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• Problems with ffmpeg cross-compilation for windows x64 using linux/mingw

  3 mai 2023, par Adam

  I'm cross-compiling ffmpeg with NVIDIA hw acceleration for windows 64 with ubuntu/mingw.
The configuration/make process is OK but dumpbin shows that avfilter-9.dll file tries to import some kernel functions twice - from kernel32 which is correct and second time from... npp dlls !

  


  dumpbin /imports avfilter-9.dll
:
    nppig64_12.dll
             180587CC8 Import Address Table
             180587148 Import Name Table
                     0 time date stamp
                     0 Index of first forwarder reference

                         154 nppiRotate_8u_C1R
                         100 nppiResizeSqrPixel_8u_C1R
                           1 AcquireSRWLockExclusive
                         11B DeleteCriticalSection
                         13F EnterCriticalSection
                         228 GetCurrentProcess
                         229 GetCurrentProcessId
                         22D GetCurrentThreadId
                         276 GetLastError
:
   KERNEL32.dll
             180587CD8 Import Address Table
             180587158 Import Name Table
                     0 time date stamp
                     0 Index of first forwarder reference

                           1 AcquireSRWLockExclusive
                         11B DeleteCriticalSection
                         13F EnterCriticalSection
                         228 GetCurrentProcess
                         229 GetCurrentProcessId
                         22D GetCurrentThreadId
                         276 GetLastError
                         301 GetSystemTimeAsFileTime
                         31F GetTickCount
                         375 InitOnceBeginInitialize


  


  My ./configure :

  


  sudo PKG_CONFIG_PATH=/usr/local/lib/pkgconfig/ ./configure --arch=x86_64 --target-os=mingw64 --cross-prefix=x86_64-w64-mingw32- --enable-nonfree --enable-cuda-nvcc --enable-nvenc --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64 --extra-cflags=-I../npp_dev/include/ --extra-ldflags=-L../npp_dev/lib/x64/ --disable-static --enable-shared


  


  /npp_dev contains include/lib files for npp (windows 64).

  


  Anybody encountered similar issue or has any idea what I should start looking at ?

  


  Important note - without —enable-libnpp the avfilter-9.dll is correctly generated.

  


  Thanks ! //Adam

  


• FFMPEG Crash in Windows when trying to create chroma key for image

  24 février 2018, par Kavinda Keshan Rasnayake

  I tried to execute this command in Windows 10 for ffmpeg to create a chroma key :

  ffmpeg -i input.png -vf colorkey=green out.png

  However, using this command crashes ffmpeg.

  What can I do to mitigate this problem ?

  I am using ffmpeg 3.4

  edit : - Here is what is displayed on console

  ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, png_pipe, from '.\e2.png':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: png, rgba(pc), 480x480, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, image2, to 'out.png':
  
    Metadata:
  
      encoder         : Lavf57.83.100
  
      Stream #0:0: Video: png, rgba, 480x480, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.107.100 png

• Changing gamma_r & g in video filter eq (ffmpeg) causes decrease in vmaf score ?

  14 août 2019, par Billo Binder

  I am using ffmpeg video filter

  -vf eq=contrast=1.1:brightness=0:saturation=1:gamma=1:gamma_r=0.99:gamma_g=0.98:gamma_b=1.1

  to reduce red & green colors in a video. But this causes reduction in vmaf scores but increase in ssim scores and I don’t understand why ?

  Original Scores :

  • aggregateVMAF="98.0557"
  • aggregateSSIM="0.977389"
  • aggregateMS_SSIM="0.982315"
  • poolMethod="mean".

  Modified scores :

  • aggregateVMAF="87.0124"
  • aggregateSSIM="0.991839"
  • aggregateMS_SSIM="0.984841"
  • poolMethod="mean".

  Also eq=contrast=1.1 causes boost in vmaf score.

  How do i interpret this...i mean can i ignore change in vmaf as ssim is high ?

  Original Score i got using video filter at default :

  -vf eq=contrast=1.1:brightness=0:saturation=1:gamma=1:gamma_r=1:gamma_g=1:gamma_b=1

  Other Details :

  Distorted 720p video was upscaled using :

  ffmpeg -i dist.mkv -map 0:0 -map 0:1 -vf scale=1920x1080:flags=lanczos -c:v h264_nvenc -preset lossless -profile:v high -level 4.1 -crf 0 -c:a copy output_1080p.mkv

  i mean can i discard low vmaf score & finalize the encode because ssim is high ot there is some other filter which will not hamper vmaf score and reduce greenish effect ?