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• ffmpeg - converting pngs with white background to movie give black background

  14 octobre 2015, par Population Xplosive

  I have a list of files with their names in the form [1-1000].00.png.
  All these are flattened images (graphs) with white background color.
  I am trying to make a movie out of these files using ffmpeg. However, when I use ffmpeg, everything white in the images become black in the movie. And everything black remains the same. The command I used is :

  The command I use is :

  ffmpeg -pix_fmt yuv420p -r 8 -f image2 -pattern_type glob -i
  ’*.00.png’ movie.mp4

• Ubuntu 14 FFMPEG & Black and White Conversion

  3 septembre 2015, par Jesse James Richard

  As the HUE option doesn’t exist in FFMPEG on Ubuntu because it’s AVCONC, can it just be assumed that it’s nearly impossible to convert a video to black and white since FFMPEG is effectively incomplete ?

• Converting png images series to webm with transparent white background from Daz3d

  25 août 2015, par James

  I’m trying to make a webm video with a transparent background from a Daz3D model.
  My process is export png image series with transparent background from Daz3D, use ffmpeg to convert png series to webm video.
  This was working well in Daz3D 4.6.

  But in Daz3D 4.8 the exported background is black instead of white, so when converted to webm is ok on Chrome as has the transparency, but on Firefox is black and has a halo (as Firefox does not support transparency so displays background).

  So I’m looking for a solution with Daz3D, or tools like ImageMagik.
  I almost got it with ImageMagik,

  convert -alpha extract *.png mask.png
  
  mogrify -flatten talk*.png
  
  for /f %x in ('dir /s /b blink*.png') do @composite -compose CopyOpacity mask-0.png %x %x

  But for some reason the final webm has a white background not transparent ...
  Some more info here,

  http://www.daz3d.com/forums/discussion/61237/daz3d-4-8-png-background-is-black

  and here,

  http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=28214

  >
  Doh, okay I figured it out. My images were good, but I somehow have two different versions of ffmpeg on my computer and was using the wrong one that doesn’t seem to support transparency.

  Now it is working.

  My only issue is the last shell line,

  for /f %x in (’dir /s /b blink*.png’) do @composite -compose CopyOpacity mask-0.png %x %x

  This only uses mask-0.png, instead of mask-1 for blink01.png, mask-2 for blink02.png etc.