octobre 2017, par FZNB

  I managed to install OpenCV 3.1 using conda and Python 3.5 and everything seems to work fine.

  However, when trying to import a video file via ffmpeg I get this :

  import numpy as np
  
  import cv2
  
  
  
  cap = cv2.VideoCapture('data\vtest.avi')
  
  cap.read()
  
  
  
  #(False, None)

  When using still images or my laptop webcam it works (notice that the VideCapture returns None). Obviously, something is wrong with ffmpeg.

  I have tried a couple of things :

  1. Install ffmpeg binaries in my environment/PATH (works fine separately
     but apparently OpenCV cannot call it since it looks for specific dlls).

  2. Move to the bin folder (which is in my path as well) the
     dlls from the compiled version in
     sourceforge :

     opencv_ffmpeg310_64.dll

     opencv_ffmpeg310.dll

  Neither of the two options worked. Any ideas ?

• Ffmpeg framework android

  2 juin 2017, par Yupi

  I have been working on one project in which ffmpeg collection of libraries has to be included. But I’m struggling to implement it in Android Studio. I can’t find clear explanation for that. Most of the explanations are for Linux or Mac OS but I’m using Windows. I have followed couple explanations which says that new directory has to be created in order : jniLibs/armeabi/ffmpeg.so I have done all of that. All things that like general. When I load library :
  

  static {
       System.loadLibrary("ffmpeg");
   }

  I can’t get acces to native mehods like public static native int encodeVideoFrame(byte[] yuv_image);

  Warning says : Cannot resolve corresponding JNI function

  So problem is with compiling ffmpeg for Android using Windows and including it in Android Studio. Any help would be very appreciated. Thanks.

• FFMPEG image not updating

  4 juillet 2017, par Liam Martens

  THE INPUT FILES

  1. An overlay image that has is being updated every 5 seconds by a Python script
  2. A small MP4 file that will be looped by a concat input
  3. An MP3 file as audio source

  THE COMMAND (UPDATED)

  This is the command I’m currently using to combine and stream the inputs.

  ffmpeg -re -i music.mp3 -f concat -i videoincludes.txt
  
  -r 1 -loop 1 -f image2 -i overlay.png
  
  -c:v libx264 -c:a aac -shortest -crf 23 -pix_fmt yuv420p
  
  -maxrate 2500k -bufsize 2500k -preset ultrafast -r 30 -g 60 -b:v 2000k -b:a 192k -ar 44100
  
  -filter_complex "[1:v][2:v] overlay=0:0" -map 0:a -strict -2
  
  -f flv rtmp://a.rtmp.youtube.com/live2/{key}

  Als tried using -framerate 1 instead of -r 1

  THE ISSUE

  So the issue is that the image doesn’t always update. Sometimes it does update every couple seconds at the start but it stops updating after 10-20 seconds without any difference in log output and sometimes it just doesn’t update.

  I can however confirm that the image is being updated by the Python script but FFmpeg is just not picking this up.

  I read setting the input format of the image to image2 should allow it to update so I am not sure what is wrong or what I can do to improve it.