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• 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

• Convert a video file to an image sequence of equal length ?

  1er mars 2017, par Jeremy

  How using FFMPEG do I convert a video file to a sequence of images that is equal in duration/frames to the original video file ?

  I’m trying to import video into the non comercial version of Nuke on Linux which refuses to accept h.264 and doesn’t have handy a list of accepted codecs that I can find...but plays nice with images sequences...but I can’t get the sound to line up with the image sequence.

  I tried getting a look at the framerate with :

  ffprobe -v 0 -of compact=p=0 -select_streams 0 -show_entries stream=r_frame_rate Forest.mp4 

  which returns :

  r_frame_rate=30/1

  and then I run

  ffmpeg -i Forest.mp4 -r 30/1 forest/jpegs%06d.jpg