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• A Digital Media Primer for Geeks

  24 septembre 2010, par noreply@blogger.com (John Luther)

  Our friend Monty Montgomery (creator of the Vorbis audio codec used in WebM) has started a video series about digital media. The first episode is an excellent overview of "the technical foundations of modern digital media."

  You can stream WebM versions of the video in your favorite WebM-enabled browser or download it to your desktop and watch it one of many WebM-enabled media players. Supported browsers and players are listed on our site.

  There’s also a companion Wiki.

  

• 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 ?

  


• lavc/vvc_mc : R-V V dmvr

  15 décembre 2024, par sunyuechi

  lavc/vvc_mc : R-V V dmvr
                                       k230               banana_f3
  
  dmvr_8_12x20_c :                       619.3 ( 1.00x)    624.1 ( 1.00x)
  
  dmvr_8_12x20_rvv_i32 :                 128.6 ( 4.82x)    103.4 ( 6.04x)
  
  dmvr_8_20x12_c :                       610.0 ( 1.00x)    665.6 ( 1.00x)
  
  dmvr_8_20x12_rvv_i32 :                 137.6 ( 4.44x)    92.9 ( 7.17x)
  
  dmvr_8_20x20_c :                      1008.0 ( 1.00x)    1082.7 ( 1.00x)
  
  dmvr_8_20x20_rvv_i32 :                 221.1 ( 4.56x)    155.4 ( 6.97x)
  
  dmvr_h_8_12x20_c :                    2008.0 ( 1.00x)    2009.7 ( 1.00x)
  
  dmvr_h_8_12x20_rvv_i32 :               239.6 ( 8.38x)    186.7 (10.77x)
  
  dmvr_h_8_20x12_c :                    1989.5 ( 1.00x)    2009.4 ( 1.00x)
  
  dmvr_h_8_20x12_rvv_i32 :               230.3 ( 8.64x)    155.4 (12.93x)
  
  dmvr_h_8_20x20_c :                    3304.1 ( 1.00x)    3342.9 ( 1.00x)
  
  dmvr_h_8_20x20_rvv_i32 :               378.3 ( 8.73x)    248.9 (13.43x)
  
  dmvr_hv_8_12x20_c :                   3609.8 ( 1.00x)    3603.4 ( 1.00x)
  
  dmvr_hv_8_12x20_rvv_i32 :              369.1 ( 9.78x)    322.1 (11.19x)
  
  dmvr_hv_8_20x12_c :                   3628.3 ( 1.00x)    3624.2 ( 1.00x)
  
  dmvr_hv_8_20x12_rvv_i32 :              322.8 (11.24x)    238.7 (15.19x)
  
  dmvr_hv_8_20x20_c :                   5933.8 ( 1.00x)    5936.6 ( 1.00x)
  
  dmvr_hv_8_20x20_rvv_i32 :              526.5 (11.27x)    374.1 (15.87x)
  
  dmvr_v_8_12x20_c :                    2156.3 ( 1.00x)    2155.4 ( 1.00x)
  
  dmvr_v_8_12x20_rvv_i32 :               239.6 ( 9.00x)    176.2 (12.24x)
  
  dmvr_v_8_20x12_c :                    2137.6 ( 1.00x)    2165.9 ( 1.00x)
  
  dmvr_v_8_20x12_rvv_i32 :               230.3 ( 9.28x)    155.2 (13.96x)
  
  dmvr_v_8_20x20_c :                    4183.8 ( 1.00x)    3592.9 ( 1.00x)
  
  dmvr_v_8_20x20_rvv_i32 :               369.3 (11.33x)    249.2 (14.42x)
  

  • [DH] libavcodec/riscv/vvc/vvc_mc_rvv.S
  • [DH] libavcodec/riscv/vvc/vvcdsp_init.c