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• Canopus HQ/HQA decoder

  9 avril 2015, par Vittorio Giovara

  Canopus HQ/HQA decoder
  Based on work by Kostya Shishkov <kostya.shishkov@gmail.com>.
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DBH] Changelog
  • [DBH] doc/general.texi
  • [DBH] libavcodec/Makefile
  • [DBH] libavcodec/allcodecs.c
  • [DBH] libavcodec/avcodec.h
  • [DBH] libavcodec/codec_desc.c
  • [DBH] libavcodec/hq_hqa.c
  • [DBH] libavcodec/hq_hqa.h
  • [DBH] libavcodec/hq_hqadata.c
  • [DBH] libavcodec/hq_hqadsp.c
  • [DBH] libavcodec/hq_hqadsp.h
  • [DBH] libavcodec/version.h
  • [DBH] libavformat/riff.c
  • [DBH] tests/fate/video.mak
  • [DBH] tests/ref/fate/canopus-hq_hqa-hq
  • [DBH] tests/ref/fate/canopus-hq_hqa-hqa
  • [DBH] tests/ref/fate/canopus-hq_hqa-inter

• 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.

• ffmpeg rotate overlay image background transparent on video [closed]

  5 mai 2021, par Abhi Panchal

  'ffmpeg -y -i video.mp4 -i bells_sticker.png -filter_complex "[1:v]rotate='90*PI/180:c=black@0'[rotate] ;[rotate]scale=238:238[b] ;[0][b] overlay=100:50:enable='between(t,0,20)'" -codec:a copy StickerWithVideo.mp4'

  


  I get black background behind the input image

  


  try also this for remove background

  


  c=0x00000000
c=none

  


  Outout

  


  Original Sticker Image

  


  i'm say thanks in advance