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• FFMPEG Video loop from images files

  27 février 2020, par Nesan Mano

  I am trying to make a video from a bundle of image files and then apply a an overlay on top of it.Another requirement is to make the video loop 3x. It is simply not working.

  The first three paths are pointing toward the same image bundle. (A folder containing images like the following DSC0001_0013.jpg,DSC0002_0013.jpg,etc)

  Observed symptoms :

  The script runs infinitely.I produces a video file of 0 KB.I have to abort script using CTRL+C

  This is my script.

  ffmpeg 
  
  -start_number 1 -framerate 3/1 
  
  -i "C:\Users\xxx\AppData\Local\xxx\xxx\xxx\xxx\xxx\xxx\xxx\963d9d9b8e1\DSC%04d_0013.jpg"
  
  
  
  -i "C:\Users\xxx\AppData\Local\xxx\xxx\projects\xxx\xxx\xxx\xxx\963d9d9b8e1\DSC%04d_0013.jpg"
  
  
  
  -i "C:\Users\xxx\AppData\Local\xxx\xxx\projects\xxx\xxx\xxx\xxx\963d9d9b8e1\DSC%04d_0013.jpg"
  
  
  
  -i "C:\Users\xxx\AppData\Local\xxx\xxx\projects\1237\1138\overlay.png" 
  
  -i "C:\Users\xxx\AppData\Local\xxx\xxx\projects\1237\1138\overlay.png" 
  
  -i "C:\Users\xxx\AppData\Local\xxx\xxx\projects\1237\1138\overlay.png" 
  
  -filter_complex " [0:v]scale=600x900[scaled1]; [1:v]scale=600x900[scaled2]; [2:v]scale=600x900[scaled3]; [scaled1][3:v]overlay[tmp1]; [scaled2][4:v]overlay[tmp2]; [scaled3][5:v]overlay[tmp3]; [tmp1][tmp2][tmp3]concat=n=3[scaled] "
  
  -map [scaled] -r 10 -vcodec libx264  -pix_fmt yuv420p -crf 23  "C:\Users\xxx\Documents\Projets\2020\xxx\video test ffmpeg\test.mp4"

• swscale/x86/rgb2rgb : optimize AVX2 version of uyvytoyuv422

  20 février, par Shreesh Adiga

  swscale/x86/rgb2rgb : optimize AVX2 version of uyvytoyuv422
  Currently the AVX2 version of uyvytoyuv422 in the SIMD loop does the following :
  
  4 vinsertq to have interleaving of the vector lanes during load from memory.
  
  4 vperm2i128 inside 4 RSHIFT_COPY calls to achieve the desired layout.
  This patch replaces the above 8 instructions with 2 vpermq and
  
  2 vpermd with a vector register similar to AVX512ICL version.
  Observed the following numbers on various microarchitectures :
  On AMD Zen3 laptop :
  
  Before :
  
  uyvytoyuv422_c :                                      51979.7 ( 1.00x)
  
  uyvytoyuv422_sse2 :                                    5410.5 ( 9.61x)
  
  uyvytoyuv422_avx :                                     4642.7 (11.20x)
  
  uyvytoyuv422_avx2 :                                    4249.0 (12.23x)
  After :
  
  uyvytoyuv422_c :                                      51659.8 ( 1.00x)
  
  uyvytoyuv422_sse2 :                                    5420.8 ( 9.53x)
  
  uyvytoyuv422_avx :                                     4651.2 (11.11x)
  
  uyvytoyuv422_avx2 :                                    3953.8 (13.07x)
  On Intel Macbook Pro 2019 :
  
  Before :
  
  uyvytoyuv422_c :                                     185014.4 ( 1.00x)
  
  uyvytoyuv422_sse2 :                                   22800.4 ( 8.11x)
  
  uyvytoyuv422_avx :                                    19796.9 ( 9.35x)
  
  uyvytoyuv422_avx2 :                                   13141.9 (14.08x)
  After :
  
  uyvytoyuv422_c :                                     185093.4 ( 1.00x)
  
  uyvytoyuv422_sse2 :                                   22795.4 ( 8.12x)
  
  uyvytoyuv422_avx :                                    19791.9 ( 9.35x)
  
  uyvytoyuv422_avx2 :                                   12043.1 (15.37x)
  On AMD Zen4 desktop :
  
  Before :
  
  uyvytoyuv422_c :                                      29105.0 ( 1.00x)
  
  uyvytoyuv422_sse2 :                                    3888.0 ( 7.49x)
  
  uyvytoyuv422_avx :                                     3374.2 ( 8.63x)
  
  uyvytoyuv422_avx2 :                                    2649.8 (10.98x)
  
  uyvytoyuv422_avx512icl :                               1615.0 (18.02x)
  After :
  
  uyvytoyuv422_c :                                      29093.4 ( 1.00x)
  
  uyvytoyuv422_sse2 :                                    3874.4 ( 7.51x)
  
  uyvytoyuv422_avx :                                     3371.6 ( 8.63x)
  
  uyvytoyuv422_avx2 :                                    2174.6 (13.38x)
  
  uyvytoyuv422_avx512icl :                               1625.1 (17.90x)
  Signed-off-by : Shreesh Adiga <16567adigashreesh@gmail.com>
  

  • [DH] libswscale/x86/rgb_2_rgb.asm

• checkasm : Remove unnecessary const on scalar parameters

  15 décembre 2023, par Martin Storsjö

  checkasm : Remove unnecessary const on scalar parameters
  The ffmpeg coding style doesn't usually use const on scalar
  
  parameters (or on the pointer values - as opposed to the type
  
  that is pointed to, where it has a semantic meaning), contrary
  
  to the dav1d coding style (where this was imported from).
  This avoids warnings about differences in the type signatures
  
  between declaration and definition of this function, with older
  
  versions of MSVC.
  The issue was observed with one version of MSVC 2017,
  
  19.16.27024.1, with warnings like these :
      src/tests/checkasm/checkasm.c(969) : warning C4028 : formal parameter 3 different from declaration
  The warning itself is bogus as the const here is harmless, and
  
  newer versions of MSVC no longer warn about this.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] tests/checkasm/checkasm.c
  • [DH] tests/checkasm/checkasm.h