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• avformat/movenc : handle EAC-3 extension bits for Atmos

  3 juin, par nyanmisaka

  avformat/movenc : handle EAC-3 extension bits for Atmos
  Based on a patch by nyanmisaka.
  
  Fixes commit #9996.
  Reviewed-by : Baptiste Coudurier <baptiste.coudurier@gmail.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/movenc.c
  • [DH] libavformat/version.h

• How to implement spring animation (mass, tension, friction) in FFmpeg zoompan filter instead of linear interpolation ?

  29 mai, par Mykyta Manuilenko

  I'm trying to create a zoom-in and zoom-out animation using FFmpeg's zoompan filter, but I want to replace the linear interpolation with a spring animation that uses physics parameters (mass, tension, friction).

  


  My input parameters :

  


  "zoompan": {
  "focusRect": {
    "x": 1086.36,
    "y": 641.87,
    "width": 613,
    "height": 345
  },            
  "easing": {
    "mass": 1,
    "tension": 120,
    "friction": 20
  }
}


  


  Current working linear animation :

  


  ffmpeg -framerate 25 -loop 1 -i input.png \
  -filter_complex "\
    [0:v]scale=6010:3380,setsar=1,split=3[zoomin_input][hold_input][zoomout_input]; \
    [zoomin_input]zoompan= \
      z='iw/(iw/zoom + (ow - iw)/duration)': \
      x='x + (3400 - 0)/duration': \
      y='y + (2009 - 0)/duration': \
      d=25:fps=25:s=1920x1080, \
      trim=duration=1,setpts=PTS-STARTPTS[zoomin]; \
    [hold_input]crop=1920:1080:3400:2009,trim=duration=4,setpts=PTS-STARTPTS[hold]; \
    [zoomout_input]zoompan=\
      zoom='if(eq(on,0),iw/ow,iw/(iw/zoom + (iw-ow)/duration))':\
      x='if(eq(on,0),3400,x + (0-3400)/duration)':\
      y='if(eq(on,0),2009,y + (0-2009)/duration)':\
      d=25:fps=25:s=1920x1080, \
      trim=duration=1,setpts=PTS-STARTPTS[zoomout];
    [zoomin][hold][zoomout]concat=n=3:v=1:a=0[outv]" \
  -map "[outv]" \
  -crf 23 \
  -preset medium \
  -c:v libx264 \
  -pix_fmt yuv420p \
  output.mp4


  


  Notes :

  


  


  • It creates a perfectly straight zoom path to the specific point on the screen (similar to pinch-zooming on a smartphone - straight zooming to the center of the focus rectangle)

    


  


  • To improve the quality of the output, I upscale it beforehand

    


  


  


  What I want to achieve :

  


  Instead of linear interpolation, I want to implement a spring function with these physics parameters :

  


  

  • mass : 1

  


  • tension : 120

  


  • friction : 20

  


  


  Note that these params can be changed.

  


  Also, I want to preserve a perfectly straight zoom path to the specific point on the screen (similar to pinch-zooming on a smartphone).

  


  Question :

  


  How can I properly implement a spring animation function in FFmpeg's zoompan filter ?

  


• hwcontext_vulkan : disable descriptor buffer extension on Intel

  12 avril, par Lynne

  hwcontext_vulkan : disable descriptor buffer extension on Intel
  Temporary workaround. Will be replaced with a version check once a fix is
  
  in the works and a known next version for Mesa with a fix is known.
  

  • [DH] libavutil/hwcontext_vulkan.c