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• wasm/hevc : Add sao_band_filter

  7 juin, par Zhao Zhili

  wasm/hevc : Add sao_band_filter
  hevc_sao_band_8_8_c :                                    63.0 ( 1.00x)
  
  hevc_sao_band_8_8_simd128 :                              10.4 ( 6.06x)
  
  hevc_sao_band_16_8_c :                                  230.4 ( 1.00x)
  
  hevc_sao_band_16_8_simd128 :                             22.9 (10.07x)
  
  hevc_sao_band_32_8_c :                                  900.4 ( 1.00x)
  
  hevc_sao_band_32_8_simd128 :                             81.5 (11.05x)
  
  hevc_sao_band_48_8_c :                                 2009.1 ( 1.00x)
  
  hevc_sao_band_48_8_simd128 :                            170.2 (11.80x)
  
  hevc_sao_band_64_8_c :                                 3535.0 ( 1.00x)
  
  hevc_sao_band_64_8_simd128 :                            297.5 (11.88x)
  Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
  

  • [DH] libavcodec/wasm/hevc/Makefile
  • [DH] libavcodec/wasm/hevc/dsp_init.c
  • [DH] libavcodec/wasm/hevc/sao.c
  • [DH] libavcodec/wasm/hevc/sao.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 ?

  


• configure : drop yasm support

  3 octobre 2024, par Lynne

  configure : drop yasm support
  We started defauling to nasm 8 years ago.
  
  We are still compatible with yasm 0.8.0, released in 2009. **15 years ago**.
  
  The time has more than come to remove support for it.
  Maintaining compatibility started cutting into writing new code long ago.
  
  We still can't have 2-argument instructions, preprocessor booleans, and all
  
  AVX2 code must still be wrapped in ifdefs. Newly added code often breaks this.
  

  • [DH] Changelog
  • [DH] configure
  • [DH] doc/developer.texi
  • [DH] doc/optimization.txt
  • [DH] doc/platform.texi