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• Can not open video in OpenCV and all solution on stacjoverflow is not working with me

  19 mai 2017, par Abeer Yosef

  I am trying to open video in openCV but it is not working i found solutions by adding full path i.e "D :/Folder1/Folder2/1.avi", converting video to .avi instead of mp4, copy the dll file from open cv to python folder after changing it is name by opencv version and windows 64 bit ffmpeg opencv_ffmpeg320_64.dll
  my opencv version 3.2.0
  windows 64
  python2.7 and Anaconda2

  I am beginner in Python and unfortunately nothing of the above solved my problem.

  below my code snappit

  import numpy as np

  import cv2

  cap = cv2.VideoCapture(’1.avi’)
  if cap.isOpened() :
  print "opend"
  else :
  print "not opend"

  while(cap.isOpened()) :
  ret, frame = cap.read()

  gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
  
  
  
  cv2.imshow('frame',gray)
  
  if cv2.waitKey(1) & 0xFF == ord('q'):
  
      break

  cap.release()
  cv2.destroyAllWindows()

• Avisynth total frames does not equal VirtualDub total frames

  7 mai 2017, par Corpuscular

  It appears that Dissolve and/or Fade change the total number of frames in .avs scripts. When I add up the total number of frames in the avs script and then load the avs script in Vdub the total number of frames is different. My real world example below shows a difference of 822 frames vs 1368 frames for the same script. I have run some basic tests which appear to support this hypothesis. Of course I may be doing something stupid. Any guidance would be greatly appreciated. Please let me know if I can clarify anything. Ffmpeg also borks on the same script which leads me to think this is an Avisynth issue. Or my lack of avs coding skills.

  System specs :
  Win7,
  FFmpeg version : 20170223-dcd3418 win32 shared,
  AVISynth version : 2.6

  Test1.avs = 200 frames long = Expected behaviour

  LoadPlugin("C:\Program Files (x86)\AviSynth 2.5\plugins\VSFilter.dll")
  
  v1=ImageReader("1.png", fps=24, start=1, end=100)
  
  v2=ImageReader("2.png", fps=24, start=1, end=100)
  
  video = v1 + v2
  
  return video

  Test2.avs with return Dissolve = 195 frames long = Unexpected behaviour

  LoadPlugin("C:\Program Files (x86)\AviSynth 2.5\plugins\VSFilter.dll")
  
  v1=ImageReader("1.png", fps=24, start=1, end=100)
  
  v2=ImageReader("2.png", fps=24, start=1, end=100)
  
  return Dissolve(v1, v2, 5)

  Test3.avs with fadeOut(fadeIn = 202 frames long = Unexpected behaviour

  LoadPlugin("C:\Program Files (x86)\AviSynth 2.5\plugins\VSFilter.dll")
  
  v1=ImageReader("1.png", fps=24, start=1, end=100)
  
  v2=ImageReader("2.png", fps=24, start=1, end=100)
  
  fadeOut(fadeIn(v1 + v2, 60), 60)

  Test4.avs with dissolve and fade = 197 frames long = Unexpected behaviour

  LoadPlugin("C:\Program Files (x86)\AviSynth 2.5\plugins\VSFilter.dll")
  
  v1=ImageReader("1.png", fps=24, start=1, end=100)
  
  v2=ImageReader("2.png", fps=24, start=1, end=100)
  
  v3 = Dissolve(v1, v2, 5)
  
  fadeOut(fadeIn(v3, 60), 60)

  Test5.avs explicity specifying frame rates on dissolve and fade = 197 frames = Unexpected behaviour

  LoadPlugin("C:\Program Files (x86)\AviSynth 2.5\plugins\VSFilter.dll")
  
  v1=ImageReader("1.png", fps=24, start=1, end=100)
  
  v2=ImageReader("2.png", fps=24, start=1, end=100)
  
  v3 = Dissolve(v1, v2, 5, 24)
  
  fadeOut(fadeIn(v3, 60, $000000, 24), 60, $000000, 24)

  realExample = 822 frames long = Expected behaviour (this is what I want)

  LoadPlugin("C:\Program Files (x86)\AviSynth 2.5\plugins\VSFilter.dll")
  
  v1=ImageReader("1.png", fps=24).trim(1,106)
  
  v3=ImageReader("3.png", fps=24).trim(1,471)
  
  v9=ImageReader("9.png", fps=24).trim(1,58)
  
  v10=ImageReader("10.png", fps=24).trim(1,35)
  
  v11=ImageReader("11.png", fps=24).trim(1,152)
  
  video = v1 + v3 + v9 + v10 + v11
  
  return video

  realExample = 1368 frames long

  LoadPlugin("C:\Program Files (x86)\AviSynth 2.5\plugins\VSFilter.dll")
  
  v1=ImageReader("1.png", fps=24).trim(1,106)
  
  v3=ImageReader("3.png", fps=24).trim(1,471)
  
  v9=ImageReader("9.png", fps=24).trim(1,58)
  
  v10=ImageReader("10.png", fps=24).trim(1,35)
  
  v11=ImageReader("11.png", fps=24).trim(1,152)
  
  d1 = Dissolve(v1, v3, 5)
  
  d3 = Dissolve(v3, v9, 5)
  
  d9 = Dissolve(v9, v10, 5)
  
  d10 = Dissolve(v10, v11, 5)
  
  fadeOut(fadeIn(d1 + d3 + d9 + d10,60),60)

• libavutil : Make LOCAL_ALIGNED(xx be equal to LOCAL_ALIGNED_xx(

  29 mars 2017, par Martin Storsjö

  libavutil : Make LOCAL_ALIGNED(xx be equal to LOCAL_ALIGNED_xx(
  Previously, the former form always produced a manually aligned,
  
  padded buffer, while the latter can use DECLARE_ALIGNED, if that
  
  amount of stack alignment is supported.
  libavutil/internal.h needs to include mem.h, since it uses
  
  the DECLARE_ALIGNED macro.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavutil/internal.h