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• ffmpeg - How to antialias webp/gif

  19 août 2019, par theParanoidAndroid

  I am trying to use ffmpeg to produce an animated GIF/WEBP from a set of pngs. However, the output images have jagged edges that I would like to smooth out somehow.

  The set of PNGs are of a rotating sphere, outputted from Blender. Here is one of the images (cropped to the edge to hide a company logo)

  

  However, when using the following commands :

  ffmpeg -i frames/%%4d.png -vf palettegen -y palette.png
  
  ffmpeg -v warning -i frames/%%4d.png -i palette.png -lavfi "paletteuse,setpts=PTS" -y out.gif
  
  ffmpeg -v warning -i frames/%%4d.png -y out.webp

  to generate .gif and .webp animations, the edges becomes jagged :

  

  I can’t convert to .mkv and back or something, as transparency has to be preserved.

  Can anyone help ?

• avfilter/asrc_sinc : Use av_bessel_i0()

  22 mai 2023, par Michael Niedermayer

  avfilter/asrc_sinc : Use av_bessel_i0()
  The new function is much more precise
  
  For default beta it is slightly slower, but its speed is already at the
  
  worst case in that comparison
  
  while the replaced function becomes much slower for larger beta
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavfilter/asrc_sinc.c

• How to open MIL avi video fiile

  12 février 2017, par ahme0307

  I have some (AVI) videos with MIL(Matrox Imaging Library) codec. I have tried multiple codecs but i am not able to open.
  I have tried VLC, K-lite codecs,ffmpeg, here is the log file from k-Lite

  >##LAV Splitter Source (internal)::Video
  
  >
  
  >Media Type 0:
  
  >--------------------------
  
  >Video: MIL  256x256 5fps 489kbps
  
  >AM_MEDIA_TYPE: 
  
  >majortype: MEDIATYPE_Video {73646976-0000-0010-8000-00AA00389B71}
  
  >subtype: Unknown GUID Name {204C494D-0000-0010-8000-00AA00389B71}
  
  >formattype: FORMAT_VideoInfo {05589F80-C356-11CE-BF01-00AA0055595A}
  
  >bFixedSizeSamples: 0
  
  >bTemporalCompression: 1
  
  >lSampleSize: 1
  
  >cbFormat: 128
  
  >
  
  >VIDEOINFOHEADER:
  
  >rcSource: (0,0)-(256,256)
  
  >rcTarget: (0,0)-(256,256)
  
  >dwBitRate: 489508
  
  >dwBitErrorRate: 0
  
  >AvgTimePerFrame: 2000000
  
  >
  
  >BITMAPINFOHEADER:
  
  >biSize: 80
  
  >biWidth: 256
  
  >biHeight: 256
  
  >biPlanes: 1
  
  >biBitCount: 24
  
  >biCompression: MIL 
  
  >biSizeImage: 196608
  
  >biXPelsPerMeter: 0
  
  >biYPelsPerMeter: 0
  
  >biClrUsed: 0
  
  >biClrImportant: 0
  
  >
  
  >pbFormat:
  
  >
  
  >

  I also tried ffplay and here is the output
  

  The only software i came across that can open this video is from Matrox and it doesn’t allow exporting to other formats
  
  I appreciate if some one can direct me to codecs that can handle this videos. I would like convert to other video formats for further processing.